Halting Planet Migration in the Evacuated Centers of Protoplanetary Disks
نویسنده
چکیده
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, R0, where small grains in a protoplanetary disk reach sublimation temperature (∼ 1500 K) corresponds to a period of∼ 6 days. Interior to R0, 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. Subject headings: astrobiology — circumstellar matter — planetary systems: formation — planetary systems: protoplanetary disks — stars: formation
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