[ { "id": "authors:cdhpk-xte75", "collection": "authors", "collection_id": "cdhpk-xte75", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230602-251894000.48", "type": "article", "title": "An infrared transient from a star engulfing a planet", "author": [ { "family_name": "De", "given_name": "Kishalay", "orcid": "0000-0002-8989-0542", "clpid": "De-Kishalay" }, { "family_name": "Macleod", "given_name": "Morgan", "orcid": "0000-0002-1417-8024", "clpid": "Macleod-Morgan" }, { "family_name": "Karambelkar", "given_name": "Viraj", "orcid": "0000-0003-2758-159X", "clpid": "Karambelkar-Viraj-R" }, { "family_name": "Jencson", "given_name": "Jacob E.", "orcid": "0000-0001-5754-4007", "clpid": "Jencson-Jacob-E" }, { "family_name": "Chakrabarty", "given_name": "Deepto", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" }, { "family_name": "Conroy", "given_name": "Charlie", "orcid": "0000-0002-1590-8551", "clpid": "Conroy-Charlie" }, { "family_name": "Dekany", "given_name": "Richard", "orcid": "0000-0002-5884-7867", "clpid": "Dekany-Richard-G" }, { "family_name": "Eilers", "given_name": "Anna-Christina", "orcid": "0000-0003-2895-6218", "clpid": "Eilers-Anna-Christina" }, { "family_name": "Graham", "given_name": "Matthew J.", "orcid": "0000-0002-3168-0139", "clpid": "Graham-M-J" }, { "family_name": "Hillenbrand", "given_name": "Lynne A.", "clpid": "Hillenbrand-L-A" }, { "family_name": "Kara", "given_name": "Erin", "orcid": "0000-0003-0172-0854", "clpid": "Kara-Erin" }, { "family_name": "Kasliwal", "given_name": "Mansi M.", "orcid": "0000-0002-5619-4938", "clpid": "Kasliwal-M-M" }, { "family_name": "Kulkarni", "given_name": "S. R.", "orcid": "0000-0001-5390-8563", "clpid": "Kulkarni-S-R" }, { "family_name": "Lau", "given_name": "Ryan M.", "orcid": "0000-0003-0778-0321", "clpid": "Lau-Ryan-M" }, { "family_name": "Loeb", "given_name": "Abraham", "orcid": "0000-0003-4330-287X", "clpid": "Loeb-Abraham" }, { "family_name": "Masci", "given_name": "Frank J.", "orcid": "0000-0002-8532-9395", "clpid": "Masci-Frank-J" }, { "family_name": "Medford", "given_name": "Michael S.", "orcid": "0000-0002-7226-0659", "clpid": "Medford-Michael-S" }, { "family_name": "Meisner", "given_name": "Aaron M.", "orcid": "0000-0002-1125-7384", "clpid": "Meisner-Aaron-M" }, { "family_name": "Patel", "given_name": "Nimesh", "orcid": "0000-0002-6021-9421", "clpid": "Patel-Nimesh" }, { "family_name": "Quiroga-Nu\u00f1ez", "given_name": "Luis Henry", "orcid": "0000-0002-9390-955X", "clpid": "Quiroga-Nu\u00f1ez-Luis-Henry" }, { "family_name": "Riddle", "given_name": "Reed L.", "orcid": "0000-0002-0387-370X", "clpid": "Riddle-Reed-L" }, { "family_name": "Rusholme", "given_name": "Ben", "orcid": "0000-0001-7648-4142", "clpid": "Rusholme-Benjamin" }, { "family_name": "Simcoe", "given_name": "Robert A.", "orcid": "0000-0003-3769-9559", "clpid": "Simcoe-Robert-A" }, { "family_name": "Sjouwerman", "given_name": "Lor\u00e1nt O.", "orcid": "0000-0003-3096-3062", "clpid": "Sjouwerman-Lor\u00e1nt-O" }, { "family_name": "Teague", "given_name": "Richard", "orcid": "0000-0003-1534-5186", "clpid": "Teague-Richard" }, { "family_name": "Vanderburg", "given_name": "Andrew", "orcid": "0000-0001-7246-5438", "clpid": "Vanderburg-Andrew" } ], "abstract": "Planets with short orbital periods (roughly under 10\u2009days) are common around stars like the Sun. Stars expand as they evolve and thus we expect their close planetary companions to be engulfed, possibly powering luminous mass ejections from the host star. However, this phase has never been directly observed. Here we report observations of ZTF SLRN-2020, a short-lived optical outburst in the Galactic disk accompanied by bright and long-lived infrared emission. The resulting light curve and spectra share striking similarities with those of red novae\u2014a class of eruptions now confirmed to arise from mergers of binary stars. Its exceptionally low optical luminosity (approximately 1035\u2009erg\u2009s\u207b\u00b9) and radiated energy (approximately 6.5\u2009\u00d7\u200910\u2074\u00b9\u2009erg) point to the engulfment of a planet of fewer than roughly ten Jupiter masses by its Sun-like host star. We estimate the Galactic rate of such subluminous red novae to be roughly between\u20090.1 and several per year. Future Galactic plane surveys should routinely identify these, showing the demographics of planetary engulfment and the ultimate fate of planets in the inner Solar System.", "doi": "10.1038/s41586-023-05842-x", "issn": "0028-0836", "publisher": "Nature Publishing Group", "publication": "Nature", "publication_date": "2023-05-04", "series_number": "7959", "volume": "617", "issue": "7959", "pages": "55-60" }, { "id": "authors:dx9m0-w9t20", "collection": "authors", "collection_id": "dx9m0-w9t20", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20230105-896021000.58", "type": "article", "title": "A dense 0.1-solar-mass star in a 51-minute-orbital-period eclipsing binary", "author": [ { "family_name": "Burdge", "given_name": "Kevin B.", "orcid": "0000-0002-7226-836X", "clpid": "Burdge-Kevin-B" }, { "family_name": "El-Badry", "given_name": "Kareem", "orcid": "0000-0002-6871-1752", "clpid": "El-Badry-Kareem" }, { "family_name": "Marsh", "given_name": "Thomas R.", "orcid": "0000-0002-2498-7589", "clpid": "Marsh-Thomas-R" }, { "family_name": "Rappaport", "given_name": "Saul", "orcid": "0000-0003-3182-5569", "clpid": "Rappaport-Saul-A" }, { "family_name": "Brown", "given_name": "Warren R.", "orcid": "0000-0002-4462-2341", "clpid": "Brown-Warren-R" }, { "family_name": "Caiazzo", "given_name": "Ilaria", "orcid": "0000-0002-4770-5388", "clpid": "Caiazzo-Ilaria" }, { "family_name": "Chakrabarty", "given_name": "Deepto", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" }, { "family_name": "Dhillon", "given_name": "V. S.", "orcid": "0000-0003-4236-9642", "clpid": "Dhillon-Vik-S" }, { "family_name": "Fuller", "given_name": "Jim", "orcid": "0000-0002-4544-0750", "clpid": "Fuller-J" }, { "family_name": "G\u00e4nsicke", "given_name": "Boris T.", "orcid": "0000-0002-2761-3005", "clpid": "G\u00e4nsicke-B-T" }, { "family_name": "Graham", "given_name": "Matthew J.", "orcid": "0000-0002-3168-0139", "clpid": "Graham-M-J" }, { "family_name": "Kara", "given_name": "Erin", "orcid": "0000-0003-0172-0854", "clpid": "Kara-Erin" }, { "family_name": "Kulkarni", "given_name": "S. R.", "orcid": "0000-0001-5390-8563", "clpid": "Kulkarni-S-R" }, { "family_name": "Littlefair", "given_name": "S. P.", "orcid": "0000-0001-7221-855X", "clpid": "Littlefair-Stuart-P" }, { "family_name": "Mr\u00f3z", "given_name": "Przemek", "orcid": "0000-0001-7016-1692", "clpid": "Mr\u00f3z-Przemek" }, { "family_name": "Rodr\u00edguez-Gil", "given_name": "Pablo", "orcid": "0000-0002-4717-5102", "clpid": "Rodr\u00edguez-Gil-Pablo" }, { "family_name": "van Roestel", "given_name": "Jan", "orcid": "0000-0002-2626-2872", "clpid": "van-Roestel-Joannes" }, { "family_name": "Simcoe", "given_name": "Robert A.", "orcid": "0000-0003-3769-9559", "clpid": "Simcoe-Robert-A" }, { "family_name": "Bellm", "given_name": "Eric C.", "orcid": "0000-0001-8018-5348", "clpid": "Bellm-Eric-C" }, { "family_name": "Drake", "given_name": "Andrew J.", "clpid": "Drake-Andrew-J" }, { "family_name": "Dekany", "given_name": "Richard G.", "orcid": "0000-0002-5884-7867", "clpid": "Dekany-Richard-G" }, { "family_name": "Groom", "given_name": "Steven L.", "orcid": "0000-0001-5668-3507", "clpid": "Groom-Steven-L" }, { "family_name": "Laher", "given_name": "Russ R.", "orcid": "0000-0003-2451-5482", "clpid": "Laher-Russ-R" }, { "family_name": "Masci", "given_name": "Frank J.", "orcid": "0000-0002-8532-9395", "clpid": "Masci-Frank-J" }, { "family_name": "Riddle", "given_name": "Reed", "orcid": "0000-0002-0387-370X", "clpid": "Riddle-Reed-L" }, { "family_name": "Smith", "given_name": "Roger M.", "orcid": "0000-0001-7062-9726", "clpid": "Smith-R-M" }, { "family_name": "Prince", "given_name": "Thomas A.", "orcid": "0000-0002-8850-3627", "clpid": "Prince-T-A" } ], "abstract": "Of more than a thousand known cataclysmic variables (CVs), where a white dwarf is accreting from a hydrogen-rich star, only a dozen have orbital periods below 75 minutes. One way to achieve these short periods requires the donor star to have undergone substantial nuclear evolution before interacting with the white dwarf, and it is expected that these objects will transition to helium accretion. These transitional CVs have been proposed as progenitors of helium CVs. However, no known transitional CV is expected to reach an orbital period short enough to account for most of the helium CV population, leaving the role of this evolutionary pathway unclear. Here we report observations of ZTF\u2009J1813+4251, a 51-minute-orbital-period, fully eclipsing binary