WASP-8b: a retrograde transiting planet in a multiple system
Didier Queloz, David Anderson, Andrew Collier Cameron and, Micha\"el Gillon, Leslie Hebb, Coel Hellier, Pierre Maxted and, Francesco Pepe, Don Pollacco, Damien S\'egransan, Barry Smalley and, Amaury H.M.J Triaud, St\'ephane Udry, Richard West
TL;DR
This paper reports the discovery of WASP-8b, a retrograde transiting exoplanet in a complex multiple star system, highlighting its unusual orbital characteristics and potential dynamical interactions.
Contribution
It presents the first detailed characterization of a retrograde exoplanet in a multiple stellar system with evidence of complex dynamical history.
Findings
WASP-8b has a 2.25 Jupiter mass and an 8.15-day eccentric orbit.
The host star is part of a multiple stellar system.
The system's dynamics suggest secular interactions like the Kozai mechanism.
Abstract
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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