Bibcode
González Hernández, J. I.; Israelian, G.; Santos, Nuno C.; Sousa, Sergio; Delgado-Mena, Elisa; Neves, Vasco; Udry, Stéphane
Bibliographical reference
The Astrophysics of Planetary Systems: Formation, Structure, and Dynamical Evolution, Proceedings of the International Astronomical Union, IAU Symposium, Volume 276, p. 422-423
Advertised on:
11
2011
Citations
6
Refereed citations
4
Description
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 sub-sample, 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.