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Issue A&A
Volume 375, Number 2, August IV 2001
Page(s) L31 - L34
Section Letters
DOI http://dx.doi.org/10.1051/0004-6361:20010917



A&A 375, L31-L34 (2001)
DOI: 10.1051/0004-6361:20010917

Long-term collisional evolution of a dissipative particle disc perturbed by a giant-planet embryo

S. Charnoz and A. Brahic

Université Paris 7 Denis Diderot, Service d'Astrophysique & CEA Saclay, France

(Received 17 April 2001 / Accepted 27 June 2001)

Abstract
Recent works have shown that in a disc of planetesimals perturbed by a proto-Jupiter, the coupling between embryo's perturbations and inelastic collisions heats up the disc over several astronomical units in a few 105 years. Using a simulation of a disc made of hard-spheres suffering inelastic collisions, we performed long-term numerical integrations to determine if the energy dissipated in collisions may finally damp eccentricities and inclinations induced by the proto-Jupiter. It is shown that the coupling between mean-motion resonances and collisions induces different damping regimes as a function of the protoplanet's mass. A 15 $M_{\oplus} $ proto-Jupiter is more efficient than a 300 $M_{\oplus} $ one to stir the disc over longer timescales, due to the non-emptying of isolated first order mean-motion resonances.


Key words: solar system formation -- planetesimals -- giant-planet formation -- Asteroid Belt -- collisions

Offprint request: S. Charnoz, charnoz@discovery.saclay.cea.fr




© ESO 2001


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