Halting Planet Migration in the Evacuated Centers of Protoplanetary Disks

Details Halting Planet Migration in the Evacuated Centers of Protoplanetary Disks Halting Planet Migration in the Evacuated Centers of Protoplanetary Disks

2002-06-14

arxiv.org/abs/astro-ph/0206232v1

Astrophys.J. 574 (2002) L87-L90

Astronomy and Astrophysics

Astrophysics

9 pages, 1 figure, to appear in ApJ letters

Scientific paper

10.1086/342370

Precise Doppler searches for extrasolar planets find a surfeit of planets with orbital periods of 3-4 days, and no planets with orbital periods less than 3 days. The circumstellar distance, R_0, where small grains in a protoplanetary disk reach sublimation temperature (~1500 K) corresponds to a period of ~6 days. Interior to R_0, turbulent accretion due to magneto-rotational instability may evacuate the disk center. We suggest that planets with orbital periods of 3-4 days are so common because migrating planets halt once this evacuated region contains the sites of their exterior 2:1 Lindblad resonances.

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