论文标题
氢在陆地质量行星上占主导地位：证据，起源和进化
Hydrogen dominated atmospheres on terrestrial mass planets: evidence, origin and evolution
论文作者
论文摘要
发现成千上万的高度辐照，低质量的系外行星已经提出了一个想法，即大气逃生是一个可以推动其进化的重要过程。特别令人感兴趣的是，最近的系外行星探测的推论是，大量的低质量行星具有重要的氢气，即使在低至$ \ sim 2 $ 〜m $ $ _ \ oplus $的质量中也是如此。这些以氢为主的大气的大小表明，这些信封必须是从源自原子盘中积聚的。这种推论与太阳系陆层行星矛盾，该行星在椎间盘分散之前没有达到最终质量，并且只能积聚薄氢的大气层。在这篇综述中，我们讨论了氢质量（$ \ Lessim $ 2〜m $ $ _ \ oplus $）行星的氢气的证据。然后，我们讨论了这些大气的可能起源和演变，重点是由恒星高能发射（X射线和EUV; XUV）驱动的流体动力大气逃生的作用。
The discovery of thousands of highly irradiated, low-mass, exoplanets has led to the idea that atmospheric escape is an important process that can drive their evolution. Of particular interest is the inference from recent exoplanet detections that there is a large population of low mass planets possessing significant, hydrogen dominated atmospheres, even at masses as low as $\sim 2$~M$_\oplus$. The size of these hydrogen dominated atmospheres indicates the the envelopes must have been accreted from the natal protoplanetary disc. This inference is in contradiction with the Solar System terrestrial planets, that did not reach their final masses before disc dispersal, and only accreted thin hydrogen dominated atmospheres. In this review, we discuss the evidence for hydrogen dominated atmospheres on terrestrial mass ($\lesssim$ 2~M$_\oplus$) planets. We then discuss the possible origins and evolution of these atmospheres with a focus on the role played by hydrodynamic atmospheric escape driven by the stellar high-energy emission (X-ray and EUV; XUV).
