焦散线交叉双星微透镜事件中的偏振
Polarization in caustic-crossing binary microlensing events
摘要：
在这里，我们重新审视焦散交叉二元微透镜的偏振信号，并介绍源星的偏振信号的映射作为其在透镜平面上投影的位置的函数。这些贴图的行为取决于与焦散相比的源大小。如果源的尺寸小于焦散曲线，则最大极化信号出现在源边缘穿过距主源位置最近的褶皱时。当源的尺寸大于焦散线时，极化信号在主源周围的圆环上最大，其半径归一化为源半径约0.96。在尖点焦散渡中，极化曲线有三个峰值，最大最宽的峰值出现在源边缘位于尖点的拐角处，而源中心位于焦散曲线的内侧。当源完全在焦散线内时，偏振信号显著减小。尽管行星焦散线的两个部分之间的放大系数很低，但它的偏振信号是相当可观的，对于早型星可以达到0.2%。当极化曲线穿过焦散线时，极化曲线有三个闭合的峰值，中间的峰值出现在焦散线上。
英文摘要：
Here, we revisit the polarization signal in caustic-crossing binary microlensing and introduce the maps of the polarization signals of the source star as a function of its position projected on the lens plane. The behavior of these maps depends on the source size in comparison with the caustic. If the source size is so smaller than the caustic curve, the maximum polarization signal occurs while the source edge is crossing the nearest folds to the position of the primary. When the source size is larger than the caustic, the polarization signal maximizes over a circular ring around the primary whose radius normalized to the source radius is ~0.96. In cusp caustic crossings, the polarization curves have three peaks, the largest and widest one happens when the source edge is on the corner of the cusp and the source center is inside the caustic curve. When the source is entirely inside the caustic, the polarization signal significantly decreases. Despite the low magnification factor between two parts of planetary caustics, its polarization signal is considerable and can reach to 0.2\% for early-type stars. While crossing the connection line between different parts of caustic, the polarimetry curve have three close peaks that the middle one appears when the source center is upon the connection line.
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