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Astron. Astrophys. 354, 99-102 (2000)


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The CORALIE survey for southern extra-solar planets

I. A planet orbiting the star Gliese 86 *

D. Queloz 1,2, M. Mayor 1, L. Weber 1, A. Blécha 1, M. Burnet 1, B. Confino 3, D. Naef 1, F. Pepe 1, N. Santos 1 and S. Udry 1

1 Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
2 Jet Propulsion Laboratory, Mail-Stop: 306-388, 4800 Oak Grove Drive, Pasadena, CA 91109, USA
3 St-Luc Observatory, Switzerland

Received 22 April 1999 / Accepted 1 October 1999

Abstract

A 4 MJ planet with a 15.8 day orbital period has been detected from very precise radial velocity measurements with the CORALIE echelle spectrograph. A second remote and more massive companion has also been detected.

All the planetary companions so far detected in orbit closer than 0.08 AU have a parent star with a statistically higher metal content compared to the metallicity distribution of other stars with planets. Different processes occuring during their formation may provide a possible explanation for this observation.

Key words: stars: planetary systems – stars: individual: GJ 86 – stars: low-mass, brown dwarfs – stars: binaries: spectroscopic

* Based on observations collected at the La Silla Observatory, ESO Chile, with the echelle spectrograph CORALIE at the 1.2m Euler Swiss telescope

Send offprint requests to: Didier.Queloz@obs.unige.ch

© European Southern Observatory (ESO) 2000

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