Spin-orbit misalignement for the transiting planet HD 80606b

Astronomy and Astrophysics – Astrophysics – Earth and Planetary Astrophysics

Scientific paper

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5 pages, 1 figure. Submitted to MNRAS

Scientific paper

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 (R_p = 1.04 +0.05-0.09 R_Jup), 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 (Beta = -59 +18-28 deg), providing a compelling evidence that HD 80606b owes its peculiar orbit to the Kozai migration mechanism.

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