The effect of poloidal magnetic field on type I planetary migration

Details The effect of poloidal magnetic field on type I planetary migration The effect of poloidal magnetic field on type I planetary migration

May 2008

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2008iaus..249..401m&link_type=abstract

Exoplanets: Detection, Formation and Dynamics, Proceedings of the International Astronomical Union, IAU Symposium, Volume 249, p

Astronomy and Astrophysics

Astronomy

1

Mhd, Planets And Satellites: Formation, Solar System: Formation

Scientific paper

We study the effect of poloidal magnetic field on type I planetary migration by linear perturbation analysis with the shearing-sheet approximation and the analytic results are compared with numerical calculation. We investigate the cases where magneto-rotational instability (MRI) does not occur: either the disk is two-dimensional, or a very strong field is exerted. We derive formulae for torque exerted on the planet for both cases. We find that two-dimensional torque is suppressed when plasma beta is less than 1 and three-dimensional modes dominate, in contrast to unmagnetized case.

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