S. G. Sousa, N. C. Santos, M. Mayor, S. Udry, L. Casagrande, G. Israelian, F. Pepe, D. Queloz, M. J. P. F. G. Monteiro
To understand the formation and evolution of solar type stars in the solar neighborhood we need to know their stellar parameters with high accuracy. We present a catalogue with accurate stellar parameters for the 451 stars that compose the HARPS Guaranteed Time Observations (GTO) ``high precision'' sample. The spectroscopic stellar parameters were obtained using a set of high S/N spectra obtained with the HARPS spectrograph. The spectroscopic analysis was done in LTE using a grid of Kurucz atmosphere models and the recent ARES code to measure line equivalent widths. It will be also presented a description of the ARES code, and shown that the results are in very good agreement with the ones presented in other works found in the literature (for stars in common). A useful calibration is also presented for the effective temperature as a function of the index color B-V and [Fe/H].Finally we study the metallicity-planet correlation, namely for very low mass planets. The results presented suggests that contrarily to their Jovian counterparts, Neptune-like planets do not form preferentially around metal-rich stars. These results are discussed in the context of the core-accretion model for planet formation.
XVIII Encontro Nacional de Astronomia e Astrofísica