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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. Zucker<sup>3

1</sup>  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 )

Abstract
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: individuals: HD 80606 -- stars: individuals: HD 80607 -- binaries: visual -- extrasolar planets

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

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