2014年4月
ON THE VIABILITY OF THE MAGNETOROTATIONAL INSTABILITY IN CIRCUMPLANETARY DISKS
ASTROPHYSICAL JOURNAL
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- ,
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- 巻
- 785
- 号
- 2
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.1088/0004-637X/785/2/101
- 出版者・発行元
- IOP PUBLISHING LTD
We examine whether the magnetorotational instability (MRI) can serve as a mechanism of angular momentum transport in circumplanetary disks. For the MRI to operate the ionization degree must be sufficiently high and the magnetic pressure must be sufficiently lower than the gas pressure. We calculate the spatial distribution of the ionization degree and search for the MRI-active region where the two criteria are met. We find that there can be thin active layers at the disk surface depending on the model parameters, however, we find hardly any region which can sustain well-developed MRI turbulence; when the magnetic field is enhanced by MRI turbulence at the disk surface layer, a magnetically dominated atmosphere encroaches on a lower altitude and a region of well-developed MRI turbulence becomes smaller. We conclude that if there are no angular momentum transfer mechanisms other than MRI in gravitationally stable circumplanetary disks, gas is likely to pile up until disks become gravitationally unstable, and massive disks may survive for a long time.
Web of Science ® 被引用回数 : 47
Web of Science ® の 関連論文(Related Records®)ビュー
- リンク情報
- ID情報
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- DOI : 10.1088/0004-637X/785/2/101
- ISSN : 0004-637X
- eISSN : 1538-4357
- ORCIDのPut Code : 19830062
- Web of Science ID : WOS:000335736800020
- ORCIDで取得されたその他外部ID : a:1:{i:0;a:1:{s:8:"other-id";s:19:"WOS:000335736800020";}}