OGLE-2015-BLG-1649Lb: A Gas Giant Planet around a Low-mass Dwarf
文献类型：期刊论文
| 作者 | Nagakane,M.2; Lee,Chien-Hsiu3; Koshimoto,N.4,5; Suzuki,D.6; Udalski,A.7; Beaulieu,J. P.8; Sumi,T.2; Bennett,D. P.9,10; Bond,I. A.11; Rattenbury,N.12 |
| 刊名 | The Astronomical Journal
 |
| 出版日期 | 2019-11-01 |
| 卷号 | 158期号:5 |
| ISSN号 | 0004-6256 |
| 关键词 | Gravitational microlensing Exoplanet astronomy |
| DOI | 10.3847/1538-3881/ab4881 |
| 英文摘要 | Abstract We report the discovery of an exoplanet from the analysis of the gravitational microlensing event OGLE-2015-BLG-1649 that challenges the core accretion model of planet formation and appears to support the disk instability model. The planet/host-star mass ratio is q?=?7.2?×?10?3 and the projected separation normalized to the angular Einstein radius is s?=?0.9. We conducted high-resolution follow-up observations using the Infrared Camera and Spectrograph (IRCS) camera on the Subaru telescope and are able to place an upper limit on the lens flux. From these measurements we are able to exclude all host stars greater than or equal in mass to a G-type dwarf. We conducted a Bayesian analysis with these new flux constraints included as priors resulting in estimates of the masses of the host star and planet. These are ML?=?0.34?±?0.19?M⊙ and , respectively. The distance to the system is . The projected star–planet separation is . The estimated relative lens-source proper motion, ～7.1?mas yr?1, is fairly high and thus the lens can be better constrained if additional follow-up observations are conducted several years after the event. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-6256-158-5-AB4881 |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/28604]  |
| 专题 | 中国科学院国家天文台 |
| 作者单位 | 1.Planetary and Space Sciences, Department of Physical Sciences, The Open University, Milton Keynes, MK7 6AA, UK 2.Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan 3.650 N Aohoku Pl. Hilo, HI 96720, USA 4.Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan 5.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 6.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan 7.Astronomical Observatory, University of Warsaw, Al.?Ujazdowskie?4,00-478?Warszawa, Poland 8.Sorbonne Universités, CNRS, UPMC Univ Paris 06, UMR 7095, Institut d’Astrophysique de Paris, F-75014, Paris, France 9.Laboratory for Exoplanets and Stellar Astrophysics, NASA/Goddard Space Flight Center, Greenbelt, MD 20771, USA 10.Department of Astronomy, University of Maryland, College Park, MD 20742, USA |
| 推荐引用方式 GB/T 7714 | Nagakane,M.,Lee,Chien-Hsiu,Koshimoto,N.,et al. OGLE-2015-BLG-1649Lb: A Gas Giant Planet around a Low-mass Dwarf[J]. The Astronomical Journal,2019,158(5). |
| APA | Nagakane,M..,Lee,Chien-Hsiu.,Koshimoto,N..,Suzuki,D..,Udalski,A..,...&Rahvar,S..(2019).OGLE-2015-BLG-1649Lb: A Gas Giant Planet around a Low-mass Dwarf.The Astronomical Journal,158(5). |
| MLA | Nagakane,M.,et al."OGLE-2015-BLG-1649Lb: A Gas Giant Planet around a Low-mass Dwarf".The Astronomical Journal 158.5(2019). |
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来源：国家天文台
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