Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf
文献类型：期刊论文
| 作者 | Jung,Youn Kil34; Gould,Andrew32,33,34; Udalski,Andrzej31; Sumi,Takahiro30; Yee,Jennifer C.29; Shvartzvald,Yossi28; Zang,Weicheng27; Han,Cheongho26; Albrow,Michael D.25; Chung,Sun-Ju24,34 |
| 刊名 | The Astronomical Journal
 |
| 出版日期 | 2019-06-21 |
| 卷号 | 158期号:1 |
| ISSN号 | 0004-6256 |
| 关键词 | gravitational lensing: micro planetary systems |
| DOI | 10.3847/1538-3881/ab237f |
| 英文摘要 | Abstract We report the discovery of a Spitzer microlensing planet OGLE-2018-BLG-0596Lb, with preferred planet-host mass ratio q?～?2?×?10?4. The planetary signal, which is characterized by a short (～1 day) “bump” on the rising side of the lensing light curve, was densely covered by ground-based surveys. We find that the signal can be explained by a bright source that fully envelops the planetary caustic, i.e., a “Hollywood” geometry. Combined with the source proper motion measured from Gaia, the Spitzer satellite parallax measurement makes it possible to precisely constrain the lens physical parameters. The preferred solution, in which the planet perturbs the minor image due to lensing by the host, yields a Uranus-mass planet with a mass of Mp?=?13.9?±?1.6?M⊕ orbiting a mid M-dwarf with a mass of Mh?=?0.23?±?0.03?M⊙. There is also a second possible solution that is substantially disfavored but cannot be ruled out, for which the planet perturbs the major image. The latter solution yields Mp?=?1.2?±?0.2?M⊕ and Mh?=?0.15?±?0.02?M⊙. By combining the microlensing and Gaia data together with a Galactic model, we find in either case that the lens lies on the near side of the Galactic bulge at a distance DL?～?6?±?1 kpc. Future adaptive optics observations may decisively resolve the major image/minor image degeneracy. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-6256-158-1-AB237F |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/28908]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Road, Chaoyang District, Beijing 100012, People’s Republic of China 2.Université de Toulouse, UPS-OMP, IRAP, Toulouse, France 3.CFHT Corporation, 65-1238 Mamalahoa Highway, Kamuela, HI 96743, USA 4.Vanderbilt University, Department of Physics & Astronomy, PMB 401807, 2301 Vanderbilt Place, Nashville, TN 37235, USA 5.Department of Physics, Faculty of Science, Kyoto Sangyo University, Kyoto 603-8555, Japan 6.University of Canterbury Mt. John Observatory, P.O. Box 56, Lake Tekapo 8770, New Zealand 7.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa 252-5210, Japan 8.School of Chemical and Physical Science, Victoria University, Wellington, New Zealand 9.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 10.Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan |
| 推荐引用方式 GB/T 7714 | Jung,Youn Kil,Gould,Andrew,Udalski,Andrzej,et al. Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf[J]. The Astronomical Journal,2019,158(1). |
| APA | Jung,Youn Kil.,Gould,Andrew.,Udalski,Andrzej.,Sumi,Takahiro.,Yee,Jennifer C..,...&Wang,Tianshu.(2019).Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf.The Astronomical Journal,158(1). |
| MLA | Jung,Youn Kil,et al."Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf".The Astronomical Journal 158.1(2019). |
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来源：国家天文台
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