文章基本信息

标题：KMT-2019-BLG-0371 and the Limits of Bayesian Analysis
本地全文：下载
作者：Yun Hak Kim ; Sun-Ju Chung ; Jennifer C.Yee 等
期刊名称：The Astronomical journal
印刷版ISSN：0004-6256
电子版ISSN：1538-3881
出版年度：2021
卷号：162
期号：1
页码：1-12
DOI：10.3847/1538-3881/abf930
语种：English
出版社：American Institute of Physics
摘要：We show that the perturbation at the peak of the light curve of microlensing event KMT-2019-BLG-0371 is explained by a model with a mass ratio between the host star and planet of q ∼ 0.08. Due to the short event duration (tE ∼ 6.5 days), the secondary object in this system could potentially be a massive giant planet. A Bayesian analysis shows that the system most likely consists of a host star with a mass and a massive giant planet with a mass . However, the interpretation of the secondary as a planet (i.e., as having Mp < 13MJup) rests entirely on the Bayesian analysis. Motivated by this event, we conduct an investigation to determine which constraints meaningfully affect Bayesian analyses for microlensing events. We find that the masses inferred from such a Bayesian analysis are determined almost entirely by the measured value of θE and are relatively insensitive to other factors such as the direction of the event (ℓ, b), the lens–source relative proper motion μrel, or the specific Galactic model prior.