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Compositions and origins of outer planet systems: insights from the Roche critical density

Authors
Type
Published Article
Journal
The Astrophysical Journal Letters
Publication Date
Feb 21, 2013
Volume
765
Issue
2
Pages
28–28
Source
SETI Institute
License
Unknown

Abstract

We consider the Roche critical density (ρ Roche), the minimum density of an orbiting object that, at a given distance from its planet, is able to hold itself together by self- gravity. It is directly related to the more familiar" Roche limit," the distance from a planet at which a strengthless orbiting object of given density is pulled apart by tides. The presence of a substantial ring requires that transient clumps have an internal density less than ρ Roche. Conversely, in the presence of abundant material for accretion, an orbiting object with ...

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