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Planetesimal Formation by Gravitational Instability—The Goldreich-Ward Hypothesis Revisited

Published online by Cambridge University Press:  26 May 2016

Andrew N. Youdin  and
Frank H. Shu
Andrew N. Youdin
Affiliation:
Astronomy Dept., University of California, Berkeley, CA 94720, USA
Frank H. Shu
Affiliation:
Astronomy Dept., University of California, Berkeley, CA 94720, USA

Abstract

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We consider the formation of planetesimals via gravitational instability. While minimum solar nebula (MSN) models are known to be gravitationally stable, we find that sufficiently metal enriched and/or colder discs can yield planetesimals by the Goldreich-Ward mechanism (GWM). This is because the shear between gas and solids, previously believed to render the GWM ineffective, can only stir a finite amount of solids.

Type
Part II: Progress in the theory of planet formation
Information
Symposium - International Astronomical Union , Volume 202: Planetary Systems in the Universe – Observation, Formation and Evolution , 2004 , pp. 250 - 252
Copyright
Copyright © Astronomical Society of the Pacific 2004 

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