The magnetization of protoplanetary discs

Details The magnetization of protoplanetary discs The magnetization of protoplanetary discs

Feb 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003mnras.339..455b&link_type=abstract

Monthly Notice of the Royal Astronomical Society, Volume 339, Issue 2, pp. 455-459.

Astronomy and Astrophysics

Astronomy

4

Accretion, Accretion Discs, Magnetic Fields, Circumstellar Matter, Planetary Systems: Protoplanetary Discs

Scientific paper

The remanent magnetization of meteorite material in the Solar system indicates that magnetic fields of several gauss are present in the protoplanetary disc. It is shown that such relatively strong magnetic fields can be generated in dusty protoplanetary discs by relative shear motions of the charged dust and the neutral gas components. Self-consistent multi-fluid simulations show that, for typical plasma parameters, shear flows with collisional momentum transfer between the different components of the dusty plasma result in a very efficient generation of magnetic fields with strengths of about 0.1-1 G on spatial scales of two astronomical units in about one year. Based on the simulations we may predict that future measurements will reveal the strong magnetization of circumstellar discs around young stellar objects.

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