期刊
ASTROPHYSICAL JOURNAL LETTERS
卷 691, 期 1, 页码 L49-L54出版社
IOP PUBLISHING LTD
DOI: 10.1088/0004-637X/691/1/L49
关键词
accretion, accretion disks; MHD; planetary systems: protoplanetary disks; stars: winds, outflows; turbulence; waves
资金
- MEXT of Japan [19015004, 20740100, 15740118, 16077202, 18540238]
- Inamori Foundation
- CfCA
- Grants-in-Aid for Scientific Research [16077202, 20740100, 19015004, 15740118, 18540238] Funding Source: KAKEN
By performing local three-dimensional MHD simulations of stratified accretion disks, we investigate disk winds driven by MHD turbulence. Initially weak vertical magnetic fields are effectively amplified by magnetorotational instability and winding due to differential rotation. Large-scale channel flows develop most effectively at 1.5-2 times the scale heights where the magnetic pressure is comparable to but slightly smaller than the gas pressure. The breakup of these channel flows drives structured disk winds by transporting the Poynting flux to the gas. These features are universally observed in the simulations of various initial fields. This disk wind process should play an essential role in the dynamical evaporation of protoplanetary disks. The breakup of channel flows also excites the momentum fluxes associated with Alfvenic and (magneto-)sonic waves toward the midplane, which possibly contribute to the sedimentation of small dust grains in protoplanetary disks.
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