Observatoire de Genève, 51 Ch. des Maillettes, 1290 Sauverny, Switzerland
2 Harvard-Smithsonian Center for Astrophysics, 60 Garden Street, Cambridge, MA-02138, USA
3 School of Physics and Astronomy, Raymond and Beverly Sackler Faculty of Exact Sciences, Tel Aviv University, Tel Aviv 69978, Israel
4 Laboratoire d'Astrophysique, Observatoire de Grenoble, Université J. Fourier, BP 53, 38041 Grenoble, France
5 Observatoire de Haute-Provence, 04870 St-Michel L'Observatoire, France
Corresponding author: D. Naef, firstname.lastname@example.org
Accepted: 18 June 2001
We report the detection of a planetary companion orbiting the solar-type star HD 80606, the brighter component of a wide binary with a projected separation of about 2000 AU. Using high-signal spectroscopic observations of the two components of the visual binary, we show that they are nearly identical. The planet has an orbital period of 111.8 days and a minimum mass of . With e = 0.927, this planet has the highest orbital eccentricity among the extrasolar planets detected so far. We finally list several processes this extreme eccentricity could result from.
Key words: techniques: radial velocities / stars: individual: HD 80606 / stars: individual: HD 80607 / binaries: visual / stars: planetary systems
Based on observations made at the Observatoire de Haute-Provence (French CNRS) and at the W. M. Keck Observatory, which is operated as a scientific partnership among the Californian Institute of Technology, the University of California and the National Aeronautics and Space Administration. The Observatory was made possible by the generous financial support from the W. M. Keck Foundation.
© ESO, 2001