system consisting of a star with a temperature comparable to that of the Sun but a density 100 times greater owing to its helium-rich composition, accreting onto a white dwarf. Phase-resolved spectra, multi-band light curves and the broadband spectral energy distribution allow us to obtain precise and robust constraints on the masses, radii and temperatures of both components. Evolutionary modelling shows that ZTF\u2009J1813+4251 is destined to become a helium CV binary, reaching an orbital period under 20 minutes, rendering ZTF\u2009J1813+4251 a previously missing link between helium CV binaries and hydrogen-rich CVs.", "doi": "10.1038/s41586-022-05195-x", "issn": "0028-0836", "publisher": "Nature Publishing Group", "publication": "Nature", "publication_date": "2022-10-20", "series_number": "7932", "volume": "610", "issue": "7932", "pages": "467-471" }, { "id": "authors:1azpx-42142", "collection": "authors", "collection_id": "1azpx-42142", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220526-173308925", "type": "article", "title": "SRGA J181414.6-225604: A New Galactic Symbiotic X-Ray Binary Outburst Triggered by an Intense Mass-loss Episode of a Heavily Obscured Mira Variable", "author": [ { "family_name": "De", "given_name": "Kishalay", "orcid": "0000-0002-8989-0542", "clpid": "De-Kishalay" }, { "family_name": "Mereminskiy", "given_name": "Ilya", "orcid": "0000-0001-8931-1320", "clpid": "Mereminskiy-Ilya-A" }, { "family_name": "Soria", "given_name": "Roberto", "orcid": "0000-0002-4622-796X", "clpid": "Soria-Roberto" }, { "family_name": "Conroy", "given_name": "Charlie", "orcid": "0000-0002-1590-8551", "clpid": "Conroy-Charlie" }, { "family_name": "Kara", "given_name": "Erin", "orcid": "0000-0003-0172-0854", "clpid": "Kara-Erin" }, { "family_name": "Anand", "given_name": "Shreya", "orcid": "0000-0003-3768-7515", "clpid": "Anand-Shreya-G" }, { "family_name": "Ashley", "given_name": "Michael C. B.", "orcid": "0000-0003-1412-2028", "clpid": "Ashley-Michael-C-B" }, { "family_name": "Boyer", "given_name": "Martha L.", "orcid": "0000-0003-4850-9589", "clpid": "Boyer-Martha-L" }, { "family_name": "Chakrabarty", "given_name": "Deepto", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" }, { "family_name": "Grefenstette", "given_name": "Brian", "orcid": "0000-0002-1984-2932", "clpid": "Grefenstette-Brian-W" }, { "family_name": "Hankins", "given_name": "Matthew J.", "orcid": "0000-0001-9315-8437", "clpid": "Hankins-Matthew-J" }, { "family_name": "Hillenbrand", "given_name": "Lynne A.", "clpid": "Hillenbrand-L-A" }, { "family_name": "Jencson", "given_name": "Jacob E.", "orcid": "0000-0001-5754-4007", "clpid": "Jencson-Jacob-E" }, { "family_name": "Karambelkar", "given_name": "Viraj", "orcid": "0000-0003-2758-159X", "clpid": "Karambelkar-Viraj-R" }, { "family_name": "Kasliwal", "given_name": "Mansi M.", "orcid": "0000-0002-5619-4938", "clpid": "Kasliwal-M-M" }, { "family_name": "Lau", "given_name": "Ryan M.", "orcid": "0000-0003-0778-0321", "clpid": "Lau-Ryan-M" }, { "family_name": "Lutovinov", "given_name": "Alexander", "orcid": "0000-0002-6255-9972", "clpid": "Lutovinov-Alexander-A" }, { "family_name": "Moore", "given_name": "Anna M.", "orcid": "0000-0002-2894-6936", "clpid": "Moore-Anna-M" }, { "family_name": "Ng", "given_name": "Mason", "orcid": "0000-0002-0940-6563", "clpid": "Ng-Mason" }, { "family_name": "Panagiotou", "given_name": "Christos", "clpid": "Panagiotou-Christos" }, { "family_name": "Pasham", "given_name": "Dheeraj R.", "orcid": "0000-0003-1386-7861", "clpid": "Pasham-Dheeraj-R" }, { "family_name": "Semena", "given_name": "Andrey", "clpid": "Semena-Andrey-N" }, { "family_name": "Simcoe", "given_name": "Robert", "orcid": "0000-0003-3769-9559", "clpid": "Simcoe-Robert-A" }, { "family_name": "Soon", "given_name": "Jamie", "clpid": "Soon-Jamie" }, { "family_name": "Srinivasaragavan", "given_name": "Gokul P.", "clpid": "Srinivasaragavan-Gokul-P" }, { "family_name": "Travouillon", "given_name": "Tony", "orcid": "0000-0002-7279-3658", "clpid": "Travouillon-Tony-D" }, { "family_name": "Yao", "given_name": "Yuhan", "orcid": "0000-0001-6747-8509", "clpid": "Yao-Yuhan" } ], "abstract": "We present the discovery and multiwavelength characterization of SRGA J181414.6-225604, a Galactic hard X-ray transient discovered during the ongoing SRG/ART-XC sky survey. Using data from the Palomar Gattini-IR survey, we identify a spatially and temporally coincident variable infrared (IR) source, IRAS 18111-2257, and classify it as a very-late-type (M7\u2013M8), long-period (1502 \u00b1 24 days), and luminous (M_K \u2248 \u22129.9 \u00b1 0.2) O-rich Mira donor star located at a distance of \u224814.6^(+2.9)_(\u22122.3) kpc. Combining multicolor photometric data over the last \u224825 yr, we show that the IR counterpart underwent a recent (starting \u2248800 days before the X-ray flare) enhanced mass-loss (reaching \u22482.1 \u00d7 10\u207b\u2075 M_\u2299 yr\u207b\u00b9) episode, resulting in an expanding dust shell obscuring the underlying star. Multi-epoch follow-up observations from Swift, NICER, and NuSTAR reveal a \u2248200 day long X-ray outburst reaching a peak luminosity of L_\u2093 \u2248 2.5 \u00d7 10\u00b3\u2076 erg s\u207b\u00b9, characterized by a heavily absorbed (N_H \u2248 6 \u00d7 10\u00b2\u00b2 cm\u207b\u00b2) X-ray spectrum consistent with an optically thick Comptonized plasma. The X-ray spectral and timing behavior suggest the presence of clumpy wind accretion, together with a dense ionized nebula overabundant in silicate material surrounding the compact object. Together, we show that SRGA J181414.6-225604 is a new symbiotic X-ray binary in outburst, triggered by an intense dust-formation episode of a highly evolved donor. Our results offer the first direct confirmation for the speculated connection between enhanced late-stage donor mass loss and the active lifetimes of symbiotic X-ray binaries.", "doi": "10.3847/1538-4357/ac7c6e", "issn": "0004-637X", "publisher": "American Astronomical Society", "publication": "Astrophysical Journal", "publication_date": "2022-08-10", "series_number": "1", "volume": "935", "issue": "1", "pages": "Art. No. 36" }, { "id": "authors:4a5et-hdz13", "collection": "authors", "collection_id": "4a5et-hdz13", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220505-812251500", "type": "article", "title": "A 62-minute orbital period black widow binary in a wide hierarchical triple", "author": [ { "family_name": "Burdge", "given_name": "Kevin B.", "orcid": "0000-0002-7226-836X", "clpid": "Burdge-Kevin-B" }, { "family_name": "Marsh", "given_name": "Thomas R.", "orcid": "0000-0002-2498-7589", "clpid": "Marsh-Thomas-R" }, { "family_name": "Fuller", "given_name": "Jim", "orcid": "0000-0002-4544-0750", "clpid": "Fuller-J" }, { "family_name": "Bellm", "given_name": "Eric C.", "orcid": "0000-0001-8018-5348", "clpid": "Bellm-Eric-C" }, { "family_name": "Caiazzo", "given_name": "Ilaria", "orcid": "0000-0002-4770-5388", "clpid": "Caiazzo-Ilaria" }, { "family_name": "Chakrabarty", "given_name": "Deepto", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" }, { "family_name": "Coughlin", "given_name": "Michael W.", "orcid": "0000-0002-8262-2924", "clpid": "Coughlin-Michael-W" }, { "family_name": "De", "given_name": "Kishalay", "orcid": "0000-0002-8989-0542", "clpid": "De-Kishalay" }, { "family_name": "Dhillon", "given_name": "V. S.", "orcid": "0000-0003-4236-9642", "clpid": "Dhillon-Vik-S" }, { "family_name": "Graham", "given_name": "Matthew J.", "orcid": "0000-0002-3168-0139", "clpid": "Graham-M-J" }, { "family_name": "Rodr\u00edguez-Gil", "given_name": "Pablo", "orcid": "0000-0002-4717-5102", "clpid": "Rodr\u00edguez-Gil-Pablo" }, { "family_name": "Jaodand", "given_name": "Amruta D.", "orcid": "0000-0002-3850-6651", "clpid": "Jaodand-Amruta-D" }, { "family_name": "Kaplan", "given_name": "David L.", "orcid": "0000-0001-6295-2881", "clpid": "Kaplan-David-L" }, { "family_name": "Kara", "given_name": "Erin", "orcid": "0000-0003-0172-0854", "clpid": "Kara-Erin" }, { "family_name": "Kong", "given_name": "Albert K. H.", "orcid": "0000-0002-5105-344X", "clpid": "Kong-Albert-K-H" }, { "family_name": "Kulkarni", "given_name": "S. R.", "orcid": "0000-0001-5390-8563", "clpid": "Kulkarni-S-R" }, { "family_name": "Li", "given_name": "Kwan-Lok", "orcid": "0000-0001-8229-2024", "clpid": "Li-Kwan-Lok" }, { "family_name": "Littlefair", "given_name": "S. P.", "orcid": "0000-0001-7221-855X", "clpid": "Littlefair-Stuart-P" }, { "family_name": "Majid", "given_name": "Walid A.", "orcid": "0000-0002-4694-4221", "clpid": "Majid-Walid-A" }, { "family_name": "Mr\u00f3z", "given_name": "Przemek", "orcid": "0000-0001-7016-1692", "clpid": "Mr\u00f3z-Przemek" }, { "family_name": "Pearlman", "given_name": "Aaron