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THE ASTROPHYSICAL JOURNAL, 567:579586, 2002 March 1 ( 2002. The American Astronomical Society. All rights reserved. Printed in U.S.A.
 

Summary: THE ASTROPHYSICAL JOURNAL, 567:579╚586, 2002 March 1
( 2002. The American Astronomical Society. All rights reserved. Printed in U.S.A.
DAMPING OF TERRESTRIAL-PLANET ECCENTRICITIES BY DENSITY-WAVE INTERACTIONS
WITH A REMNANT GAS DISK
CRAIG B. AGNOR1,2 AND WILLIAM R. WARD2
Received 2001 August 6; accepted 2001 November 1
ABSTRACT
We examine the damping of terrestrial-planet eccentricities via density-wave interactions with a
remnant gas disk that postdated the accretionary epoch. A lower limit is estimated for the gas surface
density present in the terrestrial zone required for acoustic damping to be eective, and a simple model
for describing the disk¤s inĐuence on the planet eccentricities is presented. The results suggest that the
terrestrial-planet eccentricities could be reduced from values permitting crossing orbits to the present-day
values by a remnant disk with gas surface density of D10~3╚10~4 times the minimum-mass solar nebula
value and characteristic gas dissipation timescales of 106╚107 yr.
Subject headings: accretion, accretion disks ╚ celestial mechanics ╚ planetary systems ╚
solar system: formation
1. INTRODUCTION
The generally accepted model for terrestrial-planet for-
mation describes their hierarchical accumulation from
smaller rocky objects. This process is typically divided into

  

Source: Agnor, Craig B. - Astronomy Unit, School of Mathematical Sciences, Queen Mary, University of London

 

Collections: Physics