论文标题
辐照的海洋行星桥梁超级地球和亚纽马人口
Irradiated ocean planets bridge super-Earth and sub-Neptune populations
论文作者
论文摘要
小行星（$ \ sim $ 1--3.9 $ \ hinth $）构成了迄今为止发现的4000多个系外行星库存的一半以上。较小的行星足够致密，可以是岩石的，但是在许多情况下，那些半径大于$ \ sim $ 1.6 $ \ histth $被认为可以显示氢/氦气气体封锁，最高$ \ sim $ 30 \％$ 30 \％。这些低质量行星是高度辐照的，其起源，进化和可能的联系的问题仍然开放。在这里，我们表明，受温室效应影响的近距离海洋行星在超临界状态下显示水圈，该水圈会产生膨胀的大气，而不会引起大型氢/氦气态信封的存在。我们为具有不同组成和不同平衡温度的海洋行星提供了一组新的质量 - 拉迪乌斯关系，发现这些关系非常适合低密度的亚新持久行星。我们的模型表明，超级诞生和富含水的亚核可能属于同一行星家族，即无氢/氦的行星，其内部之间的差异仅仅是由于水含量的变化而导致的。
Small planets ($\sim$1--3.9 $\Rearth$) constitute more than half of the inventory of the 4000-plus exoplanets discovered so far. Smaller planets are sufficiently dense to be rocky, but those with radii larger than $\sim$1.6 $\Rearth$ are thought to display in many cases hydrogen/helium gaseous envelopes up to $\sim$30\% of the planetary mass. These low-mass planets are highly irradiated and the question of their origin, evolution, and possible links remains open. Here we show that close-in ocean planets affected by greenhouse effect display hydrospheres in supercritical state, which generate inflated atmospheres without invoking the presence of large hydrogen/helium gaseous envelopes. We present a new set of mass-radius relationships for ocean planets with different compositions and different equilibrium temperatures, which are found to be well adapted to low-density sub-Neptune planets. Our model suggests that super-Earths and water-rich sub-Neptunes could belong to the same family of planets, i.e. hydrogen/helium-free planets, with differences between their interiors simply resulting from the variation in the water content.
