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Astron. Astrophys. 356, 590-598 (2000)

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The CORALIE survey for southern extra-solar planets

II. The short-period planetary companions to HD 75289 and HD 130322 *

S. Udry 1, M. Mayor 1, D. Naef 1, F. Pepe 1, D. Queloz 1,2, N.C. Santos 1, M. Burnet 1, B. Confino 3 and C. Melo 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, 3961 St-Luc, Switzerland

Received 2 December 1999 / Accepted 28 January 2000

Abstract

Doppler measurements from the high-resolution CORALIE spectrometer of the stars HD 75289 and HD 130322 reveal 2 new extra-solar giant planets. They are the second and third planetary candidates discovered with CORALIE in less than 1 year, since its installation on the 1.2-m Euler Swiss telescope at La Silla. The minimum mass of the planet around HD 75289 ([FORMULA] = 0.42 [FORMULA]) is the lightest found to date for a solar-type star companion. The orbital period is 3.5 days and the orbit is circular. The second candidate, a Jupiter-mass planet, orbits HD 130322 in 10.72 days, on an almost circular trajectory. Due to their small orbital periods, both planets belong to the hot Jupiter family, increasing thus the already large number of known Jupiter sized planets with orbits much smaller than in the solar system.

Key words: techniques: radial velocities – binaries: spectroscopic – stars: individual: HD 75289 – stars: individual: HD 130322 – stars: activity – planetary systems

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

Send offprint requests to: stephane.udry@obs.unige.ch

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© European Southern Observatory (ESO) 2000

Online publication: April 10, 2000
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