Takafumi Kamizuka

Pre-transitional Disk Nature of the AB Aur Disk

The disk around AB Aur was imaged and resolved at 24.6??m using the Cooled Mid-infrared Camera and Spectrometer on the 8.2 m Subaru Telescope. The Gaussian full width at half-maximum of the source size is estimated to be 90 ? 6?AU, indicating that the disk extends further out at 24.6??m than at shorter wavelengths. In order to interpret the extended 24.6??m image, we consider a disk with a reduced surface density within a boundary radius Rc , which is motivated by radio observations that suggest a reduced inner region within about 100?AU from the star. Introducing the surface density reduction factor fc for the inner disk, we determine that the best match with the observed radial intensity profile at 24.6??m is achieved with Rc = 88?AU and fc = 0.01. We suggest that the extended emission at 24.6??m is due to the enhanced emission from a wall-like structure at the boundary radius (the inner edge of the outer disk), which is caused by a jump in the surface density at Rc . Such a reduced inner disk and geometrically thick outer disk structure can also explain the more point-like nature at shorter wavelengths. We also note that this disk geometry is qualitatively similar to a pre-transitional disk, suggesting that the AB Aur disk is in a pre-transitional disk phase.

GROUND-BASED Paα NARROW-BAND IMAGING OF LOCAL LUMINOUS INFRARED GALAXIES. I. STAR FORMATION RATES AND SURFACE DENSITIES

Luminous infrared galaxies (LIRGs) are enshrouded by a large amount of dust, produced by their active star formation, and it is difficult to measure their activity in the optical wavelength. We have carried out Pa

Development of high-throughput silicon lens and grism with moth-eye antireflection structure for mid-infrared astronomy

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Development of a new calibration method for ground-based Paschen-alpha imaging data

narrow-band imaging observations of 38 nearby star-forming galaxies including 33 LIRGs listed in

miniTAO/ANIR Paα SURVEY OF LOCAL LIRGs

IRAS

Perfomance verification of the ground-based mid-infrared camera MAX38 on the MiniTAO Telescope

RBGS catalog with the Atacama Near InfraRed camera (ANIR) on the University of Tokyo Atacama Observatory (TAO) 1.0 m telescope (miniTAO). Star formation rates (SFRs) estimated from the Pa

Evaluations of new atmospheric windows at thirty micron wavelengths for astronomy

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Fabrication and tolerances of moth-eye structures for perfect antireflection in the mid-infrared wavelength region

fluxes, corrected for dust extinction using the Balmer Decrement Method (typically

Revised specifications and current development status of MIMIZUKU: the mid-infrared instrument for the TAO 6.5-mtelescope

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