DPS 34th Meeting, October 2002
Session 27. Comet Nuclei
Oral, Chair(s): C. Lisse and Y.R. Fernandez, Thursday, October 10, 2002, 2:00-4:00pm, Ballroom

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[27.09] Formation of the Oort Cloud: Coupling Dynamical and Collisional Evolutions of Cometesimals

S. Charnoz (Equipe Gamma-Gravitation, Université Paris 7 & CEA Saclay), A. Morbidelli (Observatoire de la Côte d'Azur)

Cometesimals are thought to be born in the region of Giant Planets region and were subsequently ejected to the Oort Cloud by gravitational scattering. Some recent works (Stern & Weisman, 2001 Nature 409) have emphasized that during this phase of violent ejection, random velocities among cometesimals become so high that the majority of kilometer-sized comets might have been destroyed by multiple violent collisions before they reach the Oort Cloud, resulting in a low mass Oort Cloud. We present a new approach which allows to couple dynamical and collisional evolutions. This study focuses on cometesimals starting from the Jupiter-Saturn region. We find that the rapid depletion of the disk, due to the gravitational-scattering exerted by the giant planets, prevents a large fraction of cometesimals from rapid collisional destruction. These conclusions support the classical scenario of Oort Cloud formation.

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Bulletin of the American Astronomical Society, 34, #3< br> © 2002. The American Astronomical Soceity.