Pre-transitional disk nature of the AB Aur disk
M. Honda, A. K. Inoue, Y. K. Okamoto, H. Kataza, M. Fukagawa, T., Yamashita, T. Fujiyoshi, M. Tamura, J. Hashimoto, T. Miyata, S. Sako, I., Sakon, H. Fujiwara, T. Kamizuka, T. Onaka

TL;DR
This study resolves the AB Aur disk at 24.6 microns, revealing an extended structure indicative of a pre-transitional disk phase with a reduced inner disk and a thick outer disk.
Contribution
First imaging of AB Aur disk at 24.6 microns showing extended emission consistent with a pre-transitional disk structure.
Findings
Disk extends further at 24.6 microns than shorter wavelengths
Inner disk has reduced surface density within ~88 AU
Outer disk exhibits a wall-like structure at the boundary radius
Abstract
The disk around AB Aur was imaged and resolved at 24.6\,m using the Cooled Mid-Infrared Camera and Spectrometer on the 8.2m 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 , 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 for the inner disk, we determine that the best match with the observed radial intensity profile at 24.6\,m is achieved with =88 AU and =0.01. We suggest that the extended emission at 24.6\,m is due to the enhanced emission from a wall-like…
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Taxonomy
TopicsAstrophysics and Star Formation Studies · Astrophysical Phenomena and Observations · Astronomical Observations and Instrumentation
