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Detailed chemical abundances of solar analogs with and without planets: no terrestial planet connection

J. I. González Hernández, G. Israelian, N. C. Santos, S. G. Sousa, E. Delgado Mena, V. Neves, S. Udry

We present the detailed chemical abundance patterns of 95 solar analogs, 24 hosting planets and 71 without detected planets, using very high-quality HARPS and UVES spectra. We explore the possibility that the presence of terrestial planets could affect the volatile-to-refratory abundance ratios. We do not see any clear difference between the stars with and without planets, either in solar twins or in the whole sample of solar analogs. We also select a sub-sample of 28 solar analogs, 14 with and 14 without planets, in the metallicity range 0.14< [Fe/H]}<0.36 and find the same abundance pattern for both star with and without planets. In particular, two of the planetary systems, which contain each of them a Super-Earth like planet, show abundance patterns not consistent with the presence of terrestial planets. We demonstrate that the Galactic chemical evolution effects are probably responsible for any possible difference in mean abundances of refratory and volatile elements in these solar analogs with respect to the solar values.

Highlights of Spanish Astrophysics VI, Proceedings of the IX Scientific Meeting of the Spanish Astronomical Society (SEA), held in Madrid, September 13 - 17, 2010
M. R. Zapatero Osorio, J. Gorgas, J. Maíz Apellániz, J. R. Pardo, A. Gil de Paz

Sociedad Española de Astronomía, Page 576
2011 November

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Faculdade de Ciências da Universidade de Lisboa Universidade do Porto Faculdade de Ciências e Tecnologia da Universidade de Coimbra
Fundação para a Ciência e a Tecnologia COMPETE 2020 PORTUGAL 2020 União Europeia