Free Access
Volume 406, Number 1, July IV 2003
Page(s) 373 - 381
Section The Sun
Published online 17 November 2003

A&A 406, 373-381 (2003)
DOI: 10.1051/0004-6361:20030776

The CORALIE survey for southern extra-solar planets

XI. The return of the giant planet orbiting HD 192263
N. C. Santos1, 2, S. Udry1, M. Mayor1, D. Naef1, F. Pepe1, D. Queloz1, G. Burki1, N. Cramer1 and B. Nicolet1

1  Observatoire de Genève, 51 ch. des Maillettes, 1290 Sauverny, Switzerland
2  Centro de Astronomia e Astrofísica da Universidade de Lisboa, Observatório Astronómico de Lisboa, Tapada da Ajuda, 1349-018 Lisboa, Portugal

(Received 16 April 2003 / Accepted 15 May 2003 )

The presence of a planet around the K dwarf HD 192263 was recently called into question by the detection of a periodic photometric signal with the same period as the one observed in radial velocity. In this paper, we investigate this possibility, using a combination of radial-velocity, photometry, and bisector measurements obtained simultaneously. The results show that while the observed radial-velocity variation is always very stable in phase, period, and amplitude, the photometric signal changes with time. The combined information strongly suggests that the observed radial-velocity variation is being produced by the presence of a planet, as firstly proposed. The photometric variations are either not connected to the planetary companion, or can eventually be induced by the interaction between the planet and the star. Finally, the radial-velocity data further show the presence of a long term trend, whose origin, still not clear, might be related to the presence of another companion to the system.

Key words: planetary systems -- stars: individual: HD 192263

Offprint request: N. C. Santos,

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© ESO 2003

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