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Solar analogs with and without planets: Tc trends and Galactic evolution

Published online by Cambridge University Press:  17 July 2015

V.Zh. Adibekyan ,
J.I. González Hernández ,
E. Delgado Mena ,
S.G. Sousa ,
P. Figueira ,
N.C. Santos  and
G. Israelian
V.Zh. Adibekyan*
Affiliation:
Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal Instituto de Astrofísica e Ciência do Espaço, Universidade do Porto, Rua das Estrelas, PT4150-762 Porto, Portugal
J.I. González Hernández
Affiliation:
Departamento de Astrofísica, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
E. Delgado Mena
Affiliation:
Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal Instituto de Astrofísica e Ciência do Espaço, Universidade do Porto, Rua das Estrelas, PT4150-762 Porto, Portugal
S.G. Sousa
Affiliation:
Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal Instituto de Astrofísica e Ciência do Espaço, Universidade do Porto, Rua das Estrelas, PT4150-762 Porto, Portugal Departamento de Física e Astronomia, Faculdade de Ciências da Universidade do Porto, Portugal
P. Figueira
Affiliation:
Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal Instituto de Astrofísica e Ciência do Espaço, Universidade do Porto, Rua das Estrelas, PT4150-762 Porto, Portugal
N.C. Santos
Affiliation:
Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal Instituto de Astrofísica e Ciência do Espaço, Universidade do Porto, Rua das Estrelas, PT4150-762 Porto, Portugal Departamento de Física e Astronomia, Faculdade de Ciências da Universidade do Porto, Portugal
G. Israelian
Affiliation:
Departamento de Astrofísica, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
*
e-mail: vadibekyan@astro.up.pt
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Abstract

We explore a sample of 148 solar-like stars to search for a possible correlation between the slopes of the abundance trends versus condensation temperature (known as the Tc slope) both with stellar parameters and Galactic orbital parameters in order to understand the nature of the peculiar chemical signatures of these stars and the possible connection with planet formation. We find that the Tc slope correlates at a significant level with the stellar age and the stellar surface gravity. We also find tentative evidence that the Tc slope correlates with the mean galactocentric distance of the stars (Rmean), suggesting that stars that originated in the inner Galaxy have fewer refractory elements relative to the volatile ones. We found that the chemical peculiarities (small refractory-to-volatile ratio) of planet-hosting stars is probably a reflection of their older age and their inner Galaxy origin. We conclude that the stellar age and probably Galactic birth place are key to establish the abundances of some specific elements.

Type
Research Article
Information
European Astronomical Society Publications Series , Volume 68: The Milky Way Unravelled by Gaia: GREAT Science from the Gaia Data Releases , 2014 , pp. 105 - 108
Copyright
© EAS, EDP Sciences, 2015

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References

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