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

N. C. Santos; V. Adibekyan; C. Mordasini; W. Benz; E. Delgado-Mena; C. Dorn; L. Buchhave; P. Figueira; A. Mortier; F. Pepe; A. Santerne; S. G. Sousa; S. Udry

doi:10.1051/0004-6361/201526850

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

N. C. Santos, V. Adibekyan, C. Mordasini, W. Benz, E. Delgado-Mena, C. Dorn, L. Buchhave, P. Figueira, A. Mortier, F. Pepe, A. Santerne, S. G. Sousa, S. Udry

Physics and Astronomy

Research output: Contribution to journal › Letter › peer-review

55 Citations (Scopus)

Abstract

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.

Original language	English
Article number	L13
Journal	Astronomy and Astrophysics
Volume	580
DOIs	https://doi.org/10.1051/0004-6361/201526850
Publication status	Published - 1 Aug 2015

Bibliographical note

Funding Information:
We would like to thank the anonymous referee for the useful comments and suggestions. This work was supported by Fundação para a Ciência e a Tecnologia (FCT) through the research grant UID/FIS/04434/2013. P.F., N.C.S., and S.G.S. also acknowledge support from FCT through Investigador FCT contracts of reference IF/01037/2013, IF/00169/2012, and IF/00028/2014, and POPH/FSE (EC) by FEDER funding through the program “Programa Operacional de Factores de Competitividade COMPETE”. P.F. acknowledges support from FCT in the form of project reference IF/01037/2013CP1191/CT0001. A.S. is supported by the EU under a Marie Curie Intra-European Fellowship for Career Development with reference FP7-PEOPLE-2013-IEF, number 627202. E.D.M. and V.A. acknowledge the support from FCT in form of the grants SFRH/BPD/76606/2011 and SFRH/BPD/70574/2010. This work results within the collaboration of the COST Action TD 1308. C.M. acknowledges the support from the Swiss National Science Foundation under grant BSSGI0_155816. A.M. received funding from the European Union Seventh Framework Program (FP7/2007-2013) under grant agreement number 313014 (ETAEARTH).

Publisher Copyright:
© ESO, 2015.

Keywords

Planetary systems
Planets and satellites: detection
Stars: abundances
Techniques: spectroscopic

ASJC Scopus subject areas

Astronomy and Astrophysics
Space and Planetary Science

Access to Document

10.1051/0004-6361/201526850

Cite this

Santos, N. C., Adibekyan, V., Mordasini, C., Benz, W., Delgado-Mena, E., Dorn, C., 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, Article L13. https://doi.org/10.1051/0004-6361/201526850

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title = "Constraining planet structure from stellar chemistry: The cases of CoRoT-7, Kepler-10, and Kepler-93",

abstract = "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.",

keywords = "Planetary systems, Planets and satellites: detection, Stars: abundances, Techniques: spectroscopic",

author = "Santos, {N. C.} and V. Adibekyan and C. Mordasini and W. Benz and E. Delgado-Mena and C. Dorn and L. Buchhave and P. Figueira and A. Mortier and F. Pepe and A. Santerne and Sousa, {S. G.} and S. Udry",

note = "Funding Information: We would like to thank the anonymous referee for the useful comments and suggestions. This work was supported by Funda{\c c}{\~a}o para a Ci{\^e}ncia e a Tecnologia (FCT) through the research grant UID/FIS/04434/2013. P.F., N.C.S., and S.G.S. also acknowledge support from FCT through Investigador FCT contracts of reference IF/01037/2013, IF/00169/2012, and IF/00028/2014, and POPH/FSE (EC) by FEDER funding through the program “Programa Operacional de Factores de Competitividade COMPETE”. P.F. acknowledges support from FCT in the form of project reference IF/01037/2013CP1191/CT0001. A.S. is supported by the EU under a Marie Curie Intra-European Fellowship for Career Development with reference FP7-PEOPLE-2013-IEF, number 627202. E.D.M. and V.A. acknowledge the support from FCT in form of the grants SFRH/BPD/76606/2011 and SFRH/BPD/70574/2010. This work results within the collaboration of the COST Action TD 1308. C.M. acknowledges the support from the Swiss National Science Foundation under grant BSSGI0_155816. A.M. received funding from the European Union Seventh Framework Program (FP7/2007-2013) under grant agreement number 313014 (ETAEARTH). Publisher Copyright: {\textcopyright} ESO, 2015.",

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TY - JOUR

T1 - Constraining planet structure from stellar chemistry

T2 - The cases of CoRoT-7, Kepler-10, and Kepler-93

AU - Santos, N. C.

AU - Adibekyan, V.

AU - Mordasini, C.

AU - Benz, W.

AU - Delgado-Mena, E.

AU - Dorn, C.

AU - Buchhave, L.

AU - Figueira, P.

AU - Mortier, A.

AU - Pepe, F.

AU - Santerne, A.

AU - Sousa, S. G.

AU - Udry, S.

N1 - Funding Information: We would like to thank the anonymous referee for the useful comments and suggestions. This work was supported by Fundação para a Ciência e a Tecnologia (FCT) through the research grant UID/FIS/04434/2013. P.F., N.C.S., and S.G.S. also acknowledge support from FCT through Investigador FCT contracts of reference IF/01037/2013, IF/00169/2012, and IF/00028/2014, and POPH/FSE (EC) by FEDER funding through the program “Programa Operacional de Factores de Competitividade COMPETE”. P.F. acknowledges support from FCT in the form of project reference IF/01037/2013CP1191/CT0001. A.S. is supported by the EU under a Marie Curie Intra-European Fellowship for Career Development with reference FP7-PEOPLE-2013-IEF, number 627202. E.D.M. and V.A. acknowledge the support from FCT in form of the grants SFRH/BPD/76606/2011 and SFRH/BPD/70574/2010. This work results within the collaboration of the COST Action TD 1308. C.M. acknowledges the support from the Swiss National Science Foundation under grant BSSGI0_155816. A.M. received funding from the European Union Seventh Framework Program (FP7/2007-2013) under grant agreement number 313014 (ETAEARTH). Publisher Copyright: © ESO, 2015.

PY - 2015/8/1

Y1 - 2015/8/1

N2 - 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.

AB - 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.

KW - Planetary systems

KW - Planets and satellites: detection

KW - Stars: abundances

KW - Techniques: spectroscopic

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U2 - 10.1051/0004-6361/201526850

DO - 10.1051/0004-6361/201526850

M3 - Letter

AN - SCOPUS:84939600881

SN - 0004-6361

VL - 580

JO - Astronomy and Astrophysics

JF - Astronomy and Astrophysics

M1 - L13

ER -

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

Abstract

Bibliographical note

Keywords

ASJC Scopus subject areas

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