MISC

2010年8月

PRE-TRANSITIONAL DISK NATURE OF THE AB Aur DISK

ASTROPHYSICAL JOURNAL LETTERS
  • 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
  • 全て表示

718
2
開始ページ
L199
終了ページ
L203
記述言語
英語
掲載種別
DOI
10.1088/2041-8205/718/2/L199
出版者・発行元
IOP PUBLISHING LTD

The disk around AB Aur was imaged and resolved at 24.6 mu 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 mu m than at shorter wavelengths. In order to interpret the extended 24.6 mu m image, we consider a disk with a reduced surface density within a boundary radius R(c), 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 f(c) for the inner disk, we determine that the best match with the observed radial intensity profile at 24.6 mu m is achieved with R(c) = 88 AU and f(c) = 0.01. We suggest that the extended emission at 24.6 mu 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 R(c). 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.

リンク情報
DOI
https://doi.org/10.1088/2041-8205/718/2/L199
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000280710700032&DestApp=WOS_CPL
ID情報
  • DOI : 10.1088/2041-8205/718/2/L199
  • ISSN : 2041-8205
  • Web of Science ID : WOS:000280710700032

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