标题： 类地超级地球内部、热力学和磁态的新热力学约束 显示英文标题

标题： New thermodynamic constraints on internal, thermal and magnetic states of terrestrial-like Super-Earths

摘要： 确定岩石系外行星的动力学演化需要更好地理解塑造其地质表面、热通量、挥发物和大气成分的关键内部热物理过程。 关于铁和硅酸盐可压缩性、熔融和输运特性的新高压实验正在提供新的约束条件，这要求重新评估超级地球的热演化和磁场模型。 我们研究了质量范围在1到10倍地球质量（ME）之间的这些行星的内部结构、温度分布、热状态和发电机效应。 我们表明，与液相线相比，铁合金和钙钛矿或斯石英硅酸盐在高压下的绝热性较浅，这将允许深层底部岩浆海洋的存在，并且在质量大于4倍地球质量的行星中存在冻结的铁核。 MgO 的存在及其分配可能会改变这一情景。 对于质量更大的行星，液态硅酸盐粘度的显著降低应确保下地幔对流活跃，而铁在高压下的热导率升高则表明质量大于2.5倍地球质量的行星内部核心将是亚绝热且非对流的。 这将阻止更大质量超级地球（SE）中的发电机作用。 我们的结果可能允许一种以矿物物理学为中心的新分类方法来划分类地超级地球。 显示英文摘要

摘要： Ascertaining rocky exoplanets dynamic evolution requires better understanding of key internal thermophysical processes that shaped their geological surfaces, heat fluxes, volatiles and atmospheric content. New high-pressure experiments on iron and silicates compressible, melting and transport properties are providing new constraints that demand reassessments of super-Earths thermal and magnetic evolution models. We examine the interior structure, temperature distribution, thermal states and dynamo action of these planets with masses ranging from 1-10 ME. We show that the shallow adiabaticity of iron-alloys and perovskite or stishovite silicates compared to their liquidus at high pressure would allow for deep basal magma oceans, and frozen iron cores in planets larger than 4 ME. The presence and partitioning of MgO may alter this scenario. For the more massive planets, the dramatic reduction in liquid silicates viscosity should ensure a vigorous convection in the lower mantle, while the rise of iron thermal conductivity under high pressures, is shown to keep the internal cores of planets more massive than 2.5 ME subadiabatic and non-convicting. This will preclude the dynamo action in the more massive super-Earths (SE). Our results could allow a new mineral physics centered classification of terrestrial-like superEarths.