EDP Sciences
Free access
Issue
A&A
Volume 398, Number 1, January IV 2003
Page(s) 363 - 376
Section The Sun
DOI http://dx.doi.org/10.1051/0004-6361:20021637


A&A 398, 363-376 (2003)
DOI: 10.1051/0004-6361:20021637

Statistical properties of exoplanets

II. Metallicity, orbital parameters, and space velocities
N. C. Santos1, G. Israelian2, M. Mayor1, R. Rebolo2, 3 and S. Udry1

1  Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
2  Instituto de Astrofísica de Canarias, 38200 La Laguna, Tenerife, Spain
3  Consejo Superior de Investigaciones Científicas, Spain

(Received 19 September 2002 / Accepted 7 November 2002 )

Abstract
In this article we present a detailed spectroscopic analysis of more than 50 extra-solar planet host stars. Stellar atmospheric parameters and metallicities are derived using high resolution and high S/N spectra. The spectroscopy results, added to the previous studies, imply that we have access to a large and uniform sample of metallicities for about 80 planet hosts stars. We make use of this sample to confirm the metal-rich nature of stars with planets, and to show that the planetary frequency is rising as a function of the [Fe/H]. Furthermore, the source of this high metallicity is shown to have most probably a "primordial" source, confirming previous results. The comparison of the orbital properties (period and eccentricity) and minimum masses of the planets with the stellar properties also reveal some emerging but still not significant trends. These are discussed and some explanations are proposed. Finally, we show that the planet host stars included in the CORALIE survey have similar kinematical properties as the whole CORALIE volume-limited planet search sample. Planet hosts simply seem to occupy the metal-rich envelope of this latter population.


Key words: stars: abundances -- stars: fundamental parameters -- stars: chemically peculiar -- stars: evolution -- planetary systems -- solar neighborhood

Offprint request: Nuno C. Santos, Nuno.Santos@obs.unige.ch

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