引力微透镜事件MACHO-97-BLG-41的组合观测再分析
Reanalysis of the Gravitational Microlensing Event MACHO-97-BLG-41 based on Combined Data
摘要：
BLG-41是由第一代透镜实验探测到的多个质量组成的透镜产生的引力微透镜事件。对于这一事件，基于两个不同的数据集的独立分析对透镜存在两种不同的解释：一种解释是由环双星行星系统产生的事件，而另一种解释是通过引入透镜的轨道运动来解释只有双星系统的光变曲线。根据前一种解释，透镜不仅是第一颗通过微透镜探测到的行星，也是第一颗被探测到的环双星行星。为了使用最先进的分析方法解决这个问题，我们根据先前分析单独使用的组合数据重新分析了该事件。通过考虑各种高阶效应，我们发现轨道双星透镜模型比环双星行星模型提供了更好的拟合，Δχ^2 ~166。这一结果表明，在解释事件时，透镜光变曲线的均匀和密集覆盖是重要的。
英文摘要：
MACHO-97-BLG-41 is a gravitational microlensing event produced by a lens composed of multiple masses detected by the first-generation lensing experiment. For the event, there exist two different interpretations of the lens from independent analyses based on two different data sets: one interpreted the event as produced by a circumbinary planetary system while the other explained the light curve with only a binary system by introducing orbital motion of the lens. According to the former interpretation, the lens would be not only the first planet detected via microlensing but also the first circumbinary planet ever detected. To resolve the issue using state-of-the-art analysis methods, we reanalyze the event based on the combined data used separately by the previous analyses. By considering various higher-order effects, we find that the orbiting binary-lens model provides a better fit than the circumbinary planet model with Δχ^2 ~166. The result signifies the importance of even and dense coverage of lensing light curves in the interpretation of events.
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