Letter to the Editor
D. Queloz1, D. Anderson2, A. Collier Cameron3, M. Gillon4, L. Hebb3, C. Hellier2, P. Maxted2, F. Pepe1, D. Pollacco5, D. Ségransan1, B. Smalley2, A. H. M. J. Triaud1, S. Udry1 and R. West6
Observatoire Astronomique de l'Université de Genève, Chemin des Maillettes 51, 1290 Sauverny, Switzerland e-mail: Didier.Queloz@unige.ch
2 Astrophysics Group, Keele University, Staffordshire, ST55BG, UK
3 School of Physics & Astronomy, University of St Andrews, North Haugh, KY16 9SS, St Andrews, Fife, Scotland, UK
4 Institut d'Astrophysique et de Géophysique, Université de Liège, Allée du 6 Août, 17, Bat. B5C, Liège 1, Belgium
5 Astrophysics Research Centre, School of Mathematics & Physics, Queens University, University Road, Belfast, BT71NN, UK
6 Department of Physics and Astronomy, University of Leicester, Leicester, LE17RH, UK
Accepted: 21 June 2010
We report the discovery of WASP-8b, a transiting planet of 2.25 ± 0.08 MJup on a strongly inclined eccentric 8.15-day orbit, moving in a retrograde direction to the rotation of its late-G host star. Evidence is found that the star is in a multiple stellar system with two other companions. The dynamical complexity of the system indicates that it may have experienced secular interactions such as the Kozai mechanism or a formation that differs from the “classical” disc-migration theory.
Key words: stars: individual: WASP-8 / techniques: photometric / techniques: spectroscopic / planet-star interactions / planetary systems / techniques: radial velocities
Based on observations made with HARPS spectrograph on the 3.6-m ESO telescope and the EULER Swiss telescope at La Silla Observatory, Chile.
Radial velocity data are only available in electronic form at the CDS via anonymous ftp to cdsarc.u-strasbg.fr (188.8.131.52) or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/517/L1
© ESO, 2010