Revising the metallicity-planet correlation

S. G. Sousa, N. C. Santos, G. Israelian, M. Mayor, S. Udry

Abstract.
To understand the formation and evolution of solar-type stars and planets in the solar neighborhood, we need to obtain their stellar parameters with high precision. We present a catalog of precise stellar parameters for the FGK stars in a volume limited sample followed by the HARPS spectrograph in the quest for extra solar planets. The spectroscopic analysis was completed assuming LTE with a grid of Kurucz atmosphere models and using the ARES code for an automatic measurement of the line equivalent widths. The results are compared against different independent methods and also with other values that are found in the literature for common stars. Both comparisons are consistent and show the homogeneity of the parameters derived by our team. The derived metallicities in this sample reveal a somewhat different distribution for the present planet hosts, but still indicates the already know higher frequency of planets observed for the more metal rich stars. We combine the results derived in this sample with the one from CORALIE survey to present the largest homogeneous spectroscopic study of the metallicity-giant planet relation.

Extreme Solar Systems II
Moran, Wyoming, U.S.A.
September 2011

Type: Poster