类水星系外行星偏振特性研究  

The Polarization Characteristics of Mercury-like Exoplanets

作　　者：孙杰[1,2] 屈中权[1] 闫晓理[1] 

机构地区：[1]中国科学院云南天文台,昆明650011 [2]中国科学院研究生院,北京100049

出　　处：《天文学报》2012年第6期507-518,共12页Acta Astronomica Sinica

基　　金：国家自然科学基金项目(10903027;1 1078005;10943002)资助

摘　　要：通过对不可分辨水星偏振相位曲线的研究了解类水星不可分辨系外行星的偏振特性,为用偏振探测手段寻找类水星系外行星提供有力的依据.通过贝叶斯非线性拟合得到水星测光相位曲线和偏振相位曲线,进而得到不可分辨水星的偏振相位曲线.从该曲线中得出以下结果:(1)水星在不可分辨情况下在可见光波段其偏振度的量级为10^(-12);(2)垂直于散射平面和平行于散射平面的最大偏振度相当,且它们所对应的相位角相对于可分辨情况下发生了明显的改变;(3)在相位角大于158°时不可分辨水星的偏振度几乎为零.This paper aims at studying the polarization characteristics of Mercury- like exoplanets via the polarization phase curve of the unresolved Mercury. We utilize the Bayesian non-linear fitting method to get the photometric phase curve and the polariza- tion phase curve of Mercury. From these two kinds of curves, we obtain the polarization phase curve of the unresolved Mercury. The results from the unresolved polarization phase curve are as follows： first, in the visible light band the magnitude order of the polariza- tion degree is 10-12; second, its maximum value in the case parallel to the scattering plane is comparable to that in the case vertical to the scattering plane, and their correspond- ing phase angles are changed evidently in comparison with the resolved Mercury case; third, the polarization amplitudes decrease to zero when the phase angle becomes larger than 158°.

关 键 词：行星与卫星 个别 水星 方法 数据分析 

分 类 号：P185[天文地球—天文学]