HD209458b的大气成分和结构
Atmospheric composition and structure of HD209458b
摘要：
像HD209458 b这样的凌日行星提供了一个独特的机会来仔细研究它们的大气成分和结构。凌日光谱探测白天和黑夜之间的过渡区域，称为临边。我们提出了一个重新分析现有的存档HST/STIS传输光谱的HD209458 b的大气。根据这些观察，我们：识别H2的瑞利散射，推导出钠的绝对丰度并量化其在高层大气中的损耗，提取具有温度反演的平流层T-P剖面，并解释该行星大气中存在TiO和VO分子的宽带散射。
英文摘要：
Transiting planets like HD209458b offer a unique opportunity to scrutinize their atmospheric composition and structure. Transit spectroscopy probes the transition region between the day and night sides, called limb. We present a re-analysis of existing archived HST/STIS transmission spectra of HD209458b's atmosphere. From these observations we: Identify H2 Rayleigh scattering, derive the absolute Sodium abundance and quantify its depletion in the upper atmosphere, extract a stratospheric T-P profile with a temperature inversion and explain broad band absorptions with the presence of TiO and VO molecules in the atmosphere of this planet.
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