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arXiv 2103.05657astro-ph.EP
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岩石系外行星大气层的探测

Detection of an Atmosphere on a Rocky Exoplanet

Mark R. Swain, Raissa Estrela, Gael M. Roudier, Christophe Sotin, Paul Rimmer, Adriana Valio, Robert West, Kyle Pearson, Noah Huber-Feely, Robert T. Zellem

摘要:

我们报告了在一颗岩石系外行星GJ 1132 b上探测到的大气层,该行星在大小和密度方面与地球相似。大气透射光谱使用哈勃WFC 3测量检测,并显示在低平均分子量大气中的气溶胶散射,HCN和CH $_{4}$的光谱特征。我们模拟了大气损失过程,并得出结论,GJ 1132 b可能失去了原始的H/He包层,这表明我们探测到的大气已经重建。我们探讨了H $_{2}$地幔脱气的可能性,以前确定为这颗行星的理论研究的可能性,并发现,从超还原岩浆放气可以产生所观察到的大气。通过这种方式,我们利用观测到的系外行星透射光谱来深入了解类地行星的岩浆成分。在这颗岩石行星上探测到大气层,提出了一种可能性,即许多被认为是次海王星蒸发核心的强辐射超级地球行星,在有利的情况下,可能拥有可探测的大气层。

英文摘要:

We report the detection of an atmosphere on a rocky exoplanet, GJ 1132 b, which is similar to Earth in terms of size and density. The atmospheric transmission spectrum was detected using Hubble WFC3 measurements and shows spectral signatures of aerosol scattering, HCN, and CH$_{4}$ in a low mean molecular weight atmosphere. We model the atmospheric loss process and conclude that GJ 1132 b likely lost the original H/He envelope, suggesting that the atmosphere that we detect has been reestablished. We explore the possibility of H$_{2}$ mantle degassing, previously identified as a possibility for this planet by theoretical studies, and find that outgassing from ultrareduced magma could produce the observed atmosphere. In this way we use the observed exoplanet transmission spectrum to gain insights into magma composition for a terrestrial planet. The detection of an atmosphere on this rocky planet raises the possibility that the numerous powerfully irradiated Super-Earth planets, believed to be the evaporated cores of Sub-Neptunes, may, under favorable circumstances, host detectable atmospheres.

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