Can photo-evaporation trigger planetesimal formation?

Details Can photo-evaporation trigger planetesimal formation? Can photo-evaporation trigger planetesimal formation?

2004-11-23

arxiv.org/abs/astro-ph/0411647v2

Astrophys.J. 623 (2005) L149-L152

Astronomy and Astrophysics

Astrophysics

4 pages, 1 figure. Revised and accepted by ApJL

Scientific paper

10.1086/430272

We propose that UV radiation can stimulate the formation of planetesimals in externally-illuminated protoplanetary disks. We present a numerical model of disk evolution including vertical sedimentation and photo-evaporation by an external O or B star. As solid material grows and settles toward the disk midplane, the outer layers of the disk become dust depleted. When such a disk is exposed to UV radiation, heating drives photo-evaporative mass-loss from its surface, generating a dust-depleted outflow. The dust:gas surface density ratio in the disk interior grows until dust in the disk midplane becomes gravitationally unstable. Thus, UV radiation fields may induce the rapid formation of planetesimals in disks where sedimentation has occurred.

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