OGLE-2009-BLG-023/MOA-2009-BLG-028 : characterization of a binary microlensing event based on survey data
OGLE-2009-BLG-023/MOA-2009-BLG-028 : characterization of a binary microlensing event based on survey data
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OGLE-2009-BLG-023/MOA-2009-BLG-028：基于调查数据的二元微透镜事件的表征
DOI：
10.1111/j.1365-2966.2011.18206.x
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发表时间：
2011
影响因子：
4.8
通讯作者：
et al
中科院分区：
文献类型：
--
作者：
Hwang;K.-H.;et al
我们报告了焦散交叉二元透镜微透镜事件OGLE-2009-BLG-023/MOA-2009-BLG-028的光变曲线分析结果。尽管这一事件只能通过巡天实验观察到，但我们可以通过同时测量爱因斯坦半径和透镜视差来唯一地确定透镜的质量和距离。由此我们发现，该透镜系统是由质量为（0.50 ± 0.07）和（0.15 ± 0.02）M-型矮星组成的，它们位于银盘中，距银球方向约1.8 kpc。这一事件表明，物理透镜参数的二进制透镜事件可以定期确定从未来的高节奏的透镜调查，从而微透镜可以提供一种新的方法来研究银河系双星。
We report the result of the analysis of the light curve of a caustic-crossing binary-lens microlensing event OGLE-2009-BLG-023/MOA-2009-BLG-028. Even though the event was observed solely by survey experiments, we could uniquely determine the mass of the lens and distance to it by simultaneously measuring the Einstein radius and lens parallax. From this, we find that the lens system is composed of M-type dwarfs with masses (0.50 ± 0.07) and (0.15 ± 0.02) M⊙located in the Galactic disc with a distance of ∼1.8 kpc toward the Galactic bulge direction. The event demonstrates that physical lens parameters of binary-lens events can be routinely determined from future high-cadence lensing surveys and thus microlensing can provide a new way to study Galactic binaries.