CHARACTERIZING LOW-MASS BINARIES FROM OBSERVATION OF LONG-TIMESCALE CAUSTIC-CROSSING GRAVITATIONAL MICROLENSING EVENTS
文献类型：期刊论文
| 作者 | Shin, IG; Han, C; Choi, JY; Udalski, A; Sumi, T; Gould, A; Bozza, V; Dominik, M; Fouque, P; Horne, K |
| 刊名 | ASTROPHYSICAL JOURNAL
 |
| 出版日期 | 2012-08-20 |
| 卷号 | 755期号:2 |
| 关键词 | binaries: general gravitational lensing: micro |
| ISSN号 | 0004-637X |
| 产权排序 | 第二十九完成单位 |
| 通讯作者 | Shin, IG (reprint author), Chungbuk Natl Univ, Inst Astrophys, Dept Phys, Cheongju 371763, South Korea. |
| 英文摘要 | Despite the astrophysical importance of binary star systems, detections are limited to those located in small ranges of separations, distances, and masses and thus it is necessary to use a variety of observational techniques for a complete view of stellar multiplicity across a broad range of physical parameters. In this paper, we report the detections and measurements of two binaries discovered from observations of microlensing events MOA-2011-BLG-090 and OGLE-2011-BLG-0417. Determinations of the binary masses are possible by simultaneously measuring the Einstein radius and the lens parallax. The measured masses of the binary components are 0.43M(circle dot) and 0.39M(circle dot) for MOA-2011-BLG-090 and 0.57M(circle dot) and 0.17M(circle dot) for OGLE-2011-BLG-0417 and thus both lens components of MOA-2011-BLG-090 and one component of OGLE-2011-BLG-0417 are M dwarfs, demonstrating the usefulness of microlensing in detecting binaries composed of low-mass components. From modeling of the light curves considering full Keplerian motion of the lens, we also measure the orbital parameters of the binaries. The blended light of OGLE-2011-BLG-0417 comes very likely from the lens itself, making it possible to check the microlensing orbital solution by follow-up radial-velocity observation. For both events, the caustic-crossing parts of the light curves, which are critical for determining the physical lens parameters, were resolved by high-cadence survey observations and thus it is expected that the number of microlensing binaries with measured physical parameters will increase in the future. |
| WOS标题词 | Science & Technology ; Physical Sciences |
| 学科主题 | Astronomy & Astrophysics |
| 类目[WOS] | Astronomy & Astrophysics |
| 研究领域[WOS] | Astronomy & Astrophysics |
| 关键词[WOS] | SOLAR-TYPE STARS ; LENS ; PHOTOMETRY ; SYSTEMS ; MULTIPLICITY ; RESOLUTION ; ROTATION ; DISTANCE ; PLANETS ; SEARCH |
| 收录类别 | SCI |
| 原文出处 | http://iopscience.iop.org/article/10.1088/0004-637X/755/2/91/meta |
| 语种 | 英语 |
| WOS记录号 | WOS:000307791400008 |
| 源URL | [http://ir.ynao.ac.cn/handle/114a53/5218]  |
| 专题 | 云南天文台_恒星物理研究组 |
| 推荐引用方式 GB/T 7714 | Shin, IG,Han, C,Choi, JY,et al. CHARACTERIZING LOW-MASS BINARIES FROM OBSERVATION OF LONG-TIMESCALE CAUSTIC-CROSSING GRAVITATIONAL MICROLENSING EVENTS[J]. ASTROPHYSICAL JOURNAL,2012,755(2). |
| APA | Shin, IG.,Han, C.,Choi, JY.,Udalski, A.,Sumi, T.,...&Zub, M.(2012).CHARACTERIZING LOW-MASS BINARIES FROM OBSERVATION OF LONG-TIMESCALE CAUSTIC-CROSSING GRAVITATIONAL MICROLENSING EVENTS.ASTROPHYSICAL JOURNAL,755(2). |
| MLA | Shin, IG,et al."CHARACTERIZING LOW-MASS BINARIES FROM OBSERVATION OF LONG-TIMESCALE CAUSTIC-CROSSING GRAVITATIONAL MICROLENSING EVENTS".ASTROPHYSICAL JOURNAL 755.2(2012). |
入库方式： OAI收割
来源：云南天文台
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