論文

査読有り 筆頭著者 責任著者
2011年12月

A FAST AND ACCURATE CALCULATION SCHEME FOR IONIZATION DEGREES IN PROTOPLANETARY AND CIRCUMPLANETARY DISKS WITH CHARGED DUST GRAINS

ASTROPHYSICAL JOURNAL
  • Yuri I. Fujii
  • ,
  • Satoshi Okuzumi
  • ,
  • Shu-ichiro Inutsuka

743
1
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.1088/0004-637X/743/1/53
出版者・発行元
IOP PUBLISHING LTD

We develop a fast and accurate calculation method for ionization degrees in protoplanetary and circumplanetary disks including dust grains. We apply our method to calculate the ionization degree of circumplanetary disks. It is important to understand the structure and evolution of protoplanetary /circumplanetary disks since they are thought to be the sites of planet/satellite formation. The turbulence that causes gas accretion is supposed to be driven by magnetorotational instability (MRI) that occurs only when the ionization degree is high enough for magnetic field to be coupled to gas. We calculate the ionization degrees in circumplanetary disks to estimate the sizes of MRI-inactive regions. We properly include the effect of dust grains because they efficiently capture charged particles and make ionization degree lower. Inclusion of dust grains complicates the reaction equations and requires expensive computation. In order to accelerate the calculation of ionization reactions, we develop a semianalytic method based on the charge distribution model proposed previously. This method enables us to study the ionization state of disks for a wide range of model parameters. For a previous model of circum-Jovian disk, we find that an MRI-inactive region covers almost all regions even without dust grains. This suggests that the gas accretion rates in circumplanetary disks are much smaller than previously thought.

Web of Science ® 被引用回数 : 37

リンク情報
DOI
https://doi.org/10.1088/0004-637X/743/1/53
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000297408300053&DestApp=WOS_CPL
URL
http://orcid.org/0000-0002-3648-0507
ID情報
  • DOI : 10.1088/0004-637X/743/1/53
  • ISSN : 0004-637X
  • ORCIDのPut Code : 19830063
  • Web of Science ID : WOS:000297408300053
  • 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:000297408300053";}}

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