OGLE-2015-BLG-0479LA,B: BINARY GRAVITATIONAL MICROLENS CHARACTERIZED BY SIMULTANEOUS GROUND-BASED AND SPACE-BASED OBSERVATIONS
文献类型：期刊论文
| 作者 | Han, C.1; Udalski, A.2; Gould, A.3,4; Zhu, Wei3; Street, R. A.5; Yee, J. C.6; Beichman, C.7; Bryden, C.8; Novati, S. Calchi9,10; Carey, S.11 |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2016-09-01 |
| 卷号 | 828期号:1 |
| 关键词 | binaries: general gravitational lensing: micro |
| 英文摘要 | We present a combined analysis of the observations of the gravitational microlensing event OGLE-2015-BLG-0479 taken both from the ground and by the Spitzer Space Telescope. The light curves seen from the ground and from space exhibit a time offset of similar to 13 days between the caustic spikes, indicating that the relative lens-source positions seen from the two places are displaced by parallax effects. From modeling the light curves, we measure the space-based microlens parallax. Combined with the angular Einstein radius measured by analyzing the caustic crossings, we determine the mass and distance of the lens. We find that the lens is a binary composed of two G-type stars with masses of similar to 1.0 M-circle dot and similar to 0.9 M-circle dot located at a distance. of similar to 3 kpc. In addition, we are able to constrain the complete orbital parameters of the lens thanks to the precise measurement of the microlens parallax derived from the joint analysis. In contrast to the binary event OGLE-2014-BLG-1050, which was also observed by Spitzer, we find that the interpretation of OGLE-2015-BLG-0479 does not suffer from the degeneracy between (+/-, +/-) and (+/-, -/+) solutions, confirming that the four-fold parallax degeneracy in single-lens events collapses into the two-fold degeneracy for the general case of binary-lens events. The location of the blend in the color-magnitude diagram is consistent with the lens properties, suggesting that the blend is the lens itself. The blend is bright enough for spectroscopy and thus this possibility can be checked from future follow-up observations. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | DIFFERENCE IMAGE-ANALYSIS ; PARALLAX SATELLITE MASS ; LENSING EXPERIMENT ; PLANET PHOTOMETRY ; GALACTIC BULGE ; OGLE-III ; SPITZER ; EVENTS ; STARS ; DISTANCES |
| 收录类别 | SCI |
| 语种 | 英语 |
| WOS记录号 | WOS:000386894900053 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/6873]  |
| 专题 | 国家天文台_星系宇宙学研究部 |
| 作者单位 | 1.Chungbuk Natl Univ, Dept Phys, Cheongju 361763, South Korea 2.Univ Warsaw Observ, Al Ujazdowskie 4, PL-00478 Warsaw, Poland 3.Ohio State Univ, Dept Astron, 140 W 18th Ave, Columbus, OH 43210 USA 4.Max Planck Inst Astron, Konigstuhl 17, D-69117 Heidelberg, Germany 5.Queen Mary Univ London, Sch Phys & Astron, Mile End Rd, London E1 4NS, England 6.Harvard Smithsonian Ctr Astrophys, 60 Garden St, Cambridge, MA 02138 USA 7.CALTECH, NASA, Exoplanet Sci Inst, MS 100-22, Pasadena, CA 91125 USA 8.CALTECH, Jet Prop Lab, 4800 Oak Grove Dr, Pasadena, CA 91109 USA 9.Univ Salerno, Dipartimento Fis ER Caianiello, Via Giovanni Paolo II, I-84084 Fisciano, SA, Italy 10.IIASS, Via G Pellegrino 19, I-84019 Vietri Sul Mare, SA, Italy |
| 推荐引用方式 GB/T 7714 | Han, C.,Udalski, A.,Gould, A.,et al. OGLE-2015-BLG-0479LA,B: BINARY GRAVITATIONAL MICROLENS CHARACTERIZED BY SIMULTANEOUS GROUND-BASED AND SPACE-BASED OBSERVATIONS[J]. ASTROPHYSICAL JOURNAL,2016,828(1). |
| APA | Han, C..,Udalski, A..,Gould, A..,Zhu, Wei.,Street, R. A..,...&Fun Collaboration.(2016).OGLE-2015-BLG-0479LA,B: BINARY GRAVITATIONAL MICROLENS CHARACTERIZED BY SIMULTANEOUS GROUND-BASED AND SPACE-BASED OBSERVATIONS.ASTROPHYSICAL JOURNAL,828(1). |
| MLA | Han, C.,et al."OGLE-2015-BLG-0479LA,B: BINARY GRAVITATIONAL MICROLENS CHARACTERIZED BY SIMULTANEOUS GROUND-BASED AND SPACE-BASED OBSERVATIONS".ASTROPHYSICAL JOURNAL 828.1(2016). |
入库方式： OAI收割
来源：国家天文台
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