Spherical Accretion

Details Spherical Accretion Spherical Accretion

2006-03-12

arxiv.org/abs/astro-ph/0603293v1

Astrophys.J.642:L65-L68,2006

Astronomy and Astrophysics

Astrophysics

ApJ Letters, 3 pages

Scientific paper

10.1086/504152

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 semi-collisional 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 semi-collisional regime.

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