Hot jupiters higher t star bigger misalignment 6250 k

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Unformatted text preview: Hot Jupiters: Higher T star → bigger misalignment, 6250 K change. Winn et al. 2010 Misalignment and Temperature Obliquity drops with system age (as T low enough for convective envelope) - tidally align with stellar spin axis Albrecht et al 2012 c Multi-planet systems Huber et al 2013 Theory When do planets migrate? → if HJ migrate via interaction with other planets and achieve high obliquity after the disk formed - any other planets would be coplanar → the disk itself becomes misaligned, and within its plane planets migrate via tidal friction, Kozai, scattering… Theory zoo 1) explain Kozai interaction (applies to both planet-planet, disk-planet ) 2) Kozai simulations for planet-planet 3) Inclined disks and warped disks 4) Kozai simulations for disk-planet 5) other planet-planet mechanisms: scattering and secular chaos Theory zoo 1) explain Kozai interaction (applies to both planet-planet, disk-planet ) 2) Kozai simulations for planet-planet 3) Inclined disks and warped disks 4) Kozai simulations for disk-planet 5) other planet-planet mechanisms: scattering and secular chaos Kozai oscillations → require the presence of a third, distant body, and some small initial misalignment → steady oscillations involving cyclical exchange of angular momentum to the third body → eccentricity and inclination undergo antiphase oscillations SIMULATION Kozai : limitations → we require that other perturbations are weaker, including general relativistic effects, quadrupolar bulges, tidal effects on the planet → Relative precession rates: have to be < 1 4 AU suppression radius (if a = 1000 AU) Kozai: predictions → star must have a binary companion with small binary mass-ratio → mutual inclination between 20 and 150 deg → angle between spin axis of primary star and present day planet orbit: 0 to 130 deg , 0 to 50 preferred → semimajor axis ratio with any second planet will be small so that precession due to that planet doesn’t break Kozai resonance → thus : Kozai more likely in single rather than multipleplanet systems Theory zoo 1) explain Kozai interaction (applies to both planet-planet, disk-planet ) 2) Kozai simulations for planet-planet 3) Inclined disks and warped disks 4) Kozai simulations for disk-planet 5) other planet-planet mechanisms: scattering and secular chaos Kozai with tidal drag Kozai evolution of HD80606b progenitor Fabrycky and Tremaine 2007 Kozai: inclination distribution Wu et al 2007 Theory zoo 1) explain...
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This document was uploaded on 04/05/2014.

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