Astronomy and Astrophysics – Astronomy
Scientific paper
Dec 2005
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2005aas...207.7417b&link_type=abstract
American Astronomical Society Meeting 207, #74.17; Bulletin of the American Astronomical Society, Vol. 37, p.1287
Astronomy and Astrophysics
Astronomy
5
Scientific paper
The preferential coupling of a magnetic field to ionized material implies a two-layered structure in protoplanetary accretion disks due to partial activation of the magnetorotational instability. This structure provides a disk instability that is capable of explaining the large fluctuations of brightness in FU Orionis objects, which are often thought to originate in a sudden increase of protostellar disk accretion. In the current work, we determine the importance of the active layer in these phenomena by analyzing the ability of an averaged one-layer model to reproduce outbursts with appropriate timescales and magnitudes. W use the results to determine constraints on protoplanetary disk structure.
Book Laura G.
Hartmann Lee
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