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Issue A&A
Volume 407, Number 2, August IV 2003
Page(s) 679 - 684
Section Stellar atmospheres
DOI http://dx.doi.org/10.1051/0004-6361:20030815



A&A 407, 679-684 (2003)
DOI: 10.1051/0004-6361:20030815

The CORALIE survey for southern extra-solar planets

X. A Hot Jupiter orbiting HD 73256
S. Udry1, M. Mayor1, J. V. Clausen2, L. M. Freyhammer3, B. E. Helt2, C. Lovis1, D. Naef1, E. H. Olsen2, F. Pepe1, D. Queloz1 and N. C. Santos1, 4

1  Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
2  Niels Bohr Institute for Astronomy, Physics and Geophysics; Astronomical Observatory, Juliane Maries Vej 30, 2100 Copenhagen Ø, Denmark
3  Royal Observatory of Belgium, Ringlaan 3, 1180 Brussel and Vrije Universiteit Brussel, Pleinlaan 2, 1050 Brussels, Belgium
4  Centro de Astronomia e Astrofísica da Universidade de Lisboa, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal

(Received 14 April 2003 / Accepted 27 May 2003)

Abstract
Recent radial-velocity measurements obtained with the CORALIE spectrograph on the 1.2-m Euler Swiss telescope at La Silla unveil the presence of a new Jovian-mass Hot Jupiter around HD 73256. The 1.85- $M_{\rm Jup}$ planet moves on an extremely short-period ( P = 2.5486 d), quasi-circular orbit. The best Keplerian orbital solution is presented together with an unsuccessful photometric planetary-transit search performed with the SAT Danish telescope at La Silla. Over the time span of the observations, the photometric follow-up of the candidate has nevertheless revealed a $P \simeq 14$-d photometric periodicity corresponding to the rotational period of the star. This variation as well as the radial-velocity jitter around the Keplerian solution are shown to be related to the fair activity level known for HD 73256.


Key words: techniques: radial velocities -- techniques: photometric -- stars: binaries: spectroscopic -- stars: individual: HD 73256 -- stars: activity -- stars: planetary systems

Offprint request: S. Udry, stephane.udry@obs.unige.ch

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