论文标题
预测陆生外行星的水含量多样性
Predicted diversity in water content of terrestrial exoplanets orbiting M dwarfs
论文作者
论文摘要
M矮人周围的系外行星调查检测到越来越多的具有地球可溶解的系外行星。预计其中一些行星是岩石行星，具有有利于表面液态水的温带气候。但是，各种模型预测，在M矮人周围经典宜居区绕着沿着经典的陆地行星没有水或太多的水，这表明M矮人周围可居住的行星可能很少。在这里，我们介绍了一个更新的行星种群合成模型的结果，该模型包括原始大气中水的影响，这是由来自传入的行星和岩浆海洋中的岩石材料和岩石海洋氧化引起的。我们发现，发现原始气氛中的水生产会显着影响陆地岩石泥土行星的发生，从而产生多种水含量的岩石行星。我们估计有5-10％的行星尺寸$ <1.3 r_ \ oplus $旋转的早期至中间的行星具有适当数量的海水以供居住。这样的发生率将足够高，可以通过持续和近乎未来的M-warf行星调查任务来检测潜在的可居住行星。
Exoplanet surveys around M dwarfs have detected a growing number of exoplanets with Earth-like insolation. It is expected that some of those planets are rocky planets with the potential for temperate climates favourable to surface liquid water. However, various models predict that terrestrial planets orbiting in the classical habitable zone around M dwarfs have no water or too much water, suggesting that habitable planets around M dwarfs might be rare. Here we present the results of an updated planetary population synthesis model, which includes the effects of water enrichment in the primordial atmosphere, caused by the oxidation of atmospheric hydrogen by rocky materials from incoming planetesimals and from the magma ocean. We find that this water production in the primordial atmosphere is found to significantly impact the occurrence of terrestrial rocky aqua planets, yielding ones with diverse water content. We estimate that 5-10% of the planets with a size $<1.3 R_\oplus$ orbiting early-to-mid M dwarfs have appropriate amounts of seawater for habitability. Such an occurrence rate would be high enough to detect potentially habitable planets by ongoing and near-future M-dwarf planet survey missions.
