Disk dispersal and photoevaporation

Uma Gorti*
1NASA Ames Research Center, Mo ett Field, CA, USA
2SETI Institute, Mountain View, CA, USA

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This article discusses protostellar disk dispersal due to photoevaporation by ultraviolet and X-ray photons from the central star. The current theoretical understanding of disk dispersal is summarised and observational constraints are discussed. Disk lifetimes due to photoevaporation are typically ~ a few million years and depend on stellar mass, radiation field, disk viscosity, and dust evolution.

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Keywords : stars: formation – protoplanetary disks; accretion: accretion disks