論文

査読有り
2017年4月

Detection of Submillimeter-wave [CI] Emission in Gaseous Debris Disks of 49 Ceti and beta Pictoris

ASTROPHYSICAL JOURNAL LETTERS
  • Aya E. Higuchi
  • ,
  • Aki Sato
  • ,
  • Takashi Tsukagoshi
  • ,
  • Nami Sakai
  • ,
  • Kazunari Iwasaki
  • ,
  • Munetake Momose
  • ,
  • Hiroshi Kobayashi
  • ,
  • Daisuke Ishihara
  • ,
  • Sakae Watanabe
  • ,
  • Hidehiro Kaneda
  • ,
  • Satoshi Yamamoto

839
1
開始ページ
14
終了ページ
19
記述言語
英語
掲載種別
研究論文(学術雑誌)
DOI
10.3847/2041-8213/aa67f4
出版者・発行元
IOP PUBLISHING LTD

We have detected [C I] P-3(1)-P-3(0) emissions in the gaseous debris disks of 49 Ceti and beta Pictoris with the 10 m telescope of the Atacama Submillimeter Telescope Experiment, which is the first detection of such emissions. The line profiles of [C I] are found to resemble those of CO(J = 3-2) observed with the same telescope and the Atacama Large Millimeter/submillimeter Array. This result suggests that atomic carbon (C) coexists with CO in the debris disks. and is likely formed by the photodissociation of CO. Assuming an optically thin [C I] emission with the excitation temperature ranging from 30 to 100. K, the column density of C is evaluated to be (2.2 +/- 0.2). x. 10(17) and (2.5 +/- 0.7). x. 10(16). cm(-2) for 49 Ceti and beta Pictoris, respectively. The C/CO column density ratio is thus derived to be 54 +/- 19 and 69 +/- 42 for 49 Ceti and beta Pictoris, respectively. These ratios are higher than those of molecular clouds and diffuse clouds by an order of magnitude. The unusually high ratios of C to CO are likely attributed to a lack of H-2 molecules needed to reproduce CO molecules efficiently from C. This result implies a small number of H-2 molecules in the gas disk,. i.e., there is an appreciable contribution of secondary gas from dust grains.

Web of Science ® 被引用回数 : 12

リンク情報
DOI
https://doi.org/10.3847/2041-8213/aa67f4
arXiv
http://arxiv.org/abs/arXiv:1703.06661
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000399410200001&DestApp=WOS_CPL
URL
http://arxiv.org/abs/1703.06661v1