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streaming instability

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4 - Planetesimal Formation
Philip J. Armitage, Stony Brook University, State University of New York
Book:

Astrophysics of Planet Formation

Published online:

27 January 2020

Print publication:

30 January 2020, pp 141-180
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Summary

Chapter 4 covers the evolution of the solid component of protoplanetary disks, from dust through to the formation of km-scale planetesimals. The physics of how dust particles interact with the gas through aerodynamic drag is described, together with the consequences - vertical settling, radial drift, particle trapping, and particle pile-up. The outcome of particle collisions, and their theoretical description using the coagulation equation, are reviewed. Collective mechanisms for planetesimal formation via gravitational collapse are discussed, starting with the classical Goldreich-Ward theory, and concluding with the streaming instability of aerodynamically coupled mixtures of gas and dust.