A Wide-orbit Exoplanet OGLE-2012-BLG-0838Lb,The Astronomical Journal

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A Wide-orbit Exoplanet OGLE-2012-BLG-0838Lb
The Astronomical Journal ( IF 5.3 ) Pub Date : 2020-05-14 , DOI: 10.3847/1538-3881/ab8a49
R. Poleski _{1,

2} , Daisuke Suzuki ₃ , A. Udalski ₂ , Xiaojia Xie ₄ , J. C. Yee ₅ , Naoki Koshimoto _{6,

7,

8} , B. S. Gaudi ₁ , A. Gould _{1,

9,

10} , J. Skowron ₂ , M. K. Szymański ₂ , I. Soszyński ₂ , P. Pietrukowicz ₂ , S. Kozłowski ₂ , Ł. Wyrzykowski ₂ , K. Ulaczyk _{2,

11} , Fumio Abe ₁₂ , Richard K. Barry ₈ , David. P. Bennett _{8,

13} , Aparna Bhattacharya _{8,

13} , Ian A. Bond ₁₄ , Martin Donachie ₁₅ , Hirosane Fujii ₁₂ , Akihiko Fukui _{16,

17} , Yoshitaka Itow ₁₂ , Yuki Hirao _{8,

18} , Yuhei Kamei ₁₂ , Iona Kondo ₁₈ , Man Cheung Alex Li ₁₅ , Yutaka Matsubara ₁₂ , Shota Miyazaki ₁₈ , Yasushi Muraki ₁₂ , Masayuki Nagakane ₁₈ , Clment Ranc ₈ , Nicholas J. Rattenbury ₁₅ , Yuki K. Satoh ₁₈ , Hikaru Shoji ₁₈ , Haruno Suematsu ₁₈ , Denis J. Sullivan ₁₉ , Takahiro Sumi ₁₈ , Paul J. Tristram ₂₀ , Takeharu Yamakawa ₁₂ , Tsubasa Yamawaki ₁₈ , Atsunori Yonehara ₂₁ , C. Han ₂₂ , Subo Dong ₄ , K. M. Morzinski ₂₃ , J. R. Males ₂₃ , L. M. Close ₂₃ , R. W. Pogge ₁ , J.-P. Beaulieu _{24,

25} , J.-B. Marquette _{25,

26}

Affiliation

Department of Astronomy, Ohio State University, 140 W. 18th Avenue, Columbus, OH 43210, USA
Astronomical Observatory, University of Warsaw, Al. Ujazdowskie 4, 00-478 Warszawa, Poland
Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, 3-1-1 Yoshinodai, Chuo, Sagamihara, Kanagawa 252-5210, Japan
Kavli Institute for Astronomy and Astrophysics, Peking University, Yi He Yuan Road 5, Hai Dian District, Beijing 100871, People's Republic of China
Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA 02138, USA
Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan
Astrophysics Science Division, NASA Goddard Space Flight Center, Greenbelt, MD 20771, USA
Max-Planck-Institute for Astronomy, Kigstuhl 17, D-69117 Heidelberg, Germany
Korea Astronomy and Space Science Institute, 776 Daedukdae-ro, Yuseong-gu, Daejeon 34055, Republic of Korea
Department of Physics, University of Warwick, Coventry CV4 7AL, UK
Institute for Space-Earth Environmental Research, Nagoya University, Furo-cho, Chikusa, Nagoya, Aichi 464-8601, Japan
Department of Astronomy, University of Maryland, College Park, MD 20742, USA
Institute of Information and Mathematical Sciences, Massey university, Private Bag 102-904, North Shore Mail Centre, Auckland, New Zealand
Department of Physics, University of Auckland, Private Bag 92019, Auckland, New Zealand
Department of Earth and Planetary Science, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
Instituto de Astrofsica de Canarias, Va Lctea s/n, E-38205 La Laguna, Tenerife, Spain
Department of Earth and Space Science, Graduate School of Science, Osaka University, 1-1 Machikaneyama, Toyonaka, Osaka 560-0043, Japan
School of Chemical and Physical Sciences, Victoria University, Wellington, New Zealand
University of Canterbury Mt. John Observatory, P.O. Box 56, Lake Tekapo 8770, New Zealand
Department of Physics, Faculty of Science, Kyoto Sangyo University, Kyoto 603-8555, Japan
Department of Physics, Chungbuk National University, Cheongju 28644, Republic of Korea
Steward Observatory, University of Arizona, Tucson, AZ 85721, USA
School of Natural Sciences, University of Tasmania, Private Bag 37 Hobart, Tasmania 7001 Australia
Sorbonne Universit, UPMC Universit Paris 6 et CNRS, UMR 7095, Institut d’Astrophysique de Paris, 98 bis Bd Arago, F-75014 Paris, France
Laboratoire d’Astrophysique de Bordeaux, Univ. Bordeaux, CNRS, B18N, alle Geoffroy Saint-Hilaire, F-33615 Pessac, France

We present the discovery of a planet on a very wide orbit in the microlensing event OGLE-2012-BLG-0838. The signal of the planet is well separated from the main peak of the event and the planet-star projected separation is found to be twice larger than the Einstein ring radius, which roughly corresponds to a projected separation of ~4 AU. Similar planets around low-mass stars are very hard to find using any technique other than microlensing. We discuss microlensing model fitting in detail and discuss the prospects for measuring the mass and distance of lens system directly.

中文翻译：

一颗宽轨道系外行星 OGLE-2012-BLG-0838Lb

我们在微透镜事件 OGLE-2012-BLG-0838 中展示了在非常宽的轨道上发现的行星。行星的信号与事件的主峰分离得很好，发现行星-恒星的预计间距比爱因斯坦环半径大两倍，这大致对应于约 4 AU 的预计间距。使用微透镜以外的任何技术都很难找到围绕低质量恒星的类似行星。我们详细讨论了微透镜模型拟合，并讨论了直接测量透镜系统质量和距离的前景。

更新日期：2020-05-14

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