Abstract

Simulation results are presented for the Lyα flux impact from the parent star on the Hα absorption spectrum in the atmospheres of the hot Jupiters HD189733b and HD 209458b. The atmosphere is simulated using a three-dimensional hydrodynamic code. Several options are considered for the upper atmospheric composition, including variations in the XUV parameter. The Lyα photon transfer in the atmosphere is simulated by the Monte Carlo method. Spatial distributions are obtained for the bulk density of hydrogen atoms excited to the second energy level; absorption spectra in the Hα line are calculated. It is shown that the transit absorption of the hot Jupiters in the Hα line can be described by a relatively simple model of the Lyα photon transfer in the upper atmosphere.

中文翻译：

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母星的Lyα通量对热木星HD189733b和HD 209458b大气中Hα吸收的影响

摘要

给出了来自热恒星木星HD189733b和HD 209458b大气中来自母星的Lyα通量对Hα吸收光谱的影响的仿真结果。使用三维流体力学代码模拟大气。考虑了高层大气成分的几种选择，包括XUV参数的变化。大气中Lyα光子的传递是通过蒙特卡罗方法进行模拟的。获得了激发到第二能级的氢原子的堆积密度的空间分布。计算出Hα线的吸收光谱。结果表明，可以通过相对简单的高层大气中Lyα光子转移模型来描述热木星在Hα线中的过渡吸收。