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Title:
Planet-Planet Scattering in Planetesimal Disks
Authors:
Raymond, Sean N.; Armitage, Philip J.; Gorelick, Noel
Affiliation:
AA(Center for Astrophysics and Space Astronomy, 389 UCB, University of Colorado, Boulder, CO 80309, USA ; Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309, USA ; ), AB(Department of Astrophysical and Planetary Sciences, University of Colorado, Boulder, CO 80309, USA ; JILA, 440 UCB, University of Colorado, Boulder, CO 80309, USA ), AC(Google, Inc., 1600 Amphitheatre Parkway, Mountain View, CA 94043, USA)
Publication:
The Astrophysical Journal Letters, Volume 699, Issue 2, pp. L88-L92 (2009). (ApJL Homepage)
Publication Date:
07/2009
Origin:
IOP
ApJ Keywords:
celestial mechanics, planetary systems: formation, planetary systems: protoplanetary disks, solar system: formation
DOI:
10.1088/0004-637X/699/2/L88
Bibliographic Code:
2009ApJ...699L..88R

Abstract

We study the final architecture of planetary systems that evolve under the combined effects of planet-planet and planetesimal scattering. Using N-body simulations we investigate the dynamics of marginally unstable systems of gas and ice giants both in isolation and when the planets form interior to a planetesimal belt. The unstable isolated systems evolve under planet-planet scattering to yield an eccentricity distribution that matches that observed for extrasolar planets. When planetesimals are included the outcome depends upon the total mass of the planets. For M tot gsim 1 MJ the final eccentricity distribution remains broad, whereas for M tot lsim 1 MJ a combination of divergent orbital evolution and recircularization of scattered planets results in a preponderance of nearly circular final orbits. We also study the fate of marginally stable multiple planet systems in the presence of planetesimal disks, and find that for high planet masses the majority of such systems evolve into resonance. A significant fraction leads to resonant chains that are planetary analogs of Jupiter's Galilean satellites. We predict that a transition from eccentric to near-circular orbits will be observed once extrasolar planet surveys detect sub-Jovian mass planets at orbital radii of a sime 5-10 AU.
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