[ { "id": "authors:71g4j-p8e53", "collection": "authors", "collection_id": "71g4j-p8e53", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20151109-142649174", "type": "article", "title": "Spitzer IRAC Photometry for Time Series in Crowded Fields", "author": [ { "family_name": "Calchi Novati", "given_name": "S.", "orcid": "0000-0002-7669-1069", "clpid": "Calchi-Novati-S" }, { "family_name": "Gould", "given_name": "A.", "clpid": "Gould-A" }, { "family_name": "Yee", "given_name": "J. C.", "orcid": "0000-0001-9481-7123", "clpid": "Yee-Jennifer-C" }, { "family_name": "Beichman", "given_name": "C.", "orcid": "0000-0002-5627-5471", "clpid": "Beichman-C-A" }, { "family_name": "Bryden", "given_name": "G.", "clpid": "Bryden-G" }, { "family_name": "Carey", "given_name": "S.", "orcid": "0000-0002-0221-6871", "clpid": "Carey-S-J" }, { "family_name": "Fausnaugh", "given_name": "M.", "clpid": "Fausnaugh-M" }, { "family_name": "Gaudi", "given_name": "B. S.", "orcid": "0000-0003-0395-9869", "clpid": "Gaudi-B-S" }, { "family_name": "Henderson", "given_name": "C. B.", "orcid": "0000-0001-8877-9060", "clpid": "Henderson-C-B" }, { "family_name": "Pogge", "given_name": "R. W.", "orcid": "0000-0003-1435-3053", "clpid": "Pogge-R-W" }, { "family_name": "Shvartzvald", "given_name": "Y.", "orcid": "0000-0003-1525-5041", "clpid": "Shvartzvald-Y" }, { "family_name": "Wibking", "given_name": "B.", "clpid": "Wibking-B" }, { "family_name": "Zhu", "given_name": "W.", "clpid": "Zhu-W" }, { "family_name": "Udalski", "given_name": "A.", "orcid": "0000-0001-5207-5619", "clpid": "Udalski-A" }, { "family_name": "Poleski", "given_name": "R.", "orcid": "0000-0002-9245-6368", "clpid": "Poleski-R" }, { "family_name": "Pawlak", "given_name": "M.", "clpid": "Pawlak-M" }, { "family_name": "Szyma\u0144ski", "given_name": "M. K.", "clpid": "Szyma\u0144ski-M-K" }, { "family_name": "Skowron", "given_name": "J.", "orcid": "0000-0002-2335-1730", "clpid": "Skowron-J" }, { "family_name": "Mr\u00f3z", "given_name": "P.", "orcid": "0000-0001-7016-1692", "clpid": "Mr\u00f3z-Przemek" }, { "family_name": "Koz\u0142owski", "given_name": "S.", "clpid": "Koz\u0142owski-S" }, { "family_name": "Wyrzykowski", "given_name": "\u0141.", "clpid": "Wyrzykowski-\u0141" }, { "family_name": "Pietrukowicz", "given_name": "P.", "orcid": "0000-0002-2339-5899", "clpid": "Pietrukowicz-P" }, { "family_name": "Pietrzy\u0144ski", "given_name": "G.", "clpid": "Pietrzy\u0144ski-G" }, { "family_name": "Soszy\u0144ski", "given_name": "I.", "clpid": "Soszy\u0144ski-I" }, { "family_name": "Ulaczyk", "given_name": "K.", "orcid": "0000-0001-6364-408X", "clpid": "Ulaczyk-K" }, { "literal": "Spitzer Team" }, { "literal": "OGLE Group" } ], "abstract": "We develop a new photometry algorithm that is optimized for the Infrared Array Camera (IRAC) Spitzer time series in crowded fields and that is particularly adapted to faint or heavily blended targets. We apply this to the 170 targets from the 2015 Spitzer microlensing campaign and present the results of three variants of this algorithm in an online catalog. We present detailed accounts of the application of this algorithm to two difficult cases, one very faint and the other very crowded. Several of Spitzer's instrumental characteristics that drive the specific features of this algorithm are shared by Kepler and WFIRST, implying that these features may prove to be a useful starting point for algorithms designed for microlensing campaigns by these other missions.", "doi": "10.1088/0004-637X/814/2/92", "issn": "0004-637X", "publisher": "American Astronomical Society", "publication": "Astrophysical Journal", "publication_date": "2015-12-01", "series_number": "2", "volume": "814", "issue": "2", "pages": "Art. No. 92" }, { "id": "authors:8t89n-b8138", "collection": "authors", "collection_id": "8t89n-b8138", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20150309-083325747", "type": "article", "title": "Spitzer as a Microlens Parallax Satellite: Mass Measurement for the OGLE-2014-BLG-0124L Planet and its Host Star", "author": [ { "family_name": "Udalski", "given_name": "A.", "orcid": "0000-0001-5207-5619", "clpid": "Udalski-A" }, { "family_name": "Yee", "given_name": "J. C.", "orcid": "0000-0001-9481-7123", "clpid": "Yee-Jennifer-C" }, { "family_name": "Gould", "given_name": "A.", "clpid": "Gould-A-P" }, { "family_name": "Carey", "given_name": "S.", "orcid": "0000-0002-0221-6871", "clpid": "Carey-S-J" }, { "family_name": "Zhu", "given_name": "W.", "clpid": "Zhu-W" }, { "family_name": "Skowron", "given_name": "J.", "orcid": "0000-0002-2335-1730", "clpid": "Skowron-J" }, { "family_name": "Koz\u0142owski", "given_name": "S.", "clpid": "Koz\u0142owski-S" }, { "family_name": "Poleski", "given_name": "R.", "orcid": "0000-0002-9245-6368", "clpid": "Poleski