Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf

doi:10.3847/1538-3881/ab237f

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	Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf
	Jung,Youn Kil 34; Gould,Andrew 32,33,34; Udalski,Andrzej 31; Sumi,Takahiro 30; Yee,Jennifer C.29; Shvartzvald,Yossi 28; Zang,Weicheng 27; Han,Cheongho 26; Albrow,Michael D.25; Chung,Sun-Ju 24,34
刊名	The Astronomical Journal
	2019-06-21
卷号	158 期号:1
关键词	gravitational lensing: micro planetary systems
ISSN号	0004-6256
DOI	10.3847/1538-3881/ab237f
英文摘要	Abstract We report the discovery of a Spitzer microlensing planet OGLE-2018-BLG-0596Lb, with preferred planet-host mass ratio q?～?2?×?10?4. The planetary signal, which is characterized by a short (～1 day) “bump” on the rising side of the lensing light curve, was densely covered by ground-based surveys. We find that the signal can be explained by a bright source that fully envelops the planetary caustic, i.e., a “Hollywood” geometry. Combined with the source proper motion measured from Gaia, the Spitzer satellite parallax measurement makes it possible to precisely constrain the lens physical parameters. The preferred solution, in which the planet perturbs the minor image due to lensing by the host, yields a Uranus-mass planet with a mass of Mp?=?13.9?±?1.6?M⊕ orbiting a mid M-dwarf with a mass of Mh?=?0.23?±?0.03?M⊙. There is also a second possible solution that is substantially disfavored but cannot be ruled out, for which the planet perturbs the major image. The latter solution yields Mp?=?1.2?±?0.2?M⊕ and Mh?=?0.15?±?0.02?M⊙. By combining the microlensing and Gaia data together with a Galactic model, we find in either case that the lens lies on the near side of the Galactic bulge at a distance DL?～?6?±?1 kpc. Future adaptive optics observations may decisively resolve the major image/minor image degeneracy.
语种	英语
出版者	The American Astronomical Society
WOS记录号	IOP:0004-6256-158-1-AB237F
内容类型	期刊论文
源URL	[http://ir.bao.ac.cn/handle/114a11/28908]
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 Road, Chaoyang District, Beijing 100012, People’s Republic of China 2.Université de Toulouse, UPS-OMP, IRAP, Toulouse, France 3.CFHT Corporation, 65-1238 Mamalahoa Highway, Kamuela, HI 96743, USA 4.Vanderbilt University, Department of Physics & Astronomy, PMB 401807, 2301 Vanderbilt Place, Nashville, TN 37235, USA 5.Department of Physics, Faculty of Science, Kyoto Sangyo University, Kyoto 603-8555, Japan 6.University of Canterbury Mt. John Observatory, P.O. Box 56, Lake Tekapo 8770, New Zealand 7.Institute of Space and Astronautical Science, Japan Aerospace Exploration Agency, Kanagawa 252-5210, Japan 8.School of Chemical and Physical Science, Victoria University, Wellington, New Zealand 9.National Astronomical Observatory of Japan, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan 10.Department of Astronomy, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan
推荐引用方式 GB/T 7714	Jung,Youn Kil,Gould,Andrew,Udalski,Andrzej,et al. Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf[J]. The Astronomical Journal,2019,158(1).
APA	Jung,Youn Kil.,Gould,Andrew.,Udalski,Andrzej.,Sumi,Takahiro.,Yee,Jennifer C..,...&Wang,Tianshu.(2019).Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf.The Astronomical Journal,158(1).
MLA	Jung,Youn Kil,et al."Spitzer Parallax of OGLE-2018-BLG-0596: A Low-mass-ratio Planet around an M Dwarf".The Astronomical Journal 158.1(2019).