B.", "orcid": "0000-0002-8912-0732", "clpid": "Pearlman-Aaron-B" }, { "family_name": "Phinney", "given_name": "E. S.", "orcid": "0000-0002-9656-4032", "clpid": "Phinney-E-S" }, { "family_name": "van Roestel", "given_name": "Jan", "orcid": "0000-0002-2626-2872", "clpid": "van-Roestel-Joannes" }, { "family_name": "Simcoe", "given_name": "Robert A.", "orcid": "0000-0003-3769-9559", "clpid": "Simcoe-Robert-A" }, { "family_name": "Andreoni", "given_name": "Igor", "orcid": "0000-0002-8977-1498", "clpid": "Andreoni-Igor" }, { "family_name": "Drake", "given_name": "Andrew J.", "clpid": "Drake-Andrew-J" }, { "family_name": "Dekany", "given_name": "Richard G.", "orcid": "0000-0002-5884-7867", "clpid": "Dekany-Richard-G" }, { "family_name": "Duev", "given_name": "Dmitry A.", "orcid": "0000-0001-5060-8733", "clpid": "Duev-Dmitry-A" }, { "family_name": "Kool", "given_name": "Erik C.", "orcid": "0000-0002-7252-3877", "clpid": "Kool-Erik-C" }, { "family_name": "Mahabal", "given_name": "Ashish A.", "orcid": "0000-0003-2242-0244", "clpid": "Mahabal-Ashish-A" }, { "family_name": "Medford", "given_name": "Michael S.", "orcid": "0000-0002-7226-0659", "clpid": "Medford-Michael-S" }, { "family_name": "Riddle", "given_name": "Reed", "orcid": "0000-0002-0387-370X", "clpid": "Riddle-Reed-L" }, { "family_name": "Prince", "given_name": "Thomas A.", "orcid": "0000-0002-8850-3627", "clpid": "Prince-T-A" } ], "abstract": "Over a dozen millisecond pulsars are ablating low-mass companions in close binary systems. In the original 'black widow', the eight-hour orbital period eclipsing pulsar PSR\u2009J1959+2048 (PSR\u2009B1957+20), high-energy emission originating from the pulsar is irradiating and may eventually destroy a low-mass companion. These systems are not only physical laboratories that reveal the interesting results of exposing a close companion star to the relativistic energy output of a pulsar, but are also believed to harbour some of the most massive neutron stars, allowing for robust tests of the neutron star equation of state. Here we report observations of ZTF\u2009J1406+1222, a wide hierarchical triple hosting a 62-minute orbital period black widow candidate, the optical flux of which varies by a factor of more than ten. ZTF\u2009J1406+1222 pushes the boundaries of evolutionary models, falling below the 80-minute minimum orbital period of hydrogen-rich systems. The wide tertiary companion is a rare low-metallicity cool subdwarf star, and the system has a Galactic halo orbit consistent with passing near the Galactic Centre, making it a probe of formation channels, neutron star kick physics and binary evolution.", "doi": "10.1038/s41586-022-04551-1", "issn": "0028-0836", "publisher": "Nature Publishing Group", "publication": "Nature", "publication_date": "2022-05-05", "series_number": "7908", "volume": "605", "issue": "7908", "pages": "41-45" }, { "id": "authors:5r85g-ac787", "collection": "authors", "collection_id": "5r85g-ac787", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220224-200914705", "type": "article", "title": "A Massive AGB Donor in Scutum X-1: Identification of the First Mira Variable in an X-Ray Binary", "author": [ { "family_name": "De", "given_name": "Kishalay", "orcid": "0000-0002-8989-0542", "clpid": "De-Kishalay" }, { "family_name": "Chakrabarty", "given_name": "Deepto", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" }, { "family_name": "Soria", "given_name": "Roberto", "orcid": "0000-0002-4622-796X", "clpid": "Soria-Roberto" }, { "family_name": "Ashley", "given_name": "Michael C. B.", "orcid": "0000-0003-1412-2028", "clpid": "Ashley-Michael-C-B" }, { "family_name": "Conroy", "given_name": "Charlie", "orcid": "0000-0002-1590-8551", "clpid": "Conroy-Charlie" }, { "family_name": "Hankins", "given_name": "Matthew J.", "orcid": "0000-0001-9315-8437", "clpid": "Hankins-Matthew-J" }, { "family_name": "Kasliwal", "given_name": "Mansi M.", "orcid": "0000-0002-5619-4938", "clpid": "Kasliwal-M-M" }, { "family_name": "Lau", "given_name": "Ryan M.", "clpid": "Lau-Ryan-M" }, { "family_name": "Moore", "given_name": "Anna M.", "orcid": "0000-0002-2894-6936", "clpid": "Moore-Anna-M" }, { "family_name": "Simcoe", "given_name": "Robert", "orcid": "0000-0003-3769-9559", "clpid": "Simcoe-Robert-A" }, { "family_name": "Soon", "given_name": "Jamie", "clpid": "Soon-Jamie" }, { "family_name": "Travouillon", "given_name": "Tony", "orcid": "0000-0002-7279-3658", "clpid": "Travouillon-Tony-D" } ], "abstract": "The symbiotic X-ray binary Sct X-1 was suggested to be the first known neutron star accreting from a red supergiant companion. Although known for nearly 50 yr, detailed characterization of the donor remains lacking, particularly due to the extremely high reddening toward the source (A_V \u2273 25 mag). Here, we present (i) improved localization of the counterpart using Gaia and Chandra observations, (ii) the first broadband infrared spectrum (\u22481\u20135 \u03bcm; R \u2248 2000) obtained with SpeX on the NASA Infrared Telescope Facility, and (iii) the J-band light curve from the Palomar Gattini-IR survey. The infrared spectrum is characterized by (i) deep water absorption features (H\u2082O index \u2248 40%), (ii) strong TiO, VO, and CO features, and (iii) weak/absent CN lines. We show that these features are inconsistent with known red supergiants but suggest an M8-9 III\u2013type O-rich Mira donor star. We report the discovery of large-amplitude (\u0394J \u2248 3.5 mag) periodic photometric variability, suggesting a pulsation period of 621 \u00b1 36 (systematic) \u00b1 8 (statistical) days, which we use to constrain the donor to be a relatively luminous Mira (M_K = \u22128.6 \u00b1 0.3 mag) at a distance of 3.6^(+0.8)_(\u22120.7) kpc. Comparing these characteristics to recent models, we find the donor to be consistent with a \u22483\u20135 M\u2299 star at an age of \u22480.1\u20130.3 Gyr. Together, we show that Sct X-1 was previously misclassified as an evolved high-mass X-ray binary; instead, it is an intermediate-mass system with the first confirmed Mira donor in an X-ray binary. We discuss the implications of Mira donors in symbiotic X-ray binaries and highlight the potential of wide-field infrared time-domain surveys and broadband infrared spectroscopy to unveil their demographics.", "doi": "10.3847/2041-8213/ac5b11", "issn": "2041-8205", "publisher": "American Astronomical Society", "publication": "Astrophysical Journal Letters", "publication_date": "2022-03-20", "series_number": "1", "volume": "928", "issue": "1", "pages": "Art. No. L8" }, { "id": "authors:3mzv9-ab577", "collection": "authors", "collection_id": "3mzv9-ab577", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220309-982137000", "type": "article", "title": "Radius Constraints from Reflection Modeling of Cygnus X-2 with NuSTAR and NICER", "author": [ { "family_name": "Ludlam", "given_name": "R. M.", "orcid": "0000-0002-8961-939X", "clpid": "Ludlam-Renee-M" }, { "family_name": "Cackett", "given_name": "E. M.", "orcid": "0000-0002-8294-9281", "clpid": "Cackett-Edward-M" }, { "family_name": "Garc\u00eda", "given_name": "J. A.", "orcid": "0000-0003-3828-2448", "clpid": "Garc\u00eda-Javier-A" }, { "family_name": "Miller", "given_name": "J. M.", "clpid": "Miller-Jon-M" }, { "family_name": "Stevens", "given_name": "A. L.", "orcid": "0000-0002-5041-3079", "clpid": "Stevens-Abigail-L" }, { "family_name": "Fabian", "given_name": "A. C.", "orcid": "0000-0002-9378-4072", "clpid": "Fabian-Andrew-C" }, { "family_name": "Homan", "given_name": "J.", "orcid": "0000-0001-8371-2713", "clpid": "Homan-Jeroen" }, { "family_name": "Ng", "given_name": "M.", "orcid": "0000-0002-0940-6563", "clpid": "Ng-Mason" }, { "family_name": "Guillot", "given_name": "S.", "orcid": "0000-0002-6449-106X", "clpid": "Guillot-Sebastien" }, { "family_name": "Buisson", "given_name": "D. J. K.", "clpid": "Buisson-Douglas-J-K" }, { "family_name": "Chakrabarty", "given_name": "D.", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" } ], "abstract": "We present a spectral analysis of NuSTAR and NICER observations of the luminous, persistently accreting neutron star (NS) low-mass X-ray binary Cygnus X-2. The data were divided into different branches that the source traces out on the Z-track of the X-ray color\u2013color diagram; namely, the horizontal branch, the normal branch, and the vertex between the two. The X-ray continuum spectrum was modeled in two different ways that produced comparable quality fits. The spectra showed clear evidence of a reflection component in the form of a broadened Fe K line, as well as a lower-energy emission feature near 1 keV likely due to an ionized plasma located far from the innermost accretion disk. We account for the reflection spectrum with two independent models (relxillns