Encyclopedia of Astrobiology

2015 Edition
| Editors: Muriel Gargaud, William M. Irvine, Ricardo Amils, Henderson James (Jim) CleavesII, Daniele L. Pinti, José Cernicharo Quintanilla, Daniel Rouan, Tilman Spohn, Stéphane Tirard, Michel Viso

Runaway Gas Accretion

  • Sean N. Raymond
Reference work entry
DOI: https://doi.org/10.1007/978-3-662-44185-5_1396

Definition

Runaway gas accretion is the accelerated accretion of gas from the  protoplanetary disk onto a growing  giant planet. The runaway gas accretion phase is thought to occur when the mass in a planetary core’s gaseous envelope is comparable to the core mass, and a large reservoir of gas remains in the disk. Runaway gas accretion is quenched when the planet carves an annular gap in the disk, having accreted all the gas within its direct gravitational influence, i.e., its  Hill sphere. Dynamical instabilities, for example, due to interactions with the gas disk, could however increase the planetary eccentricity and restore a large accretion rate of gas, for massive enough planets.

See Also

Copyright information

© Springer-Verlag Berlin Heidelberg 2015

Authors and Affiliations

  1. 1.Laboratoire d'Astrophysique de BordeauxCNRS, Universite de BordeauxBordeauxFrance