OGLE-2018-BLG-1011Lb,c: Microlensing Planetary System with Two Giant Planets Orbiting a Low-mass Star
OGLE-2018-BLG-1011Lb,c: Microlensing Planetary System with Two Giant Planets Orbiting a Low-mass Star
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DOI：
10.3847/1538-3881/ab2f74
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发表时间：
2019-07
期刊：
影响因子：
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通讯作者：
C. Han;D. Bennett;A. Udalski;A. Gould;I. Bond;Y. Shvartzvald;Kay-Sebastian Nikolaus;M. Hundertmark-M.-Hunde
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作者：
C. Han;D. Bennett;A. Udalski;A. Gould;I. Bond;Y. Shvartzvald;Kay-Sebastian Nikolaus;M. Hundertmark-M.-Hunde
我们报告了一个从微透镜事件OGLE-2018-BLG-1011的分析中发现的多行星系统，其光变曲线在峰值附近呈现出双凸异常。我们发现这种异常现象无法通过二元透镜或二元光源解释来完全解释，并且其描述需要引入额外的透镜组件。3L 1 S（三个透镜组件和一个单一的源）模型产生了三组解，其中一组解表明透镜是一个双星中的行星系统，而另外两组解表明透镜是一个多行星系统。通过研究各个模型与详细的光变曲线结构的拟合，我们发现行星与宿主质量比为<$9.5 × 10−3和<$15 × 10−3的多行星解优于其他解。从贝叶斯分析，我们发现，该透镜是由两个行星的质量和周围的主机质量和位于一个距离。估计的距离表明，透镜是已知的多行星系统中最远的系统。投影的行星与宿主的距离分别为（）和（），其中括号内和括号外的α，2是对应于两个简并解的距离，表明两颗行星都位于宿主雪线之外，与之前通过微透镜发现的其他四个多行星系统一样。
We report a multiplanetary system found from the analysis of microlensing event OGLE-2018-BLG-1011, for which the light curve exhibits a double-bump anomaly around the peak. We find that the anomaly cannot be fully explained by the binary-lens or binary-source interpretations and its description requires the introduction of an additional lens component. The 3L1S (three lens components and a single source) modeling yields three sets of solutions, in which one set of solutions indicates that the lens is a planetary system in a binary, while the other two sets imply that the lens is a multiplanetary system. By investigating the fits of the individual models to the detailed light curve structure, we find that the multiple-planet solution with planet-to-host mass ratios ∼9.5 × 10−3 and ∼15 × 10−3 are favored over the other solutions. From the Bayesian analysis, we find that the lens is composed of two planets with masses and around a host with a mass and located at a distance . The estimated distance indicates that the lens is the farthest system among the known multiplanetary systems. The projected planet–host separations are ( ) and , where the values of a⊥,2 inside and outside the parenthesis are the separations corresponding to the two degenerate solutions, indicating that both planets are located beyond the snow line of the host, as with the other four multiplanetary systems previously found by microlensing.