Constraining planet structure from stellar chemistry: the cases of CoRoT-7, Kepler-10, and Kepler-93

Santos, N. C.; Adibekyan, V.; Mordasini, Christoph; Benz, Willy; Delgado-Mena, E.; Dorn, Caroline; Buchhave, L.; Figueira, P.; Mortier, A.; Pepe, F.; Santerne, A.; Sousa, S. G.; Udry, S. (2015). Constraining planet structure from stellar chemistry: the cases of CoRoT-7, Kepler-10, and Kepler-93. Astronomy and astrophysics, 580, L13. EDP Sciences 10.1051/0004-6361/201526850

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Aims. We explore the possibility that the stellar relative abundances of different 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.

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences > Theoretical Astrophysics and Planetary Science (TAPS)
08 Faculty of Science > Physics Institute > Space Research and Planetary Sciences

UniBE Contributor:

Mordasini, Christoph; Benz, Willy and Dorn, Caroline

Subjects:

500 Science > 530 Physics

ISSN:

0004-6361

Publisher:

EDP Sciences

Language:

English

Submitter:

Katharina Weyeneth-Moser

Date Deposited:

10 Jun 2016 13:27

Last Modified:

19 Sep 2016 02:25

Publisher DOI:

10.1051/0004-6361/201526850

Web of Science ID:

000360020200158

ArXiv ID:

1507.08081v1

BORIS DOI:

10.7892/boris.81710

URI:

https://boris.unibe.ch/id/eprint/81710

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