KMS National Astronomical Observatories, CAS
| OGLE-2018-BLG-0532Lb: Cold Neptune with Possible Jovian Sibling | |
Ryu,Yoon-Hyun1; Udalski,Andrzej2; Yee,Jennifer C.3; Penny,Matthew T.4; Zang,Weicheng5; Albrow,Michael D.6; Chung,Sun-Ju1,7; Gould,Andrew4,8; Han,Cheongho9; Hwang,Kyu-Ha1; Jung,Youn Kil1; Shin,In-Gu1; Shvartzvald,Yossi10; Cha,Sang-Mok1,11; Kim,Dong-Jin1; Kim,Hyoun-Woo1,12; Kim,Seung-Lee1,7; Lee,Chung-Uk1,7; Lee,Dong-Joo1; Lee,Yongseok1,11; Park,Byeong-Gon1,7; Pogge,Richard W.4; Mróz,Przemek2; Szymański,Micha? K.2; Skowron,Jan2; Poleski,Radek4; Soszyński,Igor2; Pietrukowicz,Pawe?2; Koz?owski,Szymon2; Ulaczyk,Krzysztof13; Rybicki,Krzysztof A.2; Iwanek,Patryk2; Wrona,Marcin2; Mao,Shude5,14 ; Fouque,Pascal15,16; Zhu,Wei17; Wang,Tianshu5
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| 2020-09-25 | |
| Source Publication | The Astronomical Journal
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| ISSN | 0004-6256 |
| Volume | 160Issue:4 |
| Abstract | 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. |
| Keyword | Gravitational microlensing |
| DOI | 10.3847/1538-3881/abaa3f |
| Language | 英语 |
| WOS ID | IOP:0004-6256-160-4-abaa3f |
| Publisher | The American Astronomical Society |
| Citation statistics | |
| Document Type | 期刊论文 |
| Identifier | http://ir.bao.ac.cn/handle/114a11/57518 |
| Collection | 中国科学院国家天文台 |
| Affiliation | 1.Korea Astronomy and Space Science Institute, Daejon 34055, Republic of Korea 2.Warsaw University Observatory, Al.?Ujazdowskie?4, 00-478?Warszawa, Poland 3.Center for Astrophysics∣Harvard & Smithsonian, 60 Garden St., Cambridge, MA 02138, USA 4.Department of Astronomy, Ohio State University, 140 W. 18th Ave., Columbus, OH 43210, USA 5.Physics Department and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, People's Republic of China 6.University of Canterbury, Department of Physics and Astronomy, Private Bag 4800, Christchurch 8020, New Zealand 7.Korea University of Science and Technology, Korea, (UST), 217 Gajeong-ro, Yuseong-gu, Daejeon, 34113, Republic of Korea 8.Max-Planck-Institute for Astronomy, K?nigstuhl 17, D-69117 Heidelberg, Germany 9.Department of Physics, Chungbuk National University, Cheongju 28644, Republic of Korea 10.IPAC, Mail Code 100-22, Caltech, 1200 E. California Blvd., Pasadena, CA 91125, USA 11.School of Space Research, Kyung Hee University, Yongin, Kyeonggi 17104, Republic of Korea 12.Department of Astronomy and Space Science, Chungbuk National University, Cheongju 28644, Republic of Korea 13.Department of Physics, University of Warwick, Gibbet Hill Rd., Coventry, CV4?7AL,?UK 14.National Astronomical Observatories, Chinese Academy of Sciences, A20 Datun Rd., Chaoyang District, Beijing 100012, People's Republic of China 15.CFHT Corporation, 65-1238 Mamalahoa Hwy., Kamuela, HI 96743, USA 16.Université de Toulouse, UPS-OMP, IRAP, Toulouse, France 17.Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St George St., Toronto, ON M5S 3H8, Canada |
| Recommended Citation 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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