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Corotation torques and type I planetary migration

Paardekooper, S-J (Cambridge)
Wednesday 19 August 2009, 09:40-10:00

Meeting Room 2, CMS


In the standard picture of planet migration, Type I migration is due to a linear response of the disc to the presence of a low-mass planet. This mode of migration is driven by torques generated at Lindblad resonances, can be alarmingly fast, and takes all planets up to a few times the mass of the Earth very close to the central star. Corotation torques, in the linear picture generated at corotation resonances, were thought to play only a minor role. Recent work has shown, however, that this simple linear model is not correct. Corotation torques are always non-linear, and can be much larger than the linear estimate, to the extent that they can even dominate over the Lindblad torques, especially when non-barotropic effects are considered. I will give an overview of the current state of affairs concerning the new picture that is emerging for Type I migration, and how this may affect planet formation in general.


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