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

V.Zh. Adibekyan; J.I. González Hernández; E. Delgado Mena; S.G. Sousa; P. Figueira; N.C. Santos; G. Israelian

doi:10.1051/eas/1567018

All issues

Volume 67-68 (2014)

EAS Publications Series, 67-68 (2014) 105-108

Abstract

Issue		EAS Publications Series Volume 67-68, 2014 The Milky Way Unravelled by Gaia: GREAT Science from the Gaia Data Releases


Page(s)		105 - 108
Section		Planetary Systems: Words Near and Far
DOI		https://doi.org/10.1051/eas/1567018
Published online		17 July 2015

The Milky Way Unravelled by Gaia: GREAT Science from the Gaia Data Releases
N.A. Walton, F. Figueras, L. Balaguer-Núñez and C. Soubiran (eds)
EAS Publications Series, 67–68 (2014) 105-108

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

V.Zh. Adibekyan¹^,2, J.I. González Hernández³^,4, E. Delgado Mena¹^,2, S.G. Sousa¹^,2^,5, P. Figueira¹^,2, N.C. Santos¹^,2^,5 and G. Israelian³^,4

¹ Centro de Astrofísica da Universidade do Porto, Rua das Estrelas, 4150-762 Porto, Portugal
² Instituto de Astrofísica e Ciência do Espaço, Universidade do Porto, Rua das Estrelas, PT4150-762 Porto, Portugal
³ Departamento de Astrofísica, Universidad de La Laguna, 38206 La Laguna, Tenerife, Spain
⁴ Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
⁵ Departamento de Física e Astronomia, Faculdade de Ciências da Universidade do Porto, Portugal

e-mail: vadibekyan@astro.up.pt

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 T_c 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 T_c slope correlates at a significant level with the stellar age and the stellar surface gravity. We also find tentative evidence that the T_c slope correlates with the mean galactocentric distance of the stars (R_mean), 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.