and rdblur*rfxconv). The inferred inclination is in agreement with earlier estimates from optical observations of ellipsoidal lightcurve modeling (relxillns: i = 67\u00b0 \u00b1 4\u00b0; rdblur*rfxconv: i = 60\u00b0 \u00b1 10\u00b0). The inner disk radius remains close to the NS (R_(in) \u2264 1.15 R_(ISCO)) regardless of the source position along the Z-track or how the 1 keV feature is modeled. Given the optically determined NS mass of 1.71 \u00b1 0.21 M_\u2299, this corresponds to a conservative upper limit of R_(in) \u2264 19.5 km for M = 1.92 M_\u2299 or R_(in) \u2264 15.3 km for M = 1.5 M_\u2299. We compare these radius constraints to those obtained from NS gravitational wave merger events and recent NICER pulsar lightcurve modeling measurements.", "doi": "10.3847/1538-4357/ac5028", "issn": "0004-637X", "publisher": "American Astronomical Society", "publication": "Astrophysical Journal", "publication_date": "2022-03-01", "series_number": "1", "volume": "927", "issue": "1", "pages": "Art. No. 112" }, { "id": "authors:d8m7t-a6g53", "collection": "authors", "collection_id": "d8m7t-a6g53", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220127-790336500", "type": "article", "title": "Search for continuous gravitational waves from 20 accreting millisecond x-ray pulsars in O3 LIGO data", "author": [ { "family_name": "Abbott", "given_name": "R.", "clpid": "Abbott-Richard" }, { "family_name": "Abbott", "given_name": "T.\u2009D." }, { "family_name": "Acernese", "given_name": "F." }, { "family_name": "Ackley", "given_name": "K." }, { "family_name": "Adams", "given_name": "C." }, { "family_name": "Adhikari", "given_name": "N." }, { "family_name": "Adhikari", "given_name": "R. X.", "orcid": "0000-0002-5731-5076", "clpid": "Adhikari-R-X" }, { "family_name": "Adya", "given_name": "V.\u2009B." }, { "family_name": "Affeldt", "given_name": "C." }, { "family_name": "Agarwal", "given_name": "D." }, { "family_name": "Agathos", "given_name": "M." }, { "family_name": "Agatsuma", "given_name": "K." }, { "family_name": "Aggarwal", "given_name": "N." }, { "family_name": "Aguiar", "given_name": "O.\u2009D." }, { "family_name": "Aiello", "given_name": "L." }, { "family_name": "Ain", "given_name": "A." }, { "family_name": "Akutsu", "given_name": "T." }, { "family_name": "Albanesi", "given_name": "S." }, { "family_name": "Allocca", "given_name": "A." }, { "family_name": "Altin", "given_name": "P.\u2009A." }, { "family_name": "Amato", "given_name": "A." }, { "family_name": "Anand", "given_name": "C." }, { "family_name": "Anand", "given_name": "S.", "orcid": "0000-0003-3768-7515", "clpid": "Anand-Shreya" }, { "family_name": "Ananyeva", "given_name": "A.", "clpid": "Ananyeva-Alena" }, { "family_name": "Anderson", "given_name": "S. B.", "clpid": "Anderson-Stuart-B" }, { "family_name": "Anderson", "given_name": "W.\u2009G." }, { "family_name": "Ando", "given_name": "M." }, { "family_name": "Andrade", "given_name": "T." }, { "family_name": "Andres", "given_name": "N." }, { "family_name": "Andri\u0107", "given_name": "T." }, { "family_name": "Angelova", "given_name": "S.\u2009V." }, { "family_name": "Ansoldi", "given_name": "S." }, { "family_name": "Antelis", "given_name": "J.\u2009M." }, { "family_name": "Antier", "given_name": "S." }, { "family_name": "Appert", "given_name": "S.", "clpid": "Appert-Stephen" }, { "family_name": "Arai", "given_name": "Koji", "orcid": "0000-0001-8916-8915", "clpid": "Arai-Koji" }, { "family_name": "Arai", "given_name": "Koya" }, { "family_name": "Arai", "given_name": "Y." }, { "family_name": "Araki", "given_name": "S." }, { "family_name": "Araya", "given_name": "A." }, { "family_name": "Araya", "given_name": "M. C.", "orcid": "0000-0002-6018-6447", "clpid": "Araya-Melody-C" }, { "family_name": "Areeda", "given_name": "J.\u2009S." }, { "family_name": "Ar\u00e8ne", "given_name": "M." }, { "family_name": "Aritomi", "given_name": "N." }, { "family_name": "Arnaud", "given_name": "N." }, { "family_name": "Aronson", "given_name": "S.\u2009M." }, { "family_name": "Arun", "given_name": "K.\u2009G." }, { "family_name": "Asada", "given_name": "H." }, { "family_name": "Asali", "given_name": "Y." }, { "family_name": "Ashton", "given_name": "G." }, { "family_name": "Aso", "given_name": "Y." }, { "family_name": "Assiduo", "given_name": "M." }, { "family_name": "Aston", "given_name": "S.\u2009M." }, { "family_name": "Astone", "given_name": "P." }, { "family_name": "Aubin", "given_name": "F." }, { "family_name": "Austin", "given_name": "C." }, { "family_name": "Babak", "given_name": "S." }, { "family_name": "Badaracco", "given_name": "F." }, { "family_name": "Bader", "given_name": "M.\u2009K.\u2009M." }, { "family_name": "Badger", "given_name": "C." }, { "family_name": "Bae", "given_name": "S." }, { "family_name": "Bae", "given_name": "Y." }, { "family_name": "Baer", "given_name": "A.\u2009M." }, { "family_name": "Bagnasco", "given_name": "S." }, { "family_name": "Bai", "given_name": "Y.", "clpid": "Bai-Yuntao" }, { "family_name": "Baiotti", "given_name": "L." }, { "family_name": "Baird", "given_name": "J." }, { "family_name": "Bajpai", "given_name": "R." }, { "family_name": "Ball", "given_name": "M." }, { "family_name": "Ballardin", "given_name": "G." }, { "family_name": "Ballmer", "given_name": "S.\u2009W." }, { "family_name": "Balsamo", "given_name": "A." }, { "family_name": "Baltus", "given_name": "G." }, { "family_name": "Banagiri", "given_name": "S." }, { "family_name": "Bankar", "given_name": "D." }, { "family_name": "Barayoga", "given_name": "J. C.", "clpid": "Barayoga-Juan-C" }, { "family_name": "Barbieri", "given_name": "C." }, { "family_name": "Barish", "given_name": "B. C.", "orcid": "0000-0001-6386-7371", "clpid": "Barish-B-C" }, { "family_name": "Barker", "given_name": "D." }, { "family_name": "Barneo", "given_name": "P." }, { "family_name": "Barone", "given_name": "F." }, { "family_name": "Barr", "given_name": "B." }, { "family_name": "Barsotti", "given_name": "L." }, { "family_name": "Barsuglia", "given_name": "M." }, { "family_name": "Barta", "given_name": "D." }, { "family_name": "Bartlett", "given_name": "J." }, { "family_name": "Barton", "given_name": "M.\u2009A." }, { "family_name": "Bartos", "given_name": "I." }, { "family_name": "Bassiri", "given_name": "R." }, { "family_name": "Basti", "given_name": "A." }, { "family_name": "Bawaj", "given_name": "M." }, { "family_name": "Bayley", "given_name": "J.\u2009C." }, { "family_name": "Baylor", "given_name": "A.\u2009C." }, { "family_name": "Bazzan", "given_name": "M." }, { "family_name": "B\u00e9csy", "given_name": "B." }, { "family_name": "Bedakihale", "given_name": "V.\u2009M." }, { "family_name": "Bejger", "given_name": "M." }, { "family_name": "Belahcene", "given_name": "I." }, { "family_name": "Benedetto", "given_name": "V." }, { "family_name": "Beniwal", "given_name": "D." }, { "family_name": "Bennett", "given_name": "T.\u2009F." }, { "family_name": "Bentley", "given_name": "J.\u2009D." }, { "family_name": "BenYaala", "given_name": "M." }, { "family_name": "Bergamin", "given_name": "F." }, { "family_name": "Berger", "given_name": "B.\u2009K." }, { "family_name": "Bernuzzi", "given_name": "S." }, { "family_name": "Bersanetti", "given_name": "D.", "orcid": "0000-0002-7377-415X" }, { "family_name": "Bertolini", "given_name": "A." }, { "family_name": "Betzwieser", "given_name": "J.", "orcid": "0000-0003-1533-9229" }, { "family_name": "Beveridge", "given_name": "D." }, { "family_name": "Bhandare", "given_name": "R." }, { "family_name": "Bhardwaj", "given_name": "U." }, { "family_name": "Bhattacharjee", "given_name": "D." }, { "family_name": "Bhaumik", "given_name": "S." }, { "family_name": "Bilenko", "given_name": "I.\u2009A." }, { "family_name": "Billingsley", "given_name": "G.", "orcid": "0000-0002-4141-2744", "clpid": "Billingsley-GariLynn" }, { "family_name": "Bini", "given_name": "S." }, { "family_name": "Birney", "given_name": "R." }, { "family_name": "Birnholtz", "given_name": "O." }, { "family_name": "Biscans", "given_name": "S.", "orcid": "0000-0002-9635-7527", "clpid": "Biscans-Sebastien" }, { "family_name": "Bischi", "given_name": "M." }, { "family_name": "Biscoveanu", "given_name": "S.", "orcid": "0000-0001-7616-7366" }, { "family_name": "Bisht", "given_name": "A." }, { "family_name": "Biswas", "given_name": "B.", "orcid": "0000-0003-2131-1476" }, { "family_name": "Bitossi", "given_name": "M." }, { "family_name": "Bizouard", "given_name": "M.-A.", "orcid": "0000-0002-4618-1674" }, { "family_name": "Blackburn", "given_name": "J. K.", "orcid": "0000-0002-3838-2986", "clpid": "Blackburn-J-Kent" }, { "family_name": "Blair", "given_name": "C.\u2009D." }, { "family_name": "Blair", "given_name": "D.\u2009G." }, { "family_name": "Blair", "given_name": "R.