NAOC Open IR
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
2020-09-25
Source PublicationThe Astronomical Journal
ISSN0004-6256
Volume160Issue:4
AbstractAbstract 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.
KeywordGravitational microlensing
DOI10.3847/1538-3881/abaa3f
Language英语
WOS IDIOP:0004-6256-160-4-abaa3f
PublisherThe American Astronomical Society
Citation statistics
Document Type期刊论文
Identifierhttp://ir.bao.ac.cn/handle/114a11/57518
Collection中国科学院国家天文台
Affiliation1.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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