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

Didier Queloz , David Anderson , Andrew Collier Cameron , Micha\"el Gillon , Leslie Hebb , Coel Hellier , Pierre Maxted , Francesco Pepe

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Don Pollacco Damien S\'egransan Barry Smalley Amaury H.M.J Triaud St\'ephane Udry Richard West

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classification 🌌 astro-ph.EP

keywords systemmultipleplanetretrogradestartransitingclassicalcompanions

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We report the discovery of WASP-8, a transiting planet of 2.25+-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 ``classical" disc-migration theory.

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

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