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SUMMARY:Tides in the Atmospheres of Super-Earths - Pierre Auclair-Desrotou
 r (OBSPM - CEA)
DTSTART:20160425T150000Z
DTEND:20160425T160000Z
UID:TALK64952@talks.cam.ac.uk
CONTACT:Jean Teyssandier
DESCRIPTION:Tides can strongly affect the evolution of the spin of planets
 . Super-Earths presenting a solid core and an atmosphere are submitted to 
 both gravitational tides caused by bodies’ mutual gravitational interact
 ions and thermal tides resulting from stellar insolation. Thermal tides ar
 e particularly important for planets in the habitable zone where they driv
 e the tidal response of the atmosphere (Correia & Laskar 2008). They play 
 a key role for the equilibrium states of the spin\, as in the case of Venu
 s (Correia & Laskar 2004) and of telluric exoplanets (e.g. the numerical s
 imulations by Leconte & al. 2015). \nGiven the complex mechanisms involved
  in thermal tides\, analytic models are essential to understand the depend
 ence of the perturbation on the physics of the atmosphere and the tidal fr
 equency. The one proposed in the 60’s by Lindzen and Chapman explains we
 ll thermal tides in the asymptotic regime of fast rotators but presents a 
 singularity near synchronization. In this seminar\, we will present a new 
 analytic approach that generalizes these early works to all regimes of tid
 al perturbations. This model describes the mechanisms of tidal waves gener
 ated in the atmosphere by both gravitational and thermal tides. The tidal 
 torque is computed as a function of the frequency of the forcing and agree
 s well with results obtained by direct numerical simulations based on Gene
 ral Circulation Models. We then use it to revisit the early works predicti
 ng the equilibrium rotation of Venus-like planets.
LOCATION:MR14\,  Centre for Mathematical Sciences\, Wilberforce Road\, Cam
 bridge
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