Spin-orbit misalignement for the transiting planet HD 80606b

A global Markov Chain Monte Carlo analysis of published eclipse photometry and radial velocities is presented for the transiting planet HD 80606b. Despite the lack of a complete transit light curve, the size of the planet is measured with a good level of precision (Rp = 1.04 +0.05 −0.09 RJup), while the orbital parameters are refined. This global analysis reveals that the orbital axis of the planet is significatively inclined relative to the spin axis of the host star (β = −59 −28 deg), providing a compelling evidence that HD 80606b owes its peculiar orbit to the Kozai migration mechanism.