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The Subaru Seminar is usually held in Room 104 of the Hilo Base Facility, adjacent to the main lobby. Everyone is welcome to attend. If you are interested in giving a seminar, please contact Subaru seminar organizers (Tae-Soo Pyo, Sherry Yeh, Nagayoshi Ohashi) by email : (please change"_at" to @).

December 13, Friday, at 11:00 am, Rm 104A

" Formation and Structure of Circum-Planetary Disks "

Takayuki Tanigawa

(Hokkaido University)

We investigate formation and structure of circumplanetary disks in order to understand formation processes of satellite formation around giant planets. We first examine structure of gas accretion from protoplanetary disks onto circumplanetary disks by using hydrodynamic simulation with nested grid method, which significantly enhances spacial resolution near the planet. Our detailed analysis of the gas accretion flow reveals the structure of the circumplanetary disks in detail and one of the most interesting features is that most of gas accretion onto circumplanetary disks occurs nearly vertically toward the disk surface from high altitude, not through the midplane. We also carry out orbital integration of particles rotating around the sun in order to understand how solid materials, which are necessary components of the satellites, rotating around the sun accrete onto circumplanetary disks under the influence of the gas accretion. We find that the accretion efficiency of the solid particles peaks around 10m-sized particles because energy dissipation of drag with circum-planetary disk gas in this size regime is most effective. We discuss the formation processes of Galilean satellites and find that solid to gas ratio in the solar nebula near the proto-Jovian orbit should be very high (~1) in order to explain the current features of the satellites.

Seminars are also held at JAC, CFHT, and IfA.

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