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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, Naoyuki Tamura)
by email : sseminar_at_subaru.naoj.org (please change"_at" to @).
June 03, Thursday, at 11:00 am
" Mid-infrared Observations of Warm Debris Disks "
Hideaki Fujiwara
(ISAS/JAXA)
After the IRAS observations, main-sequence stars that have circumstellar debris disks and thus show
infrared excess have been discovered. Since debris disks are thought to be the final stage of planet
formation, it is very important to investigate property and evolution of debris disks statistically.
However, little is known about the properties of the warm (Tdust > 150 K) debris disk material
located close to stars, which is likely to have a more direct link to the formation of terrestrial
planets than the low temperature debris dust which has been detected to date. Mid-infrared (MIR)
observations become a key method for planet formation study since MIR excess traces the thermal
emission from debris dust in inner planet forming region. We are carrying on an survey of warm
debris disks that show MIR excess by using the AKARI/IRC MIR All-Sky Survey data. So far, we have
identified several new debris disk candidates that show large 18 micron excess. In this
presentation, we will show the recent results of the debris disk survey with the AKARI/IRC MIR
All-Sky Survey data. We will also show the results of follow-up spectroscopic observations of
AKARI-discovered debris disks, which provide mineralogical information on debris dust.