Constraints on Super-Earth Interiors from Stellar Abundances

被引:54
|
作者
Brugger, B. [1 ]
Mousis, O. [1 ]
Deleuil, M. [1 ]
Deschamps, F. [2 ]
机构
[1] Aix Marseille Univ, CNRS, LAM, Marseille, France
[2] Acad Sinica, Inst Earth Sci, 128 Acad Rd Sect 2, Taipei 11529, Taiwan
来源
ASTROPHYSICAL JOURNAL | 2017年 / 850卷 / 01期
关键词
Earth; planets and satellites: composition; planets and satellites: individual (CoRoT-7b; Kepler-10b; Proxima Centauri b); planets and satellites: interiors; POST-PEROVSKITE PHASE; EQUATION-OF-STATE; CHEMICAL-COMPOSITION; PLANETS; RADIUS; MASS; SEARCH; MODELS; CURVE;
D O I
10.3847/1538-4357/aa965a
中图分类号
P1 [天文学];
学科分类号
0704 ;
摘要
Modeling the interior of exoplanets is essential to go further than the conclusions provided by mean density measurements. In addition to the still limited precision on the planets' fundamental parameters, models are limited by the existence of degeneracies on their compositions. Here, we present a model of internal structure dedicated to the study of solid planets up to similar to 10 Earth masses, i.e., super-Earths. When the measurement is available, the assumption that the bulk Fe/Si ratio of a planet is similar to that of its host star allows us to significantly reduce the existing degeneracy and more precisely constrain the planet's composition. Based on our model, we provide an update of the mass-radius relationships used to provide a first estimate of a planet's composition from density measurements. Our model is also applied to the cases of two well-known exoplanets, CoRoT-7b and Kepler-10b, using their recently updated parameters. The core mass fractions of CoRoT-7b and Kepler-10b are found to lie within the 10%-37% and 10%-33% ranges, respectively, allowing both planets to be compatible with an Earth-like composition. We also extend the recent study of Proxima Centauri b and show that its radius may reach 1.94 R-circle plus in the case of a 5 M-circle plus planet, as there is a 96.7% probability that the real mass of Proxima Centauri b is below this value.
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页数:12
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