Spherical accretion

Re'em Sari*, Peter Goldreich

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

6 Scopus citations


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.

Original languageAmerican English
Pages (from-to)L65-L67
JournalAstrophysical Journal
Issue number1 II
StatePublished - 1 May 2006
Externally publishedYes

Bibliographical note

Funding Information:
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


  • Accretion, accretion disks
  • Planets and satellites: formation


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