-R" }, { "family_name": "Pietrukowicz", "given_name": "P.", "orcid": "0000-0002-2339-5899", "clpid": "Pietrukowicz-P" }, { "family_name": "Pietrzy\u0144ski", "given_name": "G.", "clpid": "Pietrzy\u0144ski-G" }, { "family_name": "Szyma\u0144ski", "given_name": "M. K.", "clpid": "Szyma\u0144ski-M-K" }, { "family_name": "Mr\u00f3z", "given_name": "P.", "orcid": "0000-0001-7016-1692", "clpid": "Mr\u00f3z-Przemek" }, { "family_name": "Soszy\u0144ski", "given_name": "I.", "clpid": "Soszy\u0144ski-I" }, { "family_name": "Ulaczyk", "given_name": "K.", "orcid": "0000-0001-6364-408X", "clpid": "Ulaczyk-K" }, { "family_name": "Wyrzykowski", "given_name": "\u0141.", "clpid": "Wyrzykowski-\u0141" }, { "family_name": "Han", "given_name": "C.", "clpid": "Han-C" }, { "family_name": "Calchi Novati", "given_name": "S.", "orcid": "0000-0002-7669-1069", "clpid": "Calchi-Novati-S" }, { "family_name": "Pogge", "given_name": "R. W.", "orcid": "0000-0003-1435-3053", "clpid": "Pogge-R-W" } ], "abstract": "We combine Spitzer and ground-based observations to measure the microlens parallax vector \u03c0_E, and thus the mass and distance of OGLE-2014-BLG-0124L, making it the first microlensing planetary system with a space-based parallax measurement. The planet and star have masses of m ~ 0.5 M_(jup) and M ~ 0.7 M_\u2609 and are separated by a_\u22a5 ~ 3.1 AU in projection. The main source of uncertainty in all of these numbers (approximately 30%, 30%, and 20%) is the relatively poor measurement of the Einstein radius \u03b8_E, rather than uncertainty in \u03c0_E, which is measured with 2.5% precision. This compares to 22% based on OGLE data alone, implying that the Spitzer data provide not only a substantial improvement in the precision of the \u03c0_E measurement, but also the first independent test of a ground-based \u03c0_E measurement.", "doi": "10.1088/0004-637X/799/2/237", "issn": "0004-637X", "publisher": "American Astronomical Society", "publication": "Astrophysical Journal", "publication_date": "2015-02-01", "series_number": "2", "volume": "799", "issue": "2", "pages": "Art. No. 237" }, { "id": "authors:s9rf6-4zt20", "collection": "authors", "collection_id": "s9rf6-4zt20", "cite_using_url": "https://resolver.caltech.edu/CaltechAUTHORS:20200221-155049786", "type": "article", "title": "Nonlinearly Viscoelastic Behavior of Polycarbonate. II. The Role of Volumetric Strain", "author": [ { "family_name": "Knauss", "given_name": "W. G.", "clpid": "Knauss-W-G" }, { "family_name": "Zhu", "given_name": "W.", "clpid": "Zhu-W" } ], "abstract": "The creep responses of (bisphenol A) polycarbonate at 80\u00b0C undercombined two-dimensional shear with superposed tensile and compressivestress states were measured on Arcan specimens in the nonlinearlyviscoelastic regime. Of particular interest is the influence of thedilatational deformation component on the nonlinearly viscoelastic creepbehavior. Because the nonlinear material response determines the stressdistribution under fixed deformation or load, but is not known a priori,a re-estimation of the latter is essential to verify or adjust thestress state(s). This is accomplished by approximating isochronalstress-strain relations derived from shear creep behavior, encompassingthe nonlinear domain, by a classical incremental elasto-plastic materialdescription at appropriate times. To the extent that the two-dimensionalcharacter of the test configuration permits accessing three-dimensionalinformation, a coherent representation of the results is examined interms of maximum shear and/or octahedral representation.\n\nIt is found that the creep behavior under shear and normal stressor deformation imposition differ significantly: When viewed as aresponse to the imposition of a maximum shear stress, the creepresponses differ depending on whether one or the other dominates. On theother hand, if the response is formulated in terms of an octahedraldescription the representation becomes less sensitive to normal vs.shear behavior. It is clear in either case, however, that normal strainhas a disproportionately large effect on creep response in shear. Withinthe precision underlying the measurements it is found that the shear andnormal strain components accumulate under creep in nearly constantratios. Under this scenario it is demonstrated clearly that theinfluence of negative dilatational stress (or deformation) on pure sheardeformation leads to distinctly lower creep rates. The converse is true,if positive dilatational stresses are added, though not monotonically so.", "doi": "10.1023/a:1021296110580", "issn": "1385-2000", "publisher": "Springer", "publication": "Mechanics of Time-Dependent Materials", "publication_date": "2002-12", "series_number": "4", "volume": "6", "issue": "4", "pages": "301-322" } ]