Spitzer Microlensing Parallax Reveals Two Isolated Stars in the Galactic Bulge
文献类型：期刊论文
| 作者 | Zang,Weicheng3; Shvartzvald,Yossi4; Wang,Tianshu3; Udalski,Andrzej5; Lee,Chung-Uk6,7; Sumi,Takahiro8; Skottfelt,Jesper9; Li,Shun-Sheng10,11; Mao,Shude3,10 ; Zhu,Wei12
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| 刊名 | The Astrophysical Journal
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| 出版日期 | 2020-02-27 |
| 卷号 | 891期号:1 |
| ISSN号 | 0004-637X |
| 关键词 | Gravitational microlensing Satellite microlensing parallax Stellar masses Stellar distance |
| DOI | 10.3847/1538-4357/ab6ff8 |
| 英文摘要 | Abstract We report the mass and distance measurements of two single-lens events from the 2017 Spitzer microlensing campaign. The ground-based observations yield the detection of finite-source effects, and the microlens parallaxes are derived from the joint analysis of ground-based observations and Spitzer observations. We find that the lens of OGLE-2017-BLG-1254 is a 0.60?±?0.03 M⊙ star with DLS?=?0.53?±?0.11 kpc, where DLS is the distance between the lens and the source. The second event, OGLE-2017-BLG-1161, is subject to the known satellite parallax degeneracy, and thus is either a star with DLS?=?0.40?±?0.12 kpc or a star with DLS?=?0.53?±?0.19 kpc. Both of the lenses are therefore isolated stars in the Galactic bulge. By comparing the mass and distance distributions of the eight published Spitzer finite-source events with the expectations from a Galactic model, we find that the Spitzer sample is in agreement with the probability of finite-source effects occurring in single-lens events. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-637X-891-1-AB6FF8 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/53986]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.School of Physics and Astronomy, Tel-Aviv University, Tel-Aviv 6997801, Israel 2.Center for Astrophysics∣Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA 3.Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, People’s Republic of China zangwc17@mails.tsinghua.edu.cn 4.IPAC, Mail Code 100-22, Caltech, 1200 E. California Blvd., Pasadena, CA 91125, USA 5.Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland 6.Korea Astronomy and Space Science Institute, Daejon 34055, Republic of Korea 7.University of Science and Technology, Korea, (UST), 217 Gajeong-ro Yuseong-gu, Daejeon 34113, Republic of Korea 8.Department of Earth and Space Science, Graduate School of Science, Osaka University, Toyonaka, Osaka 560-0043, Japan 9.Centre for Electronic Imaging, Department of Physical Sciences, The Open University, Milton Keynes, MK7 6AA, UK 10.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People’s Republic of China |
| 推荐引用方式 GB/T 7714 | Zang,Weicheng,Shvartzvald,Yossi,Wang,Tianshu,et al. Spitzer Microlensing Parallax Reveals Two Isolated Stars in the Galactic Bulge[J]. The Astrophysical Journal,2020,891(1). |
| APA | Zang,Weicheng.,Shvartzvald,Yossi.,Wang,Tianshu.,Udalski,Andrzej.,Lee,Chung-Uk.,...&Essen,Carolina von.(2020).Spitzer Microlensing Parallax Reveals Two Isolated Stars in the Galactic Bulge.The Astrophysical Journal,891(1). |
| MLA | Zang,Weicheng,et al."Spitzer Microlensing Parallax Reveals Two Isolated Stars in the Galactic Bulge".The Astrophysical Journal 891.1(2020). |
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来源：国家天文台
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