Magnetorotational Instability in Protoplanetary Disks. II. Ionization State and Unstable Regions

摘要: We investigate where magnetorotational instability operates in protoplanetary disks, which can cause angular momentum transport the disks. spatial distribution of various charged particles and unstable regions for a variety models taking into account recombination ions electrons at grain surfaces, is an important process most parts find that all there inner region magnetorotationally stable due to ohmic dissipation. This must make accretion onto central star nonsteady. For model minimum-mass solar nebula, critical radius, inside disk stable, about 20 AU, mass rate just outside radius 10-7-10-6 M☉ yr-1. The smaller lower column density. Dust grains disks may grow by mutual sticking sediment toward midplane shrinks as size increases or sedimentation proceeds. Therefore, late evolutionary stages, be even regions.