文章基本信息

标题：OGLE-2018-BLG-1700L: Microlensing Planet in Binary Stellar System
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作者：Cheongho Han ; Chung-Uk Lee ; 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：159
期号：2
页码：688-697
DOI：10.3847/1538-3881/ab5db9
语种：English
出版社：American Institute of Physics
摘要：We report a planet in a binary that was discovered from the analysis of the microlensing event OGLE-2018-BLG-1700.We identify the triple nature of the lens from the fact that the anomaly pattern can be decomposed into two parts produced by two binary-lens events, in which one binary pair has a mass ratio of ~0.01 between the lens components and the other pair has a mass ratio of ~0.3.We find two sets of degenerate solutions, in which one solution has a projected separation between the primary and its stellar companion less than the angular Einstein radius ${\theta }_{{\rm{E}}}$ (close solution), while the other solution has a separation greater than ${\theta }_{{\rm{E}}}$ (wide solution).From the Bayesian analysis with the constraints of the event timescale and angular Einstein radius, we find that the planet has a mass of ${4.4}_{-2.0}^{+3.0}\,{M}_{{\rm{J}}}$ and the stellar binary components have masses of ${0.42}_{-0.19}^{+0.29}\,{M}_{\odot }$ and ${0.12}_{-0.05}^{+0.08}\,{M}_{\odot }$, respectively, and the distance to the lens is ${D}_{{\rm{L}}}={7.6}_{-0.9}^{+1.2}\,\mathrm{kpc}$.The planet is a circumstellar planet according to the wide solution, while it is a circumbinary planet according to the close solution.
关键词：Exoplanet systems;Binary stars