Other
Scientific paper
Jan 2012
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2012aas...21931501l&link_type=abstract
American Astronomical Society, AAS Meeting #219, #315.01
Other
Scientific paper
I will discuss the role of magnetic fields in the collapse of dense cores to form stars and protoplanetary disks. I will highlight recent theoretical results that show how magnetic fields, with the magnitudes currently observed in molecular clouds, affect the evolution of these dense cores and protoplanetary disks. Decades ago Mestel and Spitzer pointed out that the magnetic flux must be dissipated at some point during the gravitational collapse of the cloud cores or the magnetic fields of young stars would be too large. It has been recognized recently that field freezing of magnetic fields also presents an obstacle to the formation of protoplanetary disks: magnetic braking by the strong field dragged during the collapse will prevent the formation of a centrifugally supported disk. Thus, non-ideal effects like Ohmic dissipation or ambipolar diffusion must set in at high densities o get rid of the excess magnetic flux in the star and prevent the catastrophic magnetic braking. Another important result is that realistic levels of disk magnetization left over during the protoplanetary disk formation will produce subkeplerian rotation of the gas. This effect makes it difficult to eject disk winds in cold accretion disks and affects planet migration. Finally, I will discuss the enhanced gravitational stability of magnetized accretion disks and its effect on planet formation.
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