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Spherical accretion

Sari, Re'em and Goldreich, Peter (2006) Spherical accretion. Astrophysical Journal, 642 (1). L65-L67. ISSN 0004-637X. http://resolver.caltech.edu/CaltechAUTHORS:SARapj06

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Abstract

We compare different examples of spherical accretion onto a gravitating mass. Limiting cases include the accretion of a collisionally dominated fluid and the accretion of collisionless particles. We derive expressions for the accretion rate and density profile for semicollisional accretion, which bridges the gap between these limiting cases. Particle crossing of the Hill sphere during the formation of the outer planets is likely to have taken place in the semicollisional regime.


Item Type:Article
Additional Information:© 2006 The American Astronomical Society. Received 2006 January 31; accepted 2006 March 13; published 2006 April 10. We thank S. Shapiro for a helpful discussion. R.S. is an Alfred P. Sloan Fellow and a Packard Fellow. This research was supported in part by NASA grant NAG 5-12037.
Group:TAPIR
Subject Keywords:accretion, accretion disks—planets and satellites: formation
Issue or Number:1
Record Number:CaltechAUTHORS:SARapj06
Persistent URL:http://resolver.caltech.edu/CaltechAUTHORS:SARapj06
Alternative URL:http://www.journals.uchicago.edu/ApJ/journal/issues/ApJL/v642n1/20391/brief/20391.abstract.html
Usage Policy:No commercial reproduction, distribution, display or performance rights in this work are provided.
ID Code:7228
Collection:CaltechAUTHORS
Deposited By: Lindsay Cleary
Deposited On:23 Jan 2007
Last Modified:28 Feb 2013 17:13

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