OGLE-2018-BLG-0532Lb: Cold Neptune with Possible Jovian Sibling
文献类型：期刊论文
| 作者 | Ryu,Yoon-Hyun9; Udalski,Andrzej10; Yee,Jennifer C.11; Penny,Matthew T.12; Zang,Weicheng13; Albrow,Michael D.14; Chung,Sun-Ju9,15; Gould,Andrew12,16; Han,Cheongho17; Hwang,Kyu-Ha9 |
| 刊名 | The Astronomical Journal
 |
| 出版日期 | 2020-09-25 |
| 卷号 | 160期号:4 |
| ISSN号 | 0004-6256 |
| 关键词 | Gravitational microlensing |
| DOI | 10.3847/1538-3881/abaa3f |
| 英文摘要 | Abstract We report the discovery of the planet OGLE-2018-BLG-0532Lb, with very obvious signatures in the light curve that lead to an estimate of the planet-host mass ratio . Although there are no obvious systematic residuals to this double-lens/single-source (2L1S) fit, we find that χ 2 can be significantly improved by adding either a third lens (3L1S, Δχ 2?=?81) or second source (2L2S, Δχ 2?=?77) to the lens-source geometry. After thorough investigation, we conclude that we cannot decisively distinguish between these two scenarios and therefore focus on the robustly detected planet. However, given the possible presence of a second planet, we investigate to what degree and with what probability such additional planets may affect seemingly single-planet light curves. Our best estimates for the properties of the lens star and the secure planet are a host mass M?～?0.25 M ⊙, system distance D L ?～?1 kpc,?and planet mass with projected separation . However, there is a relatively bright I?=?18.6 (and also relatively blue) star projected within of the lens, and if future high-resolution images show that this is coincident with the lens, then it is possible that it is the lens, in which case, the lens would be both more massive and more distant than the best-estimated values above. |
| 语种 | 英语 |
| 出版者 | The American Astronomical Society |
| WOS记录号 | IOP:0004-6256-160-4-ABAA3F |
| 源URL | [http://ir.bao.ac.cn/handle/114a11/57517]  |
| 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 Rd., Chaoyang District, Beijing 100012, People's Republic of China 2.Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St George St., Toronto, ON M5S 3H8, Canada 3.Université de Toulouse, UPS-OMP, IRAP, Toulouse, France 4.IPAC, Mail Code 100-22, Caltech, 1200 E. California Blvd., Pasadena, CA 91125, USA 5.School of Space Research, Kyung Hee University, Yongin, Kyeonggi 17104, Republic of Korea 6.Department of Astronomy and Space Science, Chungbuk National University, Cheongju 28644, Republic of Korea 7.Department of Physics, University of Warwick, Gibbet Hill Rd., Coventry, CV4?7AL,?UK 8.CFHT Corporation, 65-1238 Mamalahoa Hwy., Kamuela, HI 96743, USA 9.Korea Astronomy and Space Science Institute, Daejon 34055, Republic of Korea 10.Warsaw University Observatory, Al.?Ujazdowskie?4, 00-478?Warszawa, Poland |
| 推荐引用方式 GB/T 7714 | Ryu,Yoon-Hyun,Udalski,Andrzej,Yee,Jennifer C.,et al. OGLE-2018-BLG-0532Lb: Cold Neptune with Possible Jovian Sibling[J]. The Astronomical Journal,2020,160(4). |
| APA | Ryu,Yoon-Hyun.,Udalski,Andrzej.,Yee,Jennifer C..,Penny,Matthew T..,Zang,Weicheng.,...&Wang,Tianshu.(2020).OGLE-2018-BLG-0532Lb: Cold Neptune with Possible Jovian Sibling.The Astronomical Journal,160(4). |
| MLA | Ryu,Yoon-Hyun,et al."OGLE-2018-BLG-0532Lb: Cold Neptune with Possible Jovian Sibling".The Astronomical Journal 160.4(2020). |
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来源：国家天文台
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