J. I. González Hernández, G. Israelian, N. C. Santos, S. G. Sousa, E. Delgado Mena, V. Neves, S. Udry
Abstract
We have analysed very high-quality HARPS and UVES spectra of 95 solar analogs, 24 hosting planets and 71 without detected planets, to search for any possible signature of terrestial planets in the chemical abundances of volatile and refractory elements with respect to the solar abundances.
We demonstrate that stars with and without planets in this sample show similar mean abundance ratios, in particular, a sub-sample of 14 planet-host and 14 “single” solar analogs in the metallicity range 0.14 < [Fe/H] < 0.36. In addition, two of the planetary systems in this subsample, containing each of them a super-Earth-like planet with masses in the range ~ 7 - 11 Earth masses, have different volatile-to-refratory abundance ratios to what would be expected from the presence of a terrestial planets.
Finally, we check that after removing the Galactic chemical evolution effects any possible difference in mean abundances, with respect to solar values, of refratory and volatile elements practically dissappears.
Keywords
stars: abundances, stars: fundamental parameters, planetary systems, planetary systems: formation, stars: atmospheres
The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution
Proceedings IAU Symposium No. 276
A. Sozzetti, M. G. Lattanzi, A. P. Boss
Cambridge University Press
276
Volume 6, Page 422
2011 November
