EDP Sciences
Free Access
Volume 375, Number 2, August IV 2001
Page(s) L27 - L30
Section Letters
DOI https://doi.org/10.1051/0004-6361:20010853
Published online 15 August 2001

A&A 375, L27-L30 (2001)
DOI: 10.1051/0004-6361:20010853

HD 80606 b, a planet on an extremely elongated orbit

D. Naef1, D. W. Latham2, M. Mayor1, T. Mazeh3, J. L. Beuzit4, G. A. Drukier3, C. Perrier-Bellet4, D. Queloz1, J. P. Sivan5, G. Torres2, S. Udry1 and S. Zucker3

1  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

(Received 29 May 2001 / 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 $3.9 {M_{\rm Jup}}$. 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: individuals: HD 80606 -- stars: individuals: HD 80607 -- binaries: visual -- extrasolar planets

Offprint request: D. Naef, dominique.naef@obs.unige.ch

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