[ { "id": "authors:swmhf-anr14", "collection": "authors", "collection_id": "swmhf-anr14", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200807-090348710", "type": "article", "title": "A Catalog of Short Period Spectroscopic and Eclipsing Binaries Identified from the LAMOST and PTF Surveys", "author": [ { "family_name": "Yang", "given_name": "Fan", "orcid": "0000-0002-6039-8212", "clpid": "Yang-Fan" }, { "family_name": "Long", "given_name": "Richard J.", "orcid": "0000-0002-8559-0067", "clpid": "Long-R-J" }, { "family_name": "Shan", "given_name": "Su-Su", "orcid": "0000-0002-5744-2016", "clpid": "Shan-Su-Su" }, { "family_name": "Zhang", "given_name": "Bo", "orcid": "0000-0002-6434-7201", "clpid": "Zhang-Bo" }, { "family_name": "Guo", "given_name": "Rui", "clpid": "Guo-Rui" }, { "family_name": "Bai", "given_name": "Yu", "orcid": "0000-0002-4740-3857", "clpid": "Bai-Yu" }, { "family_name": "Bai", "given_name": "Zhongrui", "orcid": "0000-0003-3884-5693", "clpid": "Bai-Zhongrui" }, { "family_name": "Cui", "given_name": "Kai-Ming", "clpid": "Cui-Kai-Ming" }, { "family_name": "Wang", "given_name": "Song", "orcid": "0000-0003-3116-5038", "clpid": "Wang-Song" }, { "family_name": "Liu", "given_name": "Ji-Feng", "clpid": "Liu-Ji-Feng" } ], "abstract": "Binaries play key roles in determining stellar parameters and exploring stellar evolution models. We build a catalog of 88 eclipsing binaries with spectroscopic information, taking advantage of observations from both the Large Sky Area Multi-Object fiber Spectroscopic Telescope and the Palomar Transient Factory surveys. A software pipeline is constructed to identify binary candidates by examining their light curves. The orbital periods of binaries are derived from the Lomb\u2013Scargle method. The key distinguishing features of eclipsing binaries are recognized by a new filter, Flat Test. We classify the eclipsing binaries by applying a Fourier analysis on the light curves. Among all the binary stars, 13 binaries are identified as eclipsing binaries for the first time. The catalog contains the following information: the position, primary eclipsing magnitude and time, eclipsing depth, the number of photometry and radial velocity observations, largest radial velocity difference, binary type, the effective temperature of the observable star T eff, and surface gravity of the observable star log g. The false-positive probability is calculated by using both a Monte Carlo simulation and real data from the Sloan Digital Sky Survey Stripe 82 Standard Catalog. The binaries in the catalog are mostly with a period of less than one day. The period distribution shows a 0.22 day cutoff, which is consistent with the low probability of an eclipsing binary rotating with such a period.", "doi": "10.3847/1538-4365/ab9b77", "issn": "1538-4365", "publisher": "American Astronomical Society", "publication": "Astrophysical Journal Supplement Series", "publication_date": "2020-08", "series_number": "2", "volume": "249", "issue": "2", "pages": "Art. No. 31" }, { "id": "authors:rs2g8-tch43", "collection": "authors", "collection_id": "rs2g8-tch43", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20191011-115115754", "type": "article", "title": "Searching for Black Hole Candidates by LAMOST and ASAS-SN", "author": [ { "family_name": "Zheng", "given_name": "Ling-Lin", "clpid": "Zheng-Ling-Lin" }, { "family_name": "Gu", "given_name": "Wei-Min", "orcid": "0000-0003-3137-1851", "clpid": "Gu-Wei-Min" }, { "family_name": "Yi", "given_name": "Tuan", "clpid": "Yi-Tuan" }, { "family_name": "Fu", "given_name": "Jin-Bo", "clpid": "Fu-Jin-Bo" }, { "family_name": "Mu", "given_name": "Hui-Jun", "orcid": "0000-0001-6589-2220", "clpid": "Mu-Hui-Jun" }, { "family_name": "Yang", "given_name": "Fan", "clpid": "Yang-Fan" }, { "family_name": "Wang", "given_name": "Song", "orcid": "0000-0003-3116-5038", "clpid": "Wang-Song" }, { "family_name": "Bai", "given_name": "Zhong-Rui", "clpid": "Bai-Zhong-Rui" }, { "family_name": "Sou", "given_name": "Hao", "clpid": "Sou-Hao" }, { "family_name": "Bai", "given_name": "Yu", "orcid": "0000-0002-4740-3857", "clpid": "Bai-Yu" }, { "family_name": "Dong", "given_name": "Yi-Ze", "clpid": "Dong-Yi-Ze" }, { "family_name": "Zhang", "given_name": "Hao-Tong", "clpid": "Zhang-Hao-Tong" }, { "family_name": "Lei", "given_name": "Ya-Juan", "clpid": "Lei-Ya-Juan" }, { "family_name": "Wang", "given_name": "Junfeng", "orcid": "0000-0003-4874-0369", "clpid": "Wang-Junfeng" }, { "family_name": "Wu", "given_name": "Jianfeng", "clpid": "Wu-Jianfeng" }, { "family_name": "Liu", "given_name": "Jifeng", "clpid": "Liu-Jifeng" } ], "abstract": "Most dynamically