Systematic Korea Microlensing Telescope Network planetary anomaly search – III. One wide-orbit planet and two stellar binaries
Systematic Korea Microlensing Telescope Network planetary anomaly search – III. One wide-orbit planet and two stellar binaries
复制标题
系统化的韩国微透镜望远镜网络行星异常搜索 Ⅲ．
DOI：
10.1093/mnras/stab3581
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发表时间：
2021
影响因子：
4.8
通讯作者：
Jung, Youn Kil
中科院分区：
文献类型：
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作者：
Hwang, Kyu-Ha;Udalski, Andrzej;Gould, Andrew;Han, Cheongho;Albrow, Michael D;Chung, Sun-Ju;Jung, Youn Kil
只有少数围绕古老恒星的宽轨道行星被发现，这限制了我们对这颗行星人口的统计理解。继韩国微透镜望远镜网络发现的微透镜事件中的行星异常的系统搜索之后，我们提出了三个最初被认为包含宽轨道行星的事件的发现和分析。OGLE-2018-BLG-0383光变曲线的异常特征是由一颗质量比q = 2.1 × 10− 4和投影分离= 2.45的行星引起的。这使它成为在如此宽的轨道上质量比最低的微透镜行星。另外两个事件，KMT-2018-BLG-0998和OGLE-2018-BLG-0271，被证明是恒星双星（q> 0.1），具有相当接近（s< 1）的分离。我们简要地讨论了已知的宽轨道微透镜行星的性质，并表明，调查观察是至关重要的发现和进一步统计约束这样的行星人口。
Only a few wide-orbit planets around old stars have been detected, which limits our statistical understanding of this planet population. Following the systematic search for planetary anomalies in microlensing events found by the Korea Microlensing Telescope Network, we present the discovery and analysis of three events that were initially thought to contain wide-orbit planets. The anomalous feature in the light curve of OGLE-2018-BLG-0383 is caused by a planet with mass ratioq= 2.1 × 10−4and a projected separations= 2.45. This makes it the lowest mass-ratio microlensing planet at such wide orbits. The other two events, KMT-2018-BLG-0998 and OGLE-2018-BLG-0271, are shown to be stellar binaries (q> 0.1) with rather close (s< 1) separations. We briefly discuss the properties of known wide-orbit microlensing planets and show that the survey observations are crucial in discovering and further statistically constraining such a planet population.