文章基本信息

标题：OGLE-2018-BLG-1269Lb: A Jovian Planet with a Bright I = 16 Host
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作者：Youn Kil Jung ; Andrew Gould ; Andrzej Udalski 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2020
卷号：160
期号：3
页码：1-18
DOI：10.3847/1538-3881/abacc8
语种：English
出版社：American Institute of Physics
摘要：We report the discovery of a planet in the microlensing event OGLE-2018-BLG-1269 with a planet-host mass ratio 9 6 X 10 i.e.， 0.6 times maller than the Jupiter/Sun mass ratio. Combined with the Gaia parallax and proper motion, a strong one-dimensional constraint on the microlens parallax vector allows us to significantly reduce the uncertainties of lens physical parameters. A Bayesian analysis that ignores any information about light from the host elds that the lanet is a cold ant（M=0.6=M）orbit a Sulik a（ 3M）at aisan of DL=2. 56 kpe. The projected planet host separation is d =4. 611. au. Using Gaia astrometry, we show that the blended light lies 12 mas from the host and therefore must be either the host star or a stellar companion to the host. An isochrone analysis favors the former possibility at >99.6%. The host is therefore a subgiant. For host metallicities in the range of 0.0 【 Fe/H】<+0.3， the host and planet masses are then in the range of 1.16≤M/M。≤1.38and0.74≤M2/M」≤0.89， respectively. Low host metallicities are excluded. The brightness and proximity of the lens make the event a strong candidate for spectroscopic follow-up both to test the microlensing solution and to further characterize the system.