confirmed stellar-mass black holes (BHs) and their candidates were originally selected from X-ray outbursts. In the present work, we search for BH candidates in the Large Sky Area Multi-Object Fiber Spectroscopic Telescope (LAMOST) survey using the spectra along with photometry from the All Sky Automated Survey for SuperNovae (ASAS-SN), where the orbital period of the binary may be revealed by the periodic light curve, such as the ellipsoidal modulation type. Our sample consists of nine binaries, where each source contains a giant star with large radial velocity variation (\u0394V_R \u2273 70 km s^(-1)) and periods known from light curves. We focus on the nine sources with long periods (T_(ph) > 5 days) and evaluate the mass M_2 of the optically invisible companion. Since the observed \u0394V_R from only a few repeating spectroscopic observations is a lower limit of the real amplitude, the real mass M_2 can be significantly higher than the current evaluation. It is likely an efficient method to place constraints on M 2 by combining \u0394V_R from LAMOST and T_(ph) from ASAS-SN, particularly by the ongoing LAMOST Medium Resolution Survey.", "doi": "10.3847/1538-3881/ab449f", "issn": "1538-3881", "publisher": "American Astronomical Society", "publication": "Astronomical Journal", "publication_date": "2019-11", "series_number": "5", "volume": "158", "issue": "5", "pages": "Art. No. 179" }, { "id": "authors:jr2ks-5rx15", "collection": "authors", "collection_id": "jr2ks-5rx15", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150922-214601520", "type": "article", "title": "Relativistic baryonic jets from an ultraluminous supersoft X-ray source", "author": [ { "family_name": "Liu", "given_name": "Ji-Feng", "clpid": "Liu-Ji-Feng" }, { "family_name": "Bai", "given_name": "Yu", "orcid": "0000-0002-4740-3857", "clpid": "Bai-Yu" }, { "family_name": "Wang", "given_name": "Song", "orcid": "0000-0003-3116-5038", "clpid": "Wang-Song" }, { "family_name": "Justham", "given_name": "Stephen", "clpid": "Justham-S" }, { "family_name": "Lu", "given_name": "You-Jun", "clpid": "Lu-You-Jun" }, { "family_name": "Gu", "given_name": "Wei-Min", "orcid": "0000-0003-3137-1851", "clpid": "Gu-Wei-Min" }, { "family_name": "Liu", "given_name": "Qing-Zhong", "clpid": "Liu-Qing-Zhong" }, { "family_name": "Di Stefano", "given_name": "Rosanne", "clpid": "Di-Stefano-R" }, { "family_name": "Guo", "given_name": "Jin-Cheng", "clpid": "Guo-Jin-Cheng" }, { "family_name": "Cabrera-Lavers", "given_name": "Antonio", "clpid": "Cabrera-Lavers-A" }, { "family_name": "\u00c1lvarez", "given_name": "Pedro", "clpid": "\u00c1lvarez-P" }, { "family_name": "Cao", "given_name": "Yi", "orcid": "0000-0002-8036-8491", "clpid": "Cao-Yi" }, { "family_name": "Kulkarni", "given_name": "Shri", "orcid": "0000-0001-5390-8563", "clpid": "Kulkarni-S-R" } ], "abstract": "The formation of relativistic jets by an accreting compact object is one of the fundamental mysteries of astrophysics. Although the theory is poorly understood, observations of relativistic jets from systems known as microquasars (compact binary stars) have led to a well established phenomenology. Relativistic jets are not expected to be produced by sources with soft or supersoft X-ray spectra, although two such systems are known to produce relatively low-velocity bipolar outflows. Here we report the optical spectra of an ultraluminous supersoft X-ray source (ULS) in the nearby galaxy M81 (M81 ULS-1; refs 9, 10). Unexpectedly, the spectra show blueshifted, broad H\u03b1 emission lines, characteristic of baryonic jets with relativistic speeds. These time-variable emission lines have projected velocities of about 17 per cent of the speed of light, and seem to be similar to those from the prototype microquasar SS 433 (refs 11, 12). Such relativistic jets are not expected to be launched from white dwarfs, and an origin from a black hole or a neutron star is hard to reconcile with the persistence of M81 ULS-1's soft X-rays. Thus the unexpected presence of relativistic jets in a ULS challenges canonical theories of jet formation3, 4, but might be explained by a long-speculated, supercritically accreting black hole with optically thick outflows.", "doi": "10.1038/nature15751", "issn": "0028-0836", "publisher": "Nature Publishing Group", "publication": "Nature", "publication_date": "2015-12-03", "series_number": "7580", "volume": "528", "issue": "7580", "pages": "108-110" }, { "id": "authors:dxn8p-p4989", "collection": "authors", "collection_id": "dxn8p-p4989", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111019-072552735", "type": "article", "title": "A Cuspidality