The Migration of Giant Planets

Details The Migration of Giant Planets The Migration of Giant Planets

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20917901e&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #179.01; Bulletin of the American Astronomical Society,

Astronomy and Astrophysics

Astronomy

Scientific paper

Giant planets are thought to open gaps in their nascent discs, and then undergo Type II migration. According to Type II theory, the migration rate should be determined only by the disc viscosity. We have performed a systematic test of this prediction, and found it to be false. Our observed migration rates varied with the disc surface density as well as the viscosity. This implies that Type II migration theory is not sufficient to explain giant planet migration. The reason for the discrepancy is almost certainly the gas which remains in the gap. The deviation from Type II behaviour has profound implications for the formation of the `hot Jupiters.'

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