\u2009M." }, { "family_name": "Bobba", "given_name": "F." }, { "family_name": "Bode", "given_name": "N." }, { "family_name": "Boer", "given_name": "M." }, { "family_name": "Bogaert", "given_name": "G." }, { "family_name": "Boldrini", "given_name": "M." }, { "family_name": "Bonavena", "given_name": "L.\u2009D." }, { "family_name": "Bondu", "given_name": "F." }, { "family_name": "Bonilla", "given_name": "E." }, { "family_name": "Bonnand", "given_name": "R." }, { "family_name": "Booker", "given_name": "P." }, { "family_name": "Boom", "given_name": "B.\u2009A." }, { "family_name": "Bork", "given_name": "R.", "clpid": "Bork-Rolf-G" }, { "family_name": "Boschi", "given_name": "V." }, { "family_name": "Bose", "given_name": "N." }, { "family_name": "Bose", "given_name": "S." }, { "family_name": "Bossilkov", "given_name": "V." }, { "family_name": "Boudart", "given_name": "V." }, { "family_name": "Bouffanais", "given_name": "Y." }, { "family_name": "Bozzi", "given_name": "A." }, { "family_name": "Bradaschia", "given_name": "C." }, { "family_name": "Brady", "given_name": "P.\u2009R." }, { "family_name": "Bramley", "given_name": "A." }, { "family_name": "Branch", "given_name": "A." }, { "family_name": "Branchesi", "given_name": "M." }, { "family_name": "Brau", "given_name": "J.\u2009E." }, { "family_name": "Breschi", "given_name": "M." }, { "family_name": "Briant", "given_name": "T." }, { "family_name": "Briggs", "given_name": "J.\u2009H." }, { "family_name": "Brillet", "given_name": "A." }, { "family_name": "Brinkmann", "given_name": "M." }, { "family_name": "Brockill", "given_name": "P." }, { "family_name": "Brooks", "given_name": "A. F.", "orcid": "0000-0003-4295-792X", "clpid": "Brooks-Aidan-F" }, { "family_name": "Brooks", "given_name": "J." }, { "family_name": "Brown", "given_name": "D.\u2009D." }, { "family_name": "Brunett", "given_name": "S.", "clpid": "Brunett-Sharon-M" }, { "family_name": "Bruno", "given_name": "G." }, { "family_name": "Bruntz", "given_name": "R." }, { "family_name": "Bryant", "given_name": "J." }, { "family_name": "Bulik", "given_name": "T." }, { "family_name": "Bulten", "given_name": "H.\u2009J." }, { "family_name": "Buonanno", "given_name": "A." }, { "family_name": "Buscicchio", "given_name": "R." }, { "family_name": "Buskulic", "given_name": "D." }, { "family_name": "Buy", "given_name": "C." }, { "family_name": "Byer", "given_name": "R.\u2009L." }, { "family_name": "Cadonati", "given_name": "L." }, { "family_name": "Cagnoli", "given_name": "G." }, { "family_name": "Cahillane", "given_name": "C." }, { "family_name": "Calder\u00f3n Bustillo", "given_name": "J.", "orcid": "0000-0002-4171-5884" }, { "family_name": "Callaghan", "given_name": "J.\u2009D." }, { "family_name": "Callister", "given_name": "T.\u2009A." }, { "family_name": "Calloni", "given_name": "E." }, { "family_name": "Cameron", "given_name": "J." }, { "family_name": "Camp", "given_name": "J.\u2009B." }, { "family_name": "Canepa", "given_name": "M." }, { "family_name": "Canevarolo", "given_name": "S." }, { "family_name": "Cannavacciuolo", "given_name": "M." }, { "family_name": "Cannon", "given_name": "K.\u2009C." }, { "family_name": "Cao", "given_name": "H." }, { "family_name": "Cao", "given_name": "Z." }, { "family_name": "Capocasa", "given_name": "E." }, { "family_name": "Capote", "given_name": "E." }, { "family_name": "Carapella", "given_name": "G." }, { "family_name": "Carbognani", "given_name": "F." }, { "family_name": "Carlin", "given_name": "J.\u2009B." }, { "family_name": "Carney", "given_name": "M.\u2009F." }, { "family_name": "Carpinelli", "given_name": "M." }, { "family_name": 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L.", "clpid": "Willis-Joshua-L" }, { "family_name": "Willke", "given_name": "B.", "orcid": "0000-0003-0524-2925" }, { "family_name": "Wilson", "given_name": "D.\u2009J." }, { "family_name": "Winkler", "given_name": "W." }, { "family_name": "Wipf", "given_name": "C. C.", "clpid": "Wipf-Christopher-C" }, { "family_name": "Wlodarczyk", "given_name": "T." }, { "family_name": "Woan", "given_name": "G." }, { "family_name": "Woehler", "given_name": "J." }, { "family_name": "Wofford", "given_name": "J.\u2009K." }, { "family_name": "Wong", "given_name": "I. C. F.", "orcid": "0000-0003-2166-0027" }, { "family_name": "Wu", "given_name": "C." }, { "family_name": "Wu", "given_name": "D.\u2009S." }, { "family_name": "Wu", "given_name": "H." }, { "family_name": "Wu", "given_name": "S." }, { "family_name": "Wysocki", "given_name": "D.\u2009M." }, { "family_name": "Xiao", "given_name": "L.", "orcid": "0000-0003-2703-449X", "clpid": "Xiao-Liting" }, { "family_name": "Xu", "given_name": "W-R." }, { "family_name": "Yamada", "given_name": "T." }, { "family_name": "Yamamoto", "given_name": "H.", "orcid": "0000-0001-6919-9570", "clpid": "Yamamoto-Hiroaki" }, { "family_name": "Yamamoto", "given_name": "Kazuhiro" }, { "family_name": "Yamamoto", "given_name": "Kohei" }, { "family_name": "Yamamoto", "given_name": "T." }, { "family_name": "Yamashita", "given_name": "K." }, { "family_name": "Yamazaki", "given_name": "R." }, { "family_name": "Yang", "given_name": "F.\u2009W." }, { "family_name": "Yang", "given_name": "L." }, { "family_name": "Yang", "given_name": "Y." }, { "family_name": "Yang", "given_name": "Yang" }, { "family_name": "Yang", "given_name": "Z." }, { "family_name": "Yap", "given_name": "M.\u2009J." }, { "family_name": "Yeeles", "given_name": "D.\u2009W." }, { "family_name": "Yelikar", "given_name": "A.\u2009B." }, { "family_name": "Ying", "given_name": "M." }, { "family_name": "Yokogawa", "given_name": "K." }, { "family_name": "Yokoyama", "given_name": "J." }, { "family_name": "Yokozawa", "given_name": "T." }, { "family_name": "Yoo", "given_name": "J." }, { "family_name": "Yoshioka", "given_name": "T." }, { "family_name": "Yu", "given_name": "Hang", "orcid": "0000-0002-6011-6190", "clpid": "Yu-Hang-LIGO" }, { "family_name": "Yu", "given_name": "Haocun", "orcid": "0000-0002-7597-098X" }, { "family_name": "Yuzurihara", "given_name": "H." }, { "family_name": "Zadro\u017cny", "given_name": "A." }, { "family_name": "Zanolin", "given_name": "M." }, { "family_name": "Zeidler", "given_name": "S." }, { "family_name": "Zelenova", "given_name": "T." }, { "family_name": "Zendri", "given_name": "J.-P." }, { "family_name": "Zevin", "given_name": "M." }, { "family_name": "Zhan", "given_name": "M." }, { "family_name": "Zhang", "given_name": "H." }, { "family_name": "Zhang", "given_name": "J." }, { "family_name": "Zhang", "given_name": "L.", "orcid": "0000-0002-0898-787X", "clpid": "Zhang-Liyuan" }, { "family_name": "Zhang", "given_name": "T." }, { "family_name": "Zhang", "given_name": "Y." }, { "family_name": "Zhao", "given_name": "C." }, { "family_name": "Zhao", "given_name": "G." }, { "family_name": "Zhao", "given_name": "Y." }, { "family_name": "Zhao", "given_name": "Yue" }, { "family_name": "Zhou", "given_name": "R." }, { "family_name": "Zhou", "given_name": "Z." }, { "family_name": "Zhu", "given_name": "X.\u2009J." }, { "family_name": "Zhu", "given_name": "Z.-H." }, { "family_name": "Zucker", "given_name": "M. E.", "orcid": "0000-0002-2544-1596", "clpid": "Zucker-Michael-E" }, { "family_name": "Zweizig", "given_name": "J.", "orcid": "0000-0002-1521-3397", "clpid": "Zweizig-John" }, { "family_name": "Albayati", "given_name": "A.\u2009C." }, { "family_name": "Altamirano", "given_name": "D.", "orcid": "0000-0002-3422-0074" }, { "family_name": "Bult", "given_name": "P." }, { "family_name": "Chakrabarty", "given_name": "D.", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" }, { "family_name": "Ng", "given_name": "M." }, { "family_name": "Ray", "given_name": "P.\u2009S." }, { "family_name": "Sanna", "given_name": "A." }, { "family_name": "Strohmayer", "given_name": "T.