WASP-8b: a retrograde transiting planet in a multiple system

D. Queloz, D.~R. Anderson, A. Collier Cameron, M. Gillon, L. Hebb, C. Hellier, P. Maxted, F. Pepe, D. Pollacco, D. Ségransan, B. Smalley, A.~H.~M.~J. Triaud, S. Udry, R. West

Research output: Contribution to journalArticlepeer-review

96 Citations (Scopus)


We report the discovery of WASP-8b, a transiting planet of 2.25 plusmn 0.08 M$_Jup$ 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 ldquoclassicalrdquo disc-migration theory. 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 ( or via http://cdsweb.u-strasbg.fr/cgi-bin/qcat?J/A+A/517/L1
Original languageEnglish
Pages (from-to)L1
JournalAstronomy and Astrophysics
Publication statusPublished - 1 Jul 2010


  • stars: individual: WASP-8, techniques: photometric, techniques: spectroscopic, planet-star interactions, planetary systems, techniques: radial velocities


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