Subaru Seminars



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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 (Tomonori Usuda, Kumiko S. Usuda, Masahiko Hayashi, Masayuki Akiyama) by email.

December 10, Friday at 11:00am

" Dust Settlement in Orion Proplyds"

Takuya Yamashita (Subaru Telescope, NAOJ)

We have made mid-infrared and H2 emission surveys of Orion proplyds in order to study behavior of gaseous and solid components within their circumstellar disks using COMICS and IRCS on Subaru. We found an clear anti correlation between the MIR flux density and the H2 emission, i.e. proplyds strong in H2 mission had weak MIR emission. This anti correlation is naturally understood as an evolutional sequence of evaporation for proplyds in which gaseous and solid components are separated along the z direction within the circumstellar disk. We argue that the separation is likely to be caused by settlement of dust grains onto the disk equator.

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

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