Bibcode
González Hernández, J. I.; Israelian, G.; Santos, N. C.; Sousa, S.; Delgado-Mena, E.; Neves, V.; Udry, S.
Bibliographical reference
16th Cambridge Workshop on Cool Stars, Stellar Systems, and the Sun. ASP Conference Series, Vol. 448, proceedings of a conference held August 28- September 2, 2010 at the University of Washington, Seattle, Washington. Edited by Christopher M. Johns-Krull, Matthew K. Browning, and Andrew A. West. San Francisco: Astronomical Society of the Pacific, 2012., p.879
Advertised on:
12
2011
Citations
3
Refereed citations
3
Description
We present the abundances of volatile and refractory elements in the
atmospheres of 95 solar analogs, 24 planet hosts and 71 "single" stars,
to investigate its possible connection with terrestial planets, using
very high-quality HARPS and UVES spectra. The whole sample of stars with
and without planets show almost the same mean abundance pattern. In
particular, this sample contains seven solar twins which provide very
similar mean abundance ratios for both stars with and without planets.
In addition, we select sub-sample of 28 solar analogs, with 14 stars
with and 14 without planets, at super-solar metallicity, and again we do
not find any significant difference. For this sub-sample of stars we
derive the slopes of the [X/Fe] abundance ratios as a function of the
condensation temperature, TC. Most of them have the opposite
sign as that expected from a possible signature of terrestial planets.
Two metal-rich stars of this sub-sample which host each of them a
super-Earth-like planet, show an abundance pattern which would not
suggest the existence of any terrestial planet. We demonstrate that
these slopes get almost null values when removing the Galactic chemical
evolution trends, which may indicate that any possible difference in
volatile-to-refratory abundance ratios is probably not related to the
presence of terrestial planets.