论文标题
在2016--2018季节检测到的微透镜二进制文件中的棕色矮人伴侣
Brown-dwarf companions in microlensing binaries detected during the 2016--2018 seasons
论文作者
论文摘要
为了找到含有棕色谷歌（BD）伴侣的微透镜二进制文件，我们研究了2016---2018季节收集的微透镜调查数据。为此，我们首先对具有光曲线的镜头事件进行了建模，这些镜头曲线表现出异常特征，这些特征可能是由二进制镜头产生的。然后，我们通过应用以下标准来整理BD-Companion二进制镜头事件，即同伴与主要质量比为$ Q \ sillesim 0.1 $。 From this procedure, we identify 6 binaries with candidate BD companions, including OGLE-2016-BLG-0890L, MOA-2017-BLG-477L, OGLE-2017-BLG-0614L, KMT-2018-BLG-0357L, OGLE-2018-BLG-1489L, and OGLE-2018-BLG-0360L.我们通过使用单个镜头事件的观察力进行贝叶斯分析来估计二元同伴的质量。根据贝叶斯对晶状体质量的估计，事件的镜头伴侣OGLE-2016-BLG-0890，OGLE-2017-BLG-0614，OGLE-2018-BLG-1489和OGLE-2018-BLG-2018-BLG-0360在BD质量质量方面非常高于$ p-p-p-p-p-p _ {对于MOA-2017-BLG-477和KMT-2018-BLG-0357，概率分别为$ p _ {\ rm bd} = 61 \％$和69 \％。
With the aim of finding microlensing binaries containing brown-dwarf (BD) companions, we investigate the microlensing survey data collected during the 2016--2018 seasons. For this purpose, we first conducted modeling of lensing events with light curves exhibiting anomaly features that are likely to be produced by binary lenses. We then sorted out BD-companion binary-lens events by applying the criterion that the companion-to-primary mass ratio is $q \lesssim 0.1$. From this procedure, we identify 6 binaries with candidate BD companions, including OGLE-2016-BLG-0890L, MOA-2017-BLG-477L, OGLE-2017-BLG-0614L, KMT-2018-BLG-0357L, OGLE-2018-BLG-1489L, and OGLE-2018-BLG-0360L. We estimate the masses of the binary companions by conducting Bayesian analyses using the observables of the individual lensing events. According to the Bayesian estimation of the lens masses, the probabilities for the lens companions of the events OGLE-2016-BLG-0890, OGLE-2017-BLG-0614, OGLE-2018-BLG-1489, and OGLE-2018-BLG-0360 to be in the BD mass regime are very high with $P_{\rm BD}> 80\%$. For MOA-2017-BLG-477 and KMT-2018-BLG-0357, the probabilities are relatively low with $P_{\rm BD}=61\%$ and 69\%, respectively.