\u2009E." }, { "literal": "LIGO Scientific Collaboration" }, { "literal": "Virgo Collaboration" }, { "literal": "KAGRA Collaboration" } ], "abstract": "Results are presented of searches for continuous gravitational waves from 20 accreting millisecond x-ray pulsars with accurately measured spin frequencies and orbital parameters, using data from the third observing run of the Advanced LIGO and Advanced Virgo detectors. The search algorithm uses a hidden Markov model, where the transition probabilities allow the frequency to wander according to an unbiased random walk, while the J-statistic maximum-likelihood matched filter tracks the binary orbital phase. Three narrow subbands are searched for each target, centered on harmonics of the measured spin frequency. The search yields 16 candidates, consistent with a false alarm probability of 30% per subband and target searched. These candidates, along with one candidate from an additional target-of-opportunity search done for SAX J1808.4\u22123658, which was in outburst during one month of the observing run, cannot be confidently associated with a known noise source. Additional follow-up does not provide convincing evidence that any are a true astrophysical signal. When all candidates are assumed nonastrophysical, upper limits are set on the maximum wave strain detectable at 95% confidence, h^(95%)\u2080. The strictest constraint is h^(95%)\u2080 = 4.7\u00d710\u207b\u00b2\u2076 from IGR J17062\u22126143. Constraints on the detectable wave strain from each target lead to constraints on neutron star ellipticity and r-mode amplitude, the strictest of which are \u03b5^(95%) = 3.1\u00d710\u207b\u2077 and \u03b1^(95%) = 1.8\u00d710\u207b\u2075 respectively. This analysis is the most comprehensive and sensitive search of continuous gravitational waves from accreting millisecond x-ray pulsars to date.", "doi": "10.1103/physrevd.105.022002", "issn": "2470-0010", "publisher": "American Physical Society", "publication": "Physical Review D", "publication_date": "2022-01-15", "series_number": "2", "volume": "105", "issue": "2", "pages": "Art. No. 022002" }, { "id": "authors:cbvvj-qzd05", "collection": "authors", "collection_id": "cbvvj-qzd05", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20220622-517967900", "type": "book_section", "title": "The Globe Orbiting Soft X-ray (GOSoX) polarimeter concept study", "book_title": "Optics for EUV, X-Ray, and Gamma-Ray Astronomy X", "author": [ { "family_name": "Marshall", "given_name": "Herman L.", "orcid": "0000-0002-6492-1293", "clpid": "Marshall-Herman-L" }, { "family_name": "Heine", "given_name": "Sarah N. T.", "clpid": "Heine-Sarah-N-T" }, { "family_name": "Davidson", "given_name": "Rosemary", "clpid": "Davidson-Rosemary" }, { "family_name": "Garner", "given_name": "Alan", "clpid": "Garner-Alan" }, { "family_name": "Gullikson", "given_name": "Eric M.", "clpid": "Gullickson-Eric-M" }, { "family_name": "G\u00fcnther", "given_name": "H. Moritz", "clpid": "G\u00fcnther-H-Moritz" }, { "family_name": "Leitz", "given_name": "Christopher", "clpid": "Leitz-Christopher" }, { "family_name": "Masterson", "given_name": "Rebecca", "clpid": "Masterson-Rebecca" }, { "family_name": "Miller", "given_name": "Eric D.", "clpid": "Miller-Eric-D" }, { "family_name": "Stenzel", "given_name": "June S.", "clpid": "Stenzel-June-S" }, { "family_name": "Zhang", "given_name": "William W.", "orcid": "0000-0002-1426-9698", "clpid": "Zhang-W-W" }, { "family_name": "Boissay-Malaquin", "given_name": "Rozenn", "clpid": "Boissay-Malaquin-Rozenn" }, { "family_name": "Caiazzo", "given_name": "Ilaria", "orcid": "0000-0002-4770-5388", "clpid": "Caiazzo-Ilaria" }, { "family_name": "Chakrabarty", "given_name": "Deepto", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" }, { "family_name": "Gallo", "given_name": "Luigi C.", "clpid": "Gallo-Luigi-C" }, { "family_name": "Heilmann", "given_name": "Ralf K.", "orcid": "0000-0001-9980-5295", "clpid": "Heilmann-Ralf-K" }, { "family_name": "Heyl", "given_name": "Jeremy", "orcid": "0000-0001-9739-367X", "clpid": "Heyl-Jeremy" }, { "family_name": "Kara", "given_name": "Erin", "orcid": "0000-0003-0172-0854", "clpid": "Kara-Erin" }, { "family_name": "Schulz", "given_name": "Norbert S.", "clpid": "Schulz-Norbert-S" } ], "contributor": [ { "family_name": "O'Dell", "given_name": "Stephen L.", "clpid": "O'Dell-Stephen-L" }, { "family_name": "Gaskin", "given_name": "Jessica A.", "clpid": "Gaskin-Jessica-A" }, { "family_name": "Pareschi", "given_name": "Giovanni", "clpid": "Pareschi-Giovanni" } ], "abstract": "We describe an implementation of a broad-band soft X-ray polarimeter, substantially based on previous designs. The Globe-Orbiting Soft X-ray Polarimeter (GOSoX) is a SmallSat. As in a related mission concept the PiSoX Polarimeter, the grating arrangement is designed optimally for the purpose of polarimetry matching the dispersion of a spectrometer to a laterally graded multilayer (LGML). For GOSoX, the optics are lightweight Si mirrors in a one-bounce parabolic configuration. The instrument covers the wavelength range from 31 A to 75 A (165 - 400 eV). Upon satellite rotation, the intensities of the dispersed spectra, after reflection and polarizing by the LGMLs, give the three Stokes parameters needed to determine a source's linear polarization fraction and orientation. The design can be extended to higher energies as LGMLs are developed further. We describe the potential scientific return and the proposed mission concept following the results of a JPL Team X concept study.", "doi": "10.1117/12.2596186", "isbn": "9781510644823", "publisher": "Society of Photo-Optical Instrumentation Engineers", "place_of_publication": "Bellingham, WA", "publication_date": "2021-08-23", "pages": "Art. No. 118220O" }, { "id": "authors:a0pfa-9y081", "collection": "authors", "collection_id": "a0pfa-9y081", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20210429-144554967", "type": "article", "title": "Simultaneous NICER and NuSTAR Observations of the Ultracompact X-Ray Binary 4U 1543\u2013624", "author": [ { "family_name": "Ludlam", "given_name": "R. M.", "orcid": "0000-0002-8961-939X", "clpid": "Ludlam-Renee-M" }, { "family_name": "Jaodand", "given_name": "A. D.", "orcid": "0000-0002-3850-6651", "clpid": "Jaodand-Amruta-D" }, { "family_name": "Garc\u00eda", "given_name": "J. A.", "orcid": "0000-0003-3828-2448", "clpid": "Garc\u00eda-Javier-A" }, { "family_name": "Degenaar", "given_name": "N.", "clpid": "Degenaar-N" }, { "family_name": "Tomsick", "given_name": "J. A.", "orcid": "0000-0001-5506-9855", "clpid": "Tomsick-John-A" }, { "family_name": "Cackett", "given_name": "E. M.", "orcid": "0000-0002-8294-9281", "clpid": "Cackett-Edward-M" }, { "family_name": "Fabian", "given_name": "A. C.", "orcid": "0000-0002-9378-4072", "clpid": "Fabian-Andrew-C" }, { "family_name": "Gandhi", "given_name": "P.", "orcid": "0000-0003-3105-2615", "clpid": "Gandhi-Poshak" }, { "family_name": "Buisson", "given_name": "D. J. K.", "clpid": "Buisson-Douglas-J-K" }, { "family_name": "Shaw", "given_name": "A. W.", "orcid": "0000-0002-8808-520X", "clpid": "Shaw-Aarran-W" }, { "family_name": "Chakrabarty", "given_name": "D.", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" } ], "abstract": "We present the first joint NuSTAR and NICER observations of the ultracompact X-ray binary (UCXB) 4U 1543\u2212624 obtained in 2020 April. The source was at a luminosity of L_(0.5\u221250 keV) = 4.9(D/7 kpc)\u00b2 \u00d7 1036 erg s\u207b\u00b9 and showed evidence of reflected emission in the form of an O viii line, Fe K line, and Compton hump within the spectrum. We used a full reflection model, known as xillverCO, that is tailored for the atypical abundances found in UCXBs, to account for the reflected emission. We tested the emission radii of the O and Fe line components and conclude that they originate from a common disk radius in the innermost region of the accretion disk (R_(in) \u2264 1.07 R_(ISCO)). Assuming that the compact accretor is a neutron star (NS) and the position of the inner disk is the Alfv\u00e9n radius, we placed an upper limit on the magnetic field strength to be B \u2264 0.7(D/7 kpc) \u00d7 10\u2078 G at the poles. Given the lack of pulsations detected and position of R_(in), it was likely that a boundary layer region had formed between the NS surface and inner edge of the accretion disk with an extent of 1.2 km. This implies a maximum radius of the neutron star accretor of R_(NS) \u2264 12.1 km when assuming a canonical NS mass of 1.4 M_\u2299.", "doi": "10.3847/1538-4357/abedb0", "issn": "0004-637X", "publisher": "American Astronomical Society", "publication": "Astrophysical Journal", "publication_date": "2021-04-20", "series_number": "2", "volume": "911", "issue": "2", "pages": "Art. No. 123" }, { "id": "authors:x118m-af972", "collection": "authors", "collection_id": "x118m-af972", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20201217-143533333", "type": "book_section", "title": "A small satellite version of a soft x-ray polarimeter", "book_title": "Space Telescopes and Instrumentation 2020: Ultraviolet to Gamma Ray", "author": [ { "family_name": "Marshall", "given_name": "Herman L.", "clpid": "Marshall-Herman-L" }, { "family_name": "Heine", "given_name": "Sarah N. T.", "clpid": "Heine-Sarah-N-T" }, { "family_name": "Garner", "given_name": "Alan", "clpid": "Garner-Alan" }, { "family_name": "Gullikson", "given_name": "Eric M.", "clpid": "Gullickson-Eric-M" }, { "family_name": "G\u00fcnther", "given_name": "H. Moritz", "clpid": "G\u00fcnther-H-Moritz" }, { "family_name": "Leitz", "given_name": "Christopher", "clpid": "Leitz-Christopher" }, { "family_name": "Masterson", "given_name": "Rebecca", "clpid": "Masterson-Rebecca" }, { "family_name": "Miller", "given_name": "Eric