Spin-orbit misalignement for the transiting planet HD 80606b

2) ((1) Liege University; (2) Geneva Observatory; Belgium; M. Gillon (1; Switzerland)

arxiv: 0906.4904 · v1 · submitted 2009-06-26 · 🌌 astro-ph.EP

Spin-orbit misalignement for the transiting planet HD 80606b

M. Gillon (1 , 2) ((1) Liege University , Belgium , (2) Geneva Observatory , Switzerland) This is my paper

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keywords planetanalysisaxisglobalorbitaltransitingbetacarlo

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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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A tidally detached super Neptune on a strongly misaligned retrograde orbit
astro-ph.EP 2026-04 unverdicted novelty 5.0

TOI-1710 b has a true obliquity of 149 degrees indicating retrograde motion, favoring high-eccentricity migration via planet-planet scattering and Kozai-Lidov cycles for this tidally detached super-Neptune.