Statistics – Computation
Scientific paper
Sep 2011
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2011ess.....2.3309f&link_type=abstract
American Astronomical Society, ESS meeting #2, #33.09
Statistics
Computation
Scientific paper
We calculate the ionization degree of circumplanetary disks including dust grains. It is important to understand the structure and evolution of circumplanetary disks since they are thought to be the sites of 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 so-called, “dead zones.” 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 of Okuzumi (2009). 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 a dead zone covers almost all inner regions even without dust grains. This suggests that the gas accretion rates in are much smaller than previously thought.
Fujii Yuri I.
Inutsuka Shu-ichiro
Okuzumi Satoshi
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