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Bayesian Approach for Determining Microlens System Properties with High-angular-resolution Follow-up Imaging
The Astronomical Journal ( IF 5.3 ) Pub Date : 2020-05-21 , DOI: 10.3847/1538-3881/ab8adf
Naoki Koshimoto 1, 2, 3 , David P. Bennett 2, 3 , Daisuke Suzuki 4
Affiliation  

We present the details of the Bayesian analysis on the planetary microlensing event MOA-2016-BLG-227, whose excess flux is likely due to a source/lens companion or an unrelated ambient star, as well as of the assumed prior distributions. Furthermore, we apply this method to four reported planetary events, MOA-2008-BLG-310, MOA-2011-BLG-293, OGLE-2012-BLG-0527, and OGLE-2012-BLG-0950, where adaptive optics observations have detected excess flux at the source star positions. For events with small angular Einstein radii, our lens mass estimates are more uncertain than those of previous analyses who assumed that the excess was due to the lens. Our predictions for MOA-2008-BLG-310 and OGLE-2012-BLG-0950 are consistent with recent results on these events obtained via Keck and Hubble Space Telescope observations when the source star is resolvable from the lens star. For events with small angular Einstein radii, we find that it is generally difficult to conclude whether the excess flux comes from the host star. Therefore, it is necessary to identify the lens star by measuring its proper motion relative to the source star to determine whether the excess flux comes from the lens star. Even without such measurements, our method can be used to statistically test the dependence of the planet-hosting probability on the stellar mass.

中文翻译:

用于确定具有高角分辨率后续成像的微透镜系统特性的贝叶斯方法

我们提供了对行星微透镜事件 MOA-2016-BLG-227 的贝叶斯分析的详细信息,其过量通量可能是由于源/透镜伴星或不相关的环境恒星,以及假设的先验分布。此外,我们将此方法应用于四个报告的行星事件,MOA-2008-BLG-310、MOA-2011-BLG-293、OGLE-2012-BLG-0527 和 OGLE-2012-BLG-0950,其中自适应光学观测具有在源星位置检测到过量通量。对于爱因斯坦角半径较小的事件,我们的透镜质量估计比之前假设过量是由于透镜造成的分析更加不确定。我们对 MOA-2008-BLG-310 和 OGLE-2012-BLG-0950 的预测与最近通过凯克和哈勃太空望远镜观测获得的这些事件的结果一致,当源星可以从透镜星分辨出来时。对于小爱因斯坦角半径的事件,我们发现通常很难断定多余的通量是否来自主星。因此,有必要通过测量透镜星相对于源星的自身运动来识别透镜星,以确定多余的通量是否来自透镜星。即使没有这样的测量,我们的方法也可以用于统计测试行星宿主概率对恒星质量的依赖性。因此,有必要通过测量透镜星相对于源星的自身运动来识别透镜星,以确定多余的通量是否来自透镜星。即使没有这样的测量,我们的方法也可以用于统计测试行星宿主概率对恒星质量的依赖性。因此,有必要通过测量透镜星相对于源星的自身运动来识别透镜星,以确定多余的通量是否来自透镜星。即使没有这样的测量,我们的方法也可以用于统计测试行星宿主概率对恒星质量的依赖性。
更新日期:2020-05-21
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