文章基本信息

标题：A Gas Giant Planet in the OGLE-2006-BLG-284L Stellar Binary System
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作者：David P.Bennett ; Andrzej Udalski ; Ian A.Bond 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：2
页码：1-9
DOI：10.3847/1538-3881/ab9cb9
语种：English
出版社：American Institute of Physics
摘要：We present the analysis of microlensing event OGLE-2006-BLG-284, which has a lens system that consists of two stars and a gas giant planet with a mass ratio of qp = (1.26 ± 0.19) × 10−3 to the primary. The mass ratio of the two stars is qs = 0.289 ± 0.011, and their projected separation is ss = 2.1 ± 0.7 au, while the projected separation of the planet from the primary is sp = 2.2 ± 0.8 au. For this lens system to have stable orbits, the threedimensional separation of either the primary and secondary stars or the planet and primary star must be much larger than the projected separations. Since we do not know which is the case, the system could include either a circumbinary or a circumstellar planet. Because there is no measurement of the microlensing parallax effect or lens system brightness, we can only make a rough Bayesian estimate of the lens system masses and brightness. We find host star and planet masses of = - M M + L1 0.35 0.20 0.30 , = - M M + L2 0.10 0.06 0.09 , and = - + m M p 144 82 Å 126 , and the K-band magnitude of the combined brightness of the host stars is = - + KL 19.7 1.0 0.7. The separation between the lens and source system will be ∼90 mas in mid-2020, so it should be possible to detect the host system with follow-up adaptive optics or Hubble Space Telescope observations.