OGLE-2018-BLG-0677Lb: A Super-Earth Near the Galactic Bulge
OGLE-2018-BLG-0677Lb: A Super-Earth Near the Galactic Bulge
复制标题
OGLE-2018-BLG-0677Lb：银河系核球附近的超级地球
DOI：
10.3847/1538-3881/ab893e
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发表时间：
2020
期刊：
影响因子：
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通讯作者：
M. Wrona
中科院分区：
文献类型：
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作者：
Antonio Herrera;M. Albrow;A. Udalski;A. Gould;A. Gould;A. Gould;Y. Ryu;J. Yee;S. Chung;S. Chung;C. Han;K. Hwang;Y. Jung;C.‐U. Lee;C.‐U. Lee;I. Shin;Y. Shvartzvald;W. Zang;S. Cha;S. Cha;Dong;Hong;Shinyoung Kim;Shinyoung Kim;D. J. Lee;D. J. Lee;Yongseok Lee;Yongseok Lee;B.;B.;R. Pogge;M. Szymański;P. Mróz;J. Skowron;R. Poleski;R. Poleski;I. Soszyński;S. Kozłowski;P. Pietrukowicz;K. Ulaczyk;K. Rybicki;P. Iwanek;M. Wrona
我们报告了微透镜事件 OGLE-2018-BLG-0677 的分析。事件光变曲线中的一个小特征导致人们发现透镜是一个恒星-行星系统。尽管对于该事件存在无法区分的两种简并解，但两者都会导致相似的行星-宿主质量比。我们基于银河模型进行贝叶斯分析，以获得系统的属性，发现该行星对应于质量为 的超级地球/亚海王星。主星的质量为 .内部和外部解决方案的预计分离分别为 au 和 au。在 处，这是迄今为止任何安全检测到的微透镜行星中最低的 Δχ2，这一特征与它主要通过“下降”而不是“凸起”检测的事实密切相关。
We report the analysis of the microlensing event OGLE-2018-BLG-0677. A small feature in the light curve of the event leads to the discovery that the lens is a star–planet system. Although there are two degenerate solutions that could not be distinguished for this event, both lead to a similar planet-host mass ratio. We perform a Bayesian analysis based on a Galactic model to obtain the properties of the system and find that the planet corresponds to a super-Earth/sub-Neptune with a mass of . The host star has a mass of . The projected separation for the inner and outer solutions are au and au respectively. At , this is by far the lowest Δχ2 for any securely detected microlensing planet to date, a feature that is closely connected to the fact that it is detected primarily via a “dip” rather than a “bump.”