Criterion for the Functorial Product\n on GL(2) \u00d7 GL(3) with a Cohomological Application", "author": [ { "family_name": "Ramakrishnan", "given_name": "Dinakar", "orcid": "0000-0002-0159-087X", "clpid": "Ramakrishnan-D" }, { "family_name": "Wang", "given_name": "Song", "orcid": "0000-0003-3116-5038", "clpid": "Wang-Song" } ], "abstract": "For all cusp forms \u03c0 on GL(3) and \u03c0\u2032 on GL(2) over a number field F, H. Kim and F. Shahidi have functorially associated an automorphic form Formula on GL(6) such that L(s, \u03a0) agrees with the Rankin-Selberg L-function of the pair (\u03c0, \u03c0\u2032). First we establish a criterion as to when \u03a0 is cuspidal. Then we apply it to construct non-self-dual, nonmonomial cuspidal cohomology classes for suitable congruence subgroups of SL(3, \u2124). We also analyze the Galois image of certain related \u2113-adic representations.", "doi": "10.1155/S1073792804132856", "issn": "1073-7928", "publisher": "Oxford University Press", "publication": "International Mathematics Research Notices", "publication_date": "2004", "series_number": "27", "volume": "2004", "issue": "27", "pages": "1355-1394" }, { "id": "authors:00940-v9565", "collection": "authors", "collection_id": "00940-v9565", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20111026-134851953", "type": "article", "title": "On the Exceptional Zeros of Rankin\u2013Selberg L-Functions", "author": [ { "family_name": "Ramakrishnan", "given_name": "Dinakar", "orcid": "0000-0002-0159-087X", "clpid": "Ramakrishnan-D" }, { "family_name": "Wang", "given_name": "Song", "orcid": "0000-0003-3116-5038", "clpid": "Wang-Song" } ], "abstract": "The main objects of study in this article are two classes of Rankin\u2013Selberg L-functions, namely L(s,\u0192\u00d7g) and L(s, sym^2(g)\u00d7 sym^2(g)), where \u0192, g are newforms, holomorphic or of Maass type, on the upper half plane, and sym^2(g) denotes the symmetric square lift of g to GL(3). We prove that in general, i.e., when these L-functions are not divisible by L-functions of quadratic characters (such divisibility happening rarely), they do not admit any LandauSiegel zeros. Such zeros, which are real and close to s=1, are highly mysterious and are not expected to occur. There are corollaries of our result, one of them being a strong lower bound for special value at s=1, which is of interest both geometrically and analytically. One also gets this way a good bound on the norm of sym^2(g).", "doi": "10.1023/A:1021761421232", "issn": "0010-437X", "publisher": "Cambridge University Press", "publication": "Compositio Mathematica", "publication_date": "2003-01", "series_number": "2", "volume": "135", "issue": "2", "pages": "211-244" }, { "id": "authors:pa2k0-f0469", "collection": "authors", "collection_id": "pa2k0-f0469", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20140703-213516158", "type": "article", "title": "GRIP-2: A Sensitive Balloon-borne Imaging Gamma-ray Telescope", "author": [ { "family_name": "Schindler", "given_name": "Stephen M.", "clpid": "Schindler-S-M" }, { "family_name": "Cook", "given_name": "Walter R.", "clpid": "Cook-W-R" }, { "family_name": "Hammond", "given_name": "Jeffrey", "clpid": "Hammond-J" }, { "family_name": "Harrison", "given_name": "Fiona A.", "orcid": "0000-0002-4226-8959", "clpid": "Harrison-F-A" }, { "family_name": "Prince", "given_name": "Thomas A.", "orcid": "0000-0002-8850-3627", "clpid": "Prince-T-A" }, { "family_name": "Wang", "given_name": "Song", "orcid": "0000-0003-3116-5038", "clpid": "Wang-Song" }, { "family_name": "Corbel", "given_name": "St\u00e9phane", "clpid": "Corbel-S" }, { "family_name": "Heindl", "given_name": "William A.", "clpid": "Heindl-W-A" } ], "abstract": "This paper describes the balloon-borne coded-aperture telescope, GRIP-2, which is designed for imaging observations of astrophysical sources in the 30 keV-2 MeV band. GRIP-2 employs the rotating hexagonal coded-mask imaging technique pioneered by the Caltech GRIP-1 [Cook et al., IEEE Trans. Nucl. Sci. NS-31 (1984) 771] instrument. GRIP-2 has an angular resolution of 33\u2032 over a 15\u00b0 FWHM field of view. A large (3850 cm^2 geometric area) NaI(Tl)/CsI(Na) phoswich detector provides excellent source detection sensitivity. We describe here the instrument design, performance, and preliminary results from the first two balloon flights.", "doi": "10.1016/S0168-9002(96)00926-6", "issn": "0168-9002", "publisher": "Elsevier", "publication": "Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment", "publication_date": "1997-01", "series_number": "2-3", "volume": "384", "issue": "2-3", "pages": "425-434" } ]