OGLE-2015-BLG-1771Lb: A Microlens Planet Orbiting an Ultracool Dwarf?
Zhang,Xiangyu1; Zang,Weicheng1; Udalski,Andrzej2; Gould,Andrew3,4; Ryu,Yoon-Hyun5; Wang,Tianshu1,6; Yang,Hongjing1; Mao,Shude1,7; Mróz,Przemek8; Skowron,Jan2; Poleski,Radoslaw2,4; Szymański,Micha? K.2; Soszyński,Igor2; Pietrukowicz,Pawe?2; Koz?owski,Szymon2; Ulaczyk,Krzysztof9; Albrow,Michael D.10; Chung,Sun-Ju5,11; Han,Cheongho12; Hwang,Kyu-Ha5; Jung,Youn Kil5,13; Shin,In-Gu5; Shvartzvald,Yossi14; Yee,Jennifer C.13; Zhu,Wei15; Cha,Sang-Mok5,16; Kim,Dong-Jin5; Kim,Hyoun-Woo5,17; Kim,Seung-Lee5,11; Lee,Chung-Uk5,18; Lee,Dong-Joo5; Lee,Yongseok5,16; Park,Byeong-Gon5,11; Pogge,Richard W.4
Source PublicationThe Astronomical Journal
AbstractAbstract We report the discovery and the analysis of the short ( days) planetary microlensing event, OGLE-2015-BLG-1771. The event was discovered by the Optical Gravitational Lensing Experiment, and the planetary anomaly (at I?~?19) was captured by The Korea Microlensing Telescope Network. The event has three surviving planetary models that explain the observed light curves, with planet-host mass ratio q?~?5.4?×?10?3, 4.5?×?10?3 and 4.5?×?10?2, respectively. The first model is the best-fit model, while the second model is disfavored by Δχ2?~?3. The last model is strongly disfavored by Δχ2?~?15 but not ruled out. A Bayesian analysis using a Galactic model indicates that the first two models are probably composed of a Saturn-mass planet orbiting a late M dwarf, while the third one could consist of a super-Jovian planet and a mid-mass brown dwarf. The source-lens relative proper motion is μrel?~?9 mas yr?1, so the source and lens could be resolved by current adaptive-optics instruments in 2020 if the lens is luminous.
KeywordGravitational microlensing exoplanet detection
WOS IDIOP:0004-6256-159-3-ab6f6d
PublisherThe American Astronomical Society
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Document Type期刊论文
Affiliation1.Department of Astronomy and Tsinghua Centre for Astrophysics, Tsinghua University, Beijing 100084, People's Republic of China
2.Warsaw University Observatory, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
3.Max-Planck-Institute for Astronomy, K?nigstuhl 17, D-69117 Heidelberg, Germany
4.Department of Astronomy,Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210, USA
5.Korea Astronomy and Space Science Institute, Daejon 34055, Republic of Korea
6.Department of Astrophysical Sciences, Princeton University, USA
7.National Astronomical Observatories, Chinese Academy of Sciences, Beijing 100101, People's Republic of China
8.Division of Physics, Mathematics, and Astronomy, California Institute of Technology, Pasadena, CA 91125, USA
9.Department of Physics, University of Warwick, Gibbet Hill Road, Coventry, CV4 7AL, UK
10.University of Canterbury, Department of Physics and Astronomy, Private Bag 4800, Christchurch 8020, New Zealand
11.Korea University of Science and Technology, 217 Gajeong-ro, Yuseong-gu, Daejeon 34113, Republic of Korea
12.Department of Physics, Chungbuk National University, Cheongju 28644, Republic of Korea
13.Center for Astrophysics, Harvard & Smithsonian, 60 Garden Street, Cambridge, MA 02138, USA
14.Department of Particle Physics and Astrophysics, Weizmann Institute of Science, Rehovot 76100, Israel
15.Canadian Institute for Theoretical Astrophysics, University of Toronto, 60 St. George Street, Toronto, ON M5S 3H8, Canada
16.School of Space Research, Kyung Hee University, Yongin, Kyeonggi 17104, Republic of Korea
17.Department of Astronomy and Space Science, Chungbuk National University, Cheongju 28644, Republic of Korea
18.University of Science and Technology, Korea, (UST), 217 Gajeong-ro Yuseong-gu, Daejeon 34113, Republic of Korea
Recommended Citation
GB/T 7714
Zhang,Xiangyu,Zang,Weicheng,Udalski,Andrzej,et al. OGLE-2015-BLG-1771Lb: A Microlens Planet Orbiting an Ultracool Dwarf?[J]. The Astronomical Journal,2020,159(3).
APA Zhang,Xiangyu.,Zang,Weicheng.,Udalski,Andrzej.,Gould,Andrew.,Ryu,Yoon-Hyun.,...&Pogge,Richard W..(2020).OGLE-2015-BLG-1771Lb: A Microlens Planet Orbiting an Ultracool Dwarf?.The Astronomical Journal,159(3).
MLA Zhang,Xiangyu,et al."OGLE-2015-BLG-1771Lb: A Microlens Planet Orbiting an Ultracool Dwarf?".The Astronomical Journal 159.3(2020).
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