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SUMMARY:Outer Solar System formation and evolution - Morbidelli\, A (Obser
 vatoire de Nice)
DTSTART:20091109T140000Z
DTEND:20091109T145000Z
UID:TALK21397@talks.cam.ac.uk
CONTACT:Mustapha Amrani
DESCRIPTION:I will discuss how the giant planets of our solar system could
  avoid Type II migration towards the Sun. The dynamics\, ruled by the inte
 raction of Jupiter and Saturn with the gas disk would have left the four g
 iant planets on fully resonant orbits with very small eccentricities and i
 nclinations. After the disappearance of the gas disk\, the interaction of 
 the planets with the planetesimals extracted the former from their origina
 l quadruple resonance and led to a late but short phase of dynamical insta
 bility in the planetary motion. The current orbital configuration of the g
 iant planets could then be achieved from the gravitational interaction bet
 ween the planets and the disk of planetesimals. In particular\, we will di
 scuss how the amplitudes of the secular modes that characterize the curren
 t secular motion of the planets could be achieved. In the scenario where t
 he dynamical instability of the giant planets occurred late\, which is tem
 pting to explain the origin of the so-called Late Heavy Bombardment\, the 
 orbital stability of the terrestrial planets is at risk. I will discuss ho
 w the terrestrial planets could have survived the sweeping of powerful sec
 ular resonances through their region and eventually acquire their current 
 orbits. Constraints from the orbital distribution in the asteroid belt wil
 l also be discussed\, as well as the origin of the orbital architecture of
  the Kuiper belt and of the systems of irregualr satellites.
LOCATION:Satellite
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