D.", "clpid": "Miller-Eric-D" }, { "family_name": "Zhang", "given_name": "William", "orcid": "0000-0002-1426-9698", "clpid": "Zhang-William-W" }, { "family_name": "Boissay-Malaquin", "given_name": "Rozenn", "clpid": "Boissay-Malaquin-Rozenn" }, { "family_name": "Caiazzo", "given_name": "Ilaria", "orcid": "0000-0002-4770-5388", "clpid": "Caiazzo-Ilaria" }, { "family_name": "Chakrabarty", "given_name": "Deepto", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" }, { "family_name": "Davidson", "given_name": "Rosemary", "clpid": "Davidson-Rosemary" }, { "family_name": "Gallo", "given_name": "Luigi C.", "clpid": "Gallo-Luigi-C" }, { "family_name": "Heilmann", "given_name": "Ralf K.", "clpid": "Heilmann-Ralf-K" }, { "family_name": "Heyl", "given_name": "Jeremy", "orcid": "0000-0001-9739-367X", "clpid": "Heyl-Jeremy" }, { "family_name": "Kara", "given_name": "Erin", "orcid": "0000-0003-0172-0854", "clpid": "Kara-Erin" }, { "family_name": "Marscher", "given_name": "Alan", "orcid": "0000-0001-7396-3332", "clpid": "Marscher-Alan-P" }, { "family_name": "Schulz", "given_name": "Norbert S.", "clpid": "Schulz-Norbert-S" } ], "contributor": [ { "family_name": "den Herder", "given_name": "Jan-Willem A.", "clpid": "den-Herder-Jan-Willem-A" }, { "family_name": "Nikzad", "given_name": "Shouleh", "clpid": "Nikzad-Shouleh" }, { "family_name": "Nakazawa", "given_name": "Kazuhiro", "clpid": "Nakazawa-Kazuhiro" } ], "abstract": "We describe a new implementation of a broad-band soft X-ray polarimeter, substantially based on a previous design. This implementation, the Pioneer Soft X-ray Polarimeter (PiSoX) is a SmallSat, designed for NASA's call for Astrophysics Pioneers, small missions that could be CubeSats, balloon experiments, or SmallSats. As in REDSoX, the grating arrangement is designed optimally for the purpose of polarimetry with broad-band focussing optics by matching the dispersion of the spectrometer channels to laterally graded multilayers (LGMLs). The system can achieve polarization modulation factors over 90%. For PiSoX, the optics are lightweight Si mirrors in a one-bounce parabolic configuration. High efficiency, blazed gratings from opposite sectors are oriented to disperse to a LGML forming a channel covering the wavelength range from 35 \u00c5 to 75 \u00c5 (165 - 350 eV). Upon satellite rotation, the intensities of the dispersed spectra, after reflection and polarizing by the LGMLs, give the three Stokes parameters needed to determine a source's linear polarization fraction and orientation. The design can be extended to higher energies as LGMLs are developed further. We describe examples of the potential scientific return from instruments based on this design.", "doi": "10.1117/12.2562811", "isbn": "9781510636750", "publisher": "Society of Photo-Optical Instrumentation Engineers (SPIE)", "place_of_publication": "Bellingham, WA", "publication_date": "2020-12-13", "pages": "Art. No. 114442Y" }, { "id": "authors:p7g3f-efq19", "collection": "authors", "collection_id": "p7g3f-efq19", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191213-105040363", "type": "article", "title": "A NICER View of PSR J0030+0451: Millisecond Pulsar Parameter Estimation", "author": [ { "family_name": "Riley", "given_name": "T. E.", "orcid": "0000-0001-9313-0493", "clpid": "Riley-Thomas-E" }, { "family_name": "Watts", "given_name": "A. L.", "orcid": "0000-0002-1009-2354", "clpid": "Watts-Anna-L" }, { "family_name": "Bogdanov", "given_name": "S.", "orcid": "0000-0002-9870-2742", "clpid": "Bogdanov-Slavko" }, { "family_name": "Ray", "given_name": "P. S.", "orcid": "0000-0002-5297-5278", "clpid": "Ray-Paul-S" }, { "family_name": "Ludlam", "given_name": "R. M.", "orcid": "0000-0002-8961-939X", "clpid": "Ludlam-Renee-M" }, { "family_name": "Guillot", "given_name": "S.", "orcid": "0000-0002-6449-106X", "clpid": "Guillot-Sebastien" }, { "family_name": "Arzoumanian", "given_name": "Z.", "clpid": "Arzoumanian-Zaven" }, { "family_name": "Baker", "given_name": "C. L.", "clpid": "Baker-C-L" }, { "family_name": "Bilous", "given_name": "A. V.", "orcid": "0000-0002-7177-6987", "clpid": "Bilous-Anna-V" }, { "family_name": "Chakrabarty", "given_name": "D.", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" }, { "family_name": "Gendreau", "given_name": "K. C.", "orcid": "0000-0001-7115-2819", "clpid": "Gendreau-Keith-C" }, { "family_name": "Harding", "given_name": "A. K.", "orcid": "0000-0001-6119-859X", "clpid": "Harding-Alice-K" }, { "family_name": "Ho", "given_name": "W. C. G.", "orcid": "0000-0002-6089-6836", "clpid": "Ho-Wynn-C-G" }, { "family_name": "Lattimer", "given_name": "J. M.", "orcid": "0000-0002-5907-4552", "clpid": "Lattimer-James-M" }, { "family_name": "Morsink", "given_name": "S. M.", "orcid": "0000-0003-4357-0575", "clpid": "Morsink-Sharon-M" }, { "family_name": "Strohmayer", "given_name": "T. E.", "orcid": "0000-0001-7681-5845", "clpid": "Strohmayer-Tod-E" } ], "abstract": "We report on Bayesian parameter estimation of the mass and equatorial radius of the millisecond pulsar PSR J0030+0451, conditional on pulse-profile modeling of Neutron Star Interior Composition Explorer X-ray spectral-timing event data. We perform relativistic ray-tracing of thermal emission from hot regions of the pulsar's surface. We assume two distinct hot regions based on two clear pulsed components in the phase-folded pulse-profile data; we explore a number of forms (morphologies and topologies) for each hot region, inferring their parameters in addition to the stellar mass and radius. For the family of models considered, the evidence (prior predictive probability of the data) strongly favors a model that permits both hot regions to be located in the same rotational hemisphere. Models wherein both hot regions are assumed to be simply connected circular single-temperature spots, in particular those where the spots are assumed to be reflection-symmetric with respect to the stellar origin, are strongly disfavored. For the inferred configuration, one hot region subtends an angular extent of only a few degrees (in spherical coordinates with origin at the stellar center) and we are insensitive to other structural details; the second hot region is far more azimuthally extended in the form of a narrow arc, thus requiring a larger number of parameters to describe. The inferred mass M and equatorial radius R_(eq) are, respectively, 1.34_(-0.16)^(+0.15) M_\u2299 and 12.71_(-1.19)^(+1.14) km, while the compactness GM/{R_(eq) c^2= 0.156_(-0.010)^(+0.008) is more tightly constrained; the credible interval bounds reported here are approximately the 16% and 84% quantiles in marginal posterior mass.", "doi": "10.3847/2041-8213/ab481c", "issn": "2041-8213", "publisher": "American Astronomical Society", "publication": "Astrophysical Journal Letters", "publication_date": "2019-12-10", "series_number": "1", "volume": "887", "issue": "1", "pages": "Art. No. L21" }, { "id": "authors:xtmmd-stj06", "collection": "authors", "collection_id": "xtmmd-stj06", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191213-105044542", "type": "article", "title": "A Nicer View of PSR J0030+0451: Implications for the Dense Matter Equation of State", "author": [ { "family_name": "Raaijmakers", "given_name": "G.", "orcid": "0000-0002-9397-786X", "clpid": "Raaijmakers-Geert" }, { "family_name": "Riley", "given_name": "T. E.", "orcid": "0000-0001-9313-0493", "clpid": "Riley-Thomas-E" }, { "family_name": "Watts", "given_name": "A. L.", "orcid": "0000-0002-1009-2354", "clpid": "Watts-Anna-L" }, { "family_name": "Greif", "given_name": "S. K.", "clpid": "Greif-S-K" }, { "family_name": "Morsink", "given_name": "S. M.", "orcid": "0000-0003-4357-0575", "clpid": "Morsink-Sharon-M" }, { "family_name": "Hebeler", "given_name": "K.", "clpid": "Hebeler-K" }, { "family_name": "Schwenk", "given_name": "A.", "clpid": "Schwenk-A" }, { "family_name": "Hinderer", "given_name": "T.", "orcid": "0000-0002-3394-6105", "clpid": "Hinderer-Tanja" }, { "family_name": "Nissanke", "given_name": "S.", "orcid": "0000-0001-6573-7773", "clpid": "Nissanke-Samaya-M" }, { "family_name": "Guillot", "given_name": "S.", "orcid": "0000-0002-6449-106X", "clpid": "Guillot-Sebastien" }, { "family_name": "Arzoumanian", "given_name": "Z.", "clpid": "Arzoumanian-Zaven" }, { "family_name": "Bogdanov", "given_name": "S.", "orcid": "0000-0002-9870-2742", "clpid": "Bogdanov-Slavko" }, { "family_name": "Chakrabarty", "given_name": "D.", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" }, { "family_name": "Gendreau", "given_name": "K. C.", "orcid": "0000-0001-7115-2819", "clpid": "Gendreau-Keith-C" }, { "family_name": "Ho", "given_name": "W. C. G.", "orcid": "0000-0002-6089-6836", "clpid": "Ho-Wynn-C-G" }, { "family_name": "Lattimer", "given_name": "J. M.", "orcid": "0000-0002-5907-4552", "clpid": "Lattimer-James-M" }, { "family_name": "Ludlam", "given_name": "R. M.", "orcid": "0000-0002-8961-939X", "clpid": "Ludlam-Renee-M" }, { "family_name": "Wolff", "given_name": "M. T.", "orcid": "0000-0002-4013-5650", "clpid": "Wolff-Michael-T" } ], "abstract": "Both