论文标题
M DWARF系外行星大气的半经验建模托管GJ 832和GJ 581
Semi-Empirical Modeling of the Atmospheres of the M Dwarf Exoplanet Hosts GJ 832 and GJ 581
论文作者
论文摘要
恒星紫外线（UV）辐射驱动光化学和极端粉状物（EUV）辐射驱动外部大气中的质量损失。但是，由于星际吸收，尤其是在EUV范围内（100--912 A），紫外线不可观察。因此，有必要重建不可观察的光谱，以表征系外行星的辐射环境。在目前的工作中，我们使用辐射传输代码SSRPM来构建两个M矮人系列宿主，GJ 832和GJ 581的一维半经验模型，并合成它们的光谱。 SSRPM配备了广泛的原子和分子数据库以及全NLTE功能。我们在可见的，紫外和X射线范围内使用观察结果来限制模型恒星的大气结构。发现合成的综合EUV通量与其他重建技术非常吻合，但是光谱能量分布（SED）在整个EUV范围内显着不同意。超过2/3的EUV通量形成了$ 10^5 $K。我们发现，远紫外线（FUV）连续体贡献了1450---1700之间的整个FUV通量的42--54％A. GJ 832和GJ 581的恒星结构的比较表明，GJ 832表明GJ 832是一个更具宏伟活性的STARETORS CORMIT STARETORS，是CORROB的STRORERER，这是另一个是Corroub，这是一个是corm的，这是一个是courobs，它是一个courpor，是一个是corm的，这是一个是cormit s的，是一个是cormit的sarter，这是一个是cormit的sarter，这是一个较高的courpor。
Stellar ultraviolet (UV) radiation drives photochemistry, and extreme-ultraviolet (EUV) radiation drives mass loss in exoplanet atmospheres. However, the UV flux is partly unobservable due to interstellar absorption, particularly in the EUV range (100--912 A). It is therefore necessary to reconstruct the unobservable spectra in order to characterize the radiation environment of exoplanets. In the present work, we use a radiative transfer code SSRPM to build one-dimensional semi-empirical models of two M dwarf exoplanet hosts, GJ 832 and GJ 581, and synthesize their spectra. SSRPM is equipped with an extensive atomic and molecular database and full-NLTE capabilities. We use observations in the visible, ultraviolet, and X-ray ranges to constrain atmospheric structures of the modeled stars. The synthesized integrated EUV fluxes are found to be in good agreement with other reconstruction techniques, but the spectral energy distributions (SEDs) disagree significantly across the EUV range. More than 2/3 of the EUV flux is formed above $10^5$ K. We find that the far ultraviolet (FUV) continuum contributes 42--54 % of the entire FUV flux between 1450--1700 A. The comparison of stellar structures of GJ 832 and GJ 581 suggests that GJ 832 is a more magnetically active star, which is corroborated by other activity indicators.
