超地球系外行星的大气质量和成分范围
Ranges of Atmospheric Mass and Composition of Super Earth Exoplanets
摘要：
类地系外行星可能从三个主要来源获得大气：捕获星云气体，吸积过程中的脱气，以及随后的构造活动脱气。在这里，我们在吸积过程中的脱气模型，以估计范围从1到30地球质量的系外行星上的大气质量和成分。我们使用原始和差异化的陨石成分绘制的散装成分。单独的脱气可以产生各种质量的行星大气，范围从小于行星总质量的百分之一到约6质量%的氢、约20质量%的水和/或约5质量%的碳化合物。富含氢的大气可以通过水氧化金属铁而脱气，过量的水和碳可以通过简单的脱气产生大气。作为我们大气释气模型的副产品，我们发现适度的初始水含量（占行星质量的10%及以上）在吸积完成后不久就会产生具有深层表面液态水海洋的行星。
英文摘要：
Terrestrial-like exoplanets may obtain atmospheres from three primary sources: Capture of nebular gases, degassing during accretion, and degassing from subsequent tectonic activity. Here we model degassing during accretion to estimate the range of atmospheric mass and composition on exoplanets ranging from 1 to 30 Earth masses. We use bulk compositions drawn from primitive and differentiated meteorite compositions. Degassing alone can create a wide range of masses of planetary atmospheres, ranging from less than a percent of the planet's total mass up to ~6 mass% of hydrogen, ~20 mass% of water, and/or ~5 mass% of carbon compounds. Hydrogen-rich atmospheres can be outgassed as a result of oxidizing metallic iron with water, and excess water and carbon can produce atmospheres through simple degassing. As a byproduct of our atmospheric outgassing models we find that modest initial water contents (10 mass% of the planet and above) create planets with deep surface liquid water oceans soon after accretion is complete.
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