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Physical Processes Responsible for the Removal of Circumstellar Disks

Published online by Cambridge University Press:  25 May 2016

Doug Johnstone
Doug Johnstone*
Affiliation:
Dept. of Astronomy, University of Toronto, Ontario, Canada

Abstract

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The most likely processes responsible for the removal of circumstellar disks around young stars are reviewed with emphasis on the physical state of the disk during the period of destruction and the timescale for disk removal. Four disk dispersal mechanisms are discussed in detail: 1) viscous accretion of material onto the central source, 2) close stellar encounters, 3) stellar winds, and 4) photoevaporation by ultraviolet radiation. While viscous accretion is shown to be efficient in the inner regions of disks (r < 10 AU), photoevaporation is the principal process of disk dispersal at large radii (r > 10 AU). The commonly held view that stellar winds removed the remnant Solar Nebula is seriously questioned.

Type
Part 7. Circumstellar Disks
Information
Symposium - International Astronomical Union , Volume 197: Astrochemistry: From Molecular Clouds to Planetary Systems , 2000 , pp. 403 - 413
Copyright
Copyright © Astronomical Society of the Pacific 2000 

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