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  • 标题:OGLE-2015-BLG-1771Lb: A Microlens Planet Orbiting an Ultracool Dwarf?
  • 本地全文:下载
  • 作者:Xiangyu Zhang ; Weicheng Zang ; Andrzej Udalski
  • 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:3
  • 页码:1571-1580
  • DOI:10.3847/1538-3881/ab6f6d
  • 语种:English
  • 出版社:American Institute of Physics
  • 摘要:We report the discovery and the analysis of the short (${t}_{{\rm{E}}}\lt 5$ days) planetary microlensing event, OGLE-2015-BLG-1771.The event was discovered by the Optical Gravitational Lensing Experiment, and the planetary anomaly (at I ~ 19) was captured by The Korea Microlensing Telescope Network.The event has three surviving planetary models that explain the observed light curves, with planet-host mass ratio q ~ 5.4 × 10−3, 4.5 × 10−3 and 4.5 × 10−2, respectively.The first model is the best-fit model, while the second model is disfavored by Δχ2 ~ 3.The last model is strongly disfavored by Δχ2 ~ 15 but not ruled out.A Bayesian analysis using a Galactic model indicates that the first two models are probably composed of a Saturn-mass planet orbiting a late M dwarf, while the third one could consist of a super-Jovian planet and a mid-mass brown dwarf.The source-lens relative proper motion is μrel ~ 9 mas yr−1, so the source and lens could be resolved by current adaptive-optics instruments in 2020 if the lens is luminous.
  • 关键词:Gravitational;microlensing;exoplanet;detection
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