铁在金属氢中的溶解度与巨行星致密核的稳定性
Solubility of Iron in Metallic Hydrogen and Stability of Dense Cores in Giant Planets
摘要：
在我们的太阳系中，巨大行星的形成，以及大部分巨大的系外行星的形成，通常被解释为星云中的氢和氦吸积到一个类似地球成分的大核心上。这个核心的命运对地球内部结构的演变有着重要的影响。最近的研究表明，H2O、MgO和SiO2在高温高压下溶解在液态金属氢中。在这项研究中，我们进行从头计算来研究最内层金属核的溶解度。我们发现溶解铁是强烈的青睐以上2000 K在整个压力范围内（0.4-4 TPa）考虑。我们比较和总结其他可能的核心成分的溶解度的结果。计算结果表明，巨行星的核心与周围的层处于热力学不平衡状态，促进了重元素的侵蚀和重新分布。铁和岩石之间溶解度行为的差异可能会影响内部的演化，特别是对于土星质量的行星。了解铁和其他重元素在气体巨星中的分布，可能有助于理解质量-半径关系，以及纯氢氦混合物的输运性质偏差。
英文摘要：
The formation of the giant planets in our solar system, and likely a majority of giant exoplanets, is commonly explained by the accretion of nebular hydrogen and helium onto a large core of terrestrial-like composition. The fate of this core has important consequences for the evolution of the interior structure of the planet. It has recently been shown that H2O, MgO and SiO2 dissolve in liquid metallic hydrogen at high temperature and pressure. In this study, we perform ab initio calculations to study the solubility of an innermost metallic core. We find dissolution of iron to be strongly favored above 2000 K over the entire pressure range (0.4-4 TPa) considered. We compare with and summarize the results for solubilities on other probable core constituents. The calculations imply that giant planet cores are in thermodynamic disequilibrium with surrounding layers, promoting erosion and redistribution of heavy elements. Differences in solubility behavior between iron and rock may influence evolution of interiors, particularly for Saturn-mass planets. Understanding the distribution of iron and other heavy elements in gas giants may be relevant in understanding mass-radius relationships, as well as deviations in transport properties from pure hydrogen-helium mixtures.
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