William R. Ward 1997 ApJ 482 L211 doi:10.1086/310701
William R. Ward1
Show affiliationsGravitational interactions (i.e., disk tides) between a newly formed protoplanet and its precursor disk give rise to a net torque that drains angular momentum from the protoplanet's orbit. As a result, protoplanetary objects suffer orbital decay as the disk attempts to destroy the very system it spawns. Survival of a planetary system may be a rather uncertain outcome, and the fraction of circumstellar disks that produce an extant system could be significantly less than unity. Newly discovered close stellar companions may be circumstantial evidence of such large-scale orbit migrations. A scheme for in situ accretion of such objects is outlined that is consonant with a strong tidal influence.
accretion, accretion disks; planetary systems; solar system: formation
Issue 2 (1997 June 20)
Received 1997 January 24, accepted for publication 1997 April 3
William R. Ward 1997 ApJ 482 L211
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