Structural and thermal models of rocky planets and solid exoplanets

该项目的目的是建立超级地球制度中给定质量和半径的类地类行星的内部结构和热收支模型，以及类海王星行星的岩石/金属核心的模型。固体的结构模型是化学分层的，由挥发性成分、成岩元素和金属(如铁)组成，后者集中在中心核心。在第一个供资期间，这些模型的参数将以热传导和膨胀率等热和传输性质、状态方程和相图数据为基础，这些数据将通过从头计算(SP1、SP2)和高压缩比下固体和液体的实验室实验(SP7、SP8)，在本研究股的其他次级项目内反复加以改进。由于压力对粘性的影响，大质量超地球的硅酸盐地幔中的对流能量传输可能是无效的，因此我们将详细研究内部产热、长期冷却和本征光度或表面热流之间的相互作用。为了部分克服模型的模糊性，将与子项目SP5和SP6密切合作，使用计算的密度分布来确定长期或流动的勒夫数k_{2，f}。后者是质量向中心集中的重要量度，与受行星自转和潮汐影响的关键观测参数有关(SP6)。通过这种方式，我们希望得到经过其宿主恒星的近距离固态系外行星的质量、半径、内部分化度、体积组成和热收支之间的新的、改进的关系。

The project is aimed at the construction of models of the interior structure and thermal budget of generic terrestrial-type planets of given mass and radius in the super-Earth regime and of rock/metal cores of Neptune-like planets. Structural models of solid bodies are chemically layered and composed of volatile constituents, rock-forming elements, and metals such as iron, the latter concentrated in central cores. In the first funding period, the parameterization of these models will be based on thermal and transport properties such as thermal conductivity and expansivity, equation-of-state and phase diagram data that will be iteratively improved within other subprojects of this Research Unit through ab initio calculations (SP1, SP2) and laboratory experiments (SP7, SP8) of solid and liquid matter at high compression ratios. Since the convective energy transport in the silicate mantles of massive super-Earths could be inefficient owing to pressure effects on viscosity, the interplay between internal heat production, secular cooling and intrinsic luminosity or surface heat flow will be studied in detail. To partly overcome model ambiguities, the calculated density profiles will be used to determine in close collaboration with subprojects SP5 and SP6 the secular or fluid Love number k_{2,f}. The latter is an important measure for the concentration of mass toward the center and related to key observational parameters affected by planetary rotation and tides (SP6). In this way, we expect to derive novel, improved relationships between mass, radius, degree of internal differentiation, bulk composition and thermal budget of close-in solid exoplanets transiting their host stars.