Free access article

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. Santos^{1, 2}, S. Udry¹, M. Mayor¹, D. Naef¹, F. Pepe¹, D. Queloz¹, G. Burki¹, N. Cramer¹ and B. Nicolet<sup>1

1</sup>  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 )

Abstract
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, nuno.santos@oal.ul.pt

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© ESO 2003

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