Constraining planet structure from stellar chemistry : the cases of CoRoT-7, Kepler-10, and Kepler-93
Constraining planet structure from stellar chemistry : the cases of CoRoT-7, Kepler-10, and Kepler-93
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DOI：
10.1051/0004-6361/201526850
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发表时间：
2015-07
影响因子：
6.5
通讯作者：
Nuno C. Santos;V. Adibekyan;C. Mordasini;Willy Benz;E. Delgado-Mena;C. Dorn;L. Buchhave;L. Buchhave;P. Figueira;A. Mortier;F. Pepe;A. Santerne;S. Sousa;S. Udry
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作者：
Nuno C. Santos;V. Adibekyan;C. Mordasini;Willy Benz;E. Delgado-Mena;C. Dorn;L. Buchhave;L. Buchhave;P. Figueira;A. Mortier;F. Pepe;A. Santerne;S. Sousa;S. Udry
目标。我们探讨的可能性，恒星的相对丰度的不同物种可以用来限制大量的已知凌日岩石行星的丰度。方法.我们使用高分辨率的光谱，以获得恒星的参数和化学丰度的铁，硅，镁，O和C在三个恒星托管低质量，岩石行星：CoRoT-7，开普勒-10，开普勒-93。这些行星在质量半径图上沿着同一条沿着，指向相似的组成。导出的丰度比与太阳值进行了比较。用一个简单的化学计量模型，我们估计在每个行星的铁质量分数，假设恒星的组成。结果我们表明，在所有情况下，从质量半径关系推断的铁质量分数似乎是在很好的协议与来自主机星星的光球组成的铁丰度。结论.结果表明，恒星丰度可以用来增加对轨道岩石行星组成的限制。
Aims. We explore the possibility that the stellar relative abundances of di erent species can be used to constrain the bulk abundances of known transiting rocky planets. Methods. We use high resolution spectra to derive stellar parameters and chemical abundances for Fe, Si, Mg, O, and C in three stars hosting low mass, rocky planets: CoRoT-7, Kepler-10, and Kepler-93. These planets follow the same line along the mass-radius diagram, pointing toward a similar composition. The derived abundance ratios are compared with the solar values. With a simple stoichiometric model, we estimate the iron mass fraction in each planet, assuming stellar composition. Results. We show that in all cases, the iron mass fraction inferred from the mass-radius relationship seems to be in good agreement with the iron abundance derived from the host star’s photospheric composition. Conclusions. The results suggest that stellar abundances can be used to add constraints on the composition of orbiting rocky planets.