the mass and radius of the millisecond pulsar PSR J0030+0451 have been inferred via pulse-profile modeling of X-ray data obtained by NASA's Neutron Star Interior Composition Explorer (NICER) mission. In this Letter we study the implications of the mass\u2013radius inference reported for this source by Riley et al. for the dense matter equation of state (EoS), in the context of prior information from nuclear physics at low densities. Using a Bayesian framework we infer central densities and EoS properties for two choices of high-density extensions: a piecewise-polytropic model and a model based on assumptions of the speed of sound in dense matter. Around nuclear saturation density these extensions are matched to an EoS uncertainty band obtained from calculations based on chiral effective field theory interactions, which provide a realistic description of atomic nuclei as well as empirical nuclear matter properties within uncertainties. We further constrain EoS expectations with input from the current highest measured pulsar mass; together, these constraints offer a narrow Bayesian prior informed by theory as well as laboratory and astrophysical measurements. The NICER mass\u2013radius likelihood function derived by Riley et al. using pulse-profile modeling is consistent with the highest-density region of this prior. The present relatively large uncertainties on mass and radius for PSR J0030+0451 offer, however, only a weak posterior information gain over the prior. We explore the sensitivity to the inferred geometry of the heated regions that give rise to the pulsed emission, and find a small increase in posterior gain for an alternative (but less preferred) model. Lastly, we investigate the hypothetical scenario of increasing the NICER exposure time for PSR J0030+0451.", "doi": "10.3847/2041-8213/ab451a", "issn": "2041-8213", "publisher": "American Astronomical Society", "publication": "Astrophysical Journal Letters", "publication_date": "2019-12-10", "series_number": "1", "volume": "887", "issue": "1", "pages": "Art. No. L22" }, { "id": "authors:bmw6j-hxn23", "collection": "authors", "collection_id": "bmw6j-hxn23", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191213-105051551", "type": "article", "title": "Constraining the Neutron Star Mass\u2013Radius Relation and Dense Matter Equation of State with NICER. I. The Millisecond Pulsar X-Ray Data Set", "author": [ { "family_name": "Bogdanov", "given_name": "Slavko", "orcid": "0000-0002-9870-2742", "clpid": "Bogdanov-Slavko" }, { "family_name": "Guillot", "given_name": "Sebastien", "orcid": "0000-0002-6449-106X", "clpid": "Guillot-Sebastien" }, { "family_name": "Ray", "given_name": "Paul S.", "orcid": "0000-0002-5297-5278", "clpid": "Ray-Paul-S" }, { "family_name": "Wolff", "given_name": "Michael T.", "orcid": "0000-0002-4013-5650", "clpid": "Wolff-Michael-T" }, { "family_name": "Chakrabarty", "given_name": "Deepto", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" }, { "family_name": "Ho", "given_name": "Wynn C. G.", "orcid": "0000-0002-6089-6836", "clpid": "Ho-Wynn-C-G" }, { "family_name": "Kerr", "given_name": "Matthew", "orcid": "0000-0002-0893-4073", "clpid": "Kerr-Matthew" }, { "family_name": "Lamb", "given_name": "Frederick K.", "orcid": "0000-0002-3862-7402", "clpid": "Lamb-Frederick-K" }, { "family_name": "Lommen", "given_name": "Andrea", "orcid": "0000-0003-4137-7536", "clpid": "Lommen-A" }, { "family_name": "Ludlam", "given_name": "Renee M.", "orcid": "0000-0002-8961-939X", "clpid": "Ludlam-Renee-M" }, { "family_name": "Milburn", "given_name": "Reilly", "clpid": "Milburn-Reilly" }, { "family_name": "Montano", "given_name": "Sergio", "clpid": "Montano-Sergio" }, { "family_name": "Miller", "given_name": "M. Coleman", "orcid": "0000-0002-2666-728X", "clpid": "Miller-M-Coleman" }, { "family_name": "Baub\u00f6ck", "given_name": "Michi", "clpid": "Baub\u00f6ck-Michi" }, { "family_name": "\u00d6zel", "given_name": "Feryal", "clpid": "\u00d6zel-Feryal" }, { "family_name": "Psaltis", "given_name": "Dimitrios", "orcid": "0000-0003-4058-2837", "clpid": "Psaltis-Dimitrios" }, { "family_name": "Remillard", "given_name": "Ronald A.", "orcid": "0000-0003-4815-0481", "clpid": "Remillard-Ronald-A" }, { "family_name": "Riley", "given_name": "Thomas E.", "orcid": "0000-0001-9313-0493", "clpid": "Riley-Thomas-E" }, { "family_name": "Steiner", "given_name": "James F.", "orcid": "0000-0002-5872-6061", "clpid": "Steiner-James-F" }, { "family_name": "Strohmayer", "given_name": "Tod E.", "orcid": "0000-0001-7681-5845", "clpid": "Strohmayer-Tod-E" }, { "family_name": "Watts", "given_name": "Anna L.", "orcid": "0000-0002-1009-2354", "clpid": "Watts-Anna-L" }, { "family_name": "Wood", "given_name": "Kent S.", "orcid": "0000-0002-7376-3151", "clpid": "Wood-Kent-S" }, { "family_name": "Zeldes", "given_name": "Jesse", "clpid": "Zeldes-Jesse" }, { "family_name": "Enoto", "given_name": "Teruaki", "orcid": "0000-0003-1244-3100", "clpid": "Enoto-Teruaki" }, { "family_name": "Okajima", "given_name": "Takashi", "orcid": "0000-0002-6054-3432", "clpid": "Okajima-Takashi" }, { "family_name": "Kellogg", "given_name": "James W.", "clpid": "Kellogg-James-W" }, { "family_name": "Baker", "given_name": "Charles", "clpid": "Baker-Charles" }, { "family_name": "Markwardt", "given_name": "Craig B.", "orcid": "0000-0001-9803-3879", "clpid": "Markwardt-Craig-B" }, { "family_name": "Arzoumanian", "given_name": "Zaven", "clpid": "Arzoumanian-Zaven" }, { "family_name": "Gendreau", "given_name": "Keith C.", "orcid": "0000-0001-7115-2819", "clpid": "Gendreau-Keith-C" } ], "abstract": "We present the set of deep Neutron Star Interior Composition Explorer (NICER) X-ray timing observations of the nearby rotation-powered millisecond pulsars PSRs J0437\u22124715, J0030+0451, J1231\u22121411, and J2124\u22123358, selected as targets for constraining the mass\u2013radius relation of neutron stars and the dense matter equation of state (EoS) via modeling of their pulsed thermal X-ray emission. We describe the instrument, observations, and data processing/reduction procedures, as well as the series of investigations conducted to ensure that the properties of the data sets are suitable for parameter estimation analyses to produce reliable constraints on the neutron star mass\u2013radius relation and the dense matter EoS. We find that the long-term timing and flux behavior and the Fourier-domain properties of the event data do not exhibit any anomalies that could adversely affect the intended measurements. From phase-selected spectroscopy, we find that emission from the individual pulse peaks is well described by a single-temperature hydrogen atmosphere spectrum, with the exception of PSR J0437\u22124715, for which multiple temperatures are required.", "doi": "10.3847/2041-8213/ab53eb", "issn": "2041-8213", "publisher": "American Astronomical Society", "publication": "Astrophysical Journal Letters", "publication_date": "2019-12-10", "series_number": "1", "volume": "887", "issue": "1", "pages": "Art. No. L25" }, { "id": "authors:yn8bb-bhy23", "collection": "authors", "collection_id": "yn8bb-bhy23", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140703-221743755", "type": "book_section", "title": "Observations of Accreting Pulsars", "book_title": "The Evolution of X-Ray Binaries", "author": [ { "family_name": "Prince", "given_name": "Thomas A.", "orcid": "0000-0002-8850-3627", "clpid": "Prince-T-A" }, { "family_name": "Bildsten", "given_name": "Lars", "orcid": "0000-0001-8038-6836", "clpid": "Bildsten-Lars" }, { "family_name": "Chakrabarty", "given_name": "Deepto", "orcid": "0000-0001-8804-8946", "clpid": "Chakrabarty-Deepto" }, { "family_name": "Wilson", "given_name": "Robert B.", "clpid": "Wilson-Robert-B" }, { "family_name": "Finger", "given_name": "Mark H.", "clpid": "Finger-Mark-H" } ], "abstract": "We discuss recent observations of accreting binary pulsars with the all-sky BATSE instrument on the Compton Gamma Ray Observatory. BATSE has detected and studied nearly half of the known accreting pulsar systems. Continuous timing studies over a two-year period have yielded accurate orbital parameters for 9 of these systems, as well as new insights into long-term accretion torque histories.", "doi": "10.1063/1.46016", "isbn": "1-56396-329-9", "publisher": "American Institute of Physics", "place_of_publication": "Melville, NY", "publication_date": "1994-07-05", "pages": "235-244" } ]