Apr, 2017
Detection of Submillimeter-wave [CI] Emission in Gaseous Debris Disks of 49 Ceti and beta Pictoris
ASTROPHYSICAL JOURNAL LETTERS
- Volume
- 839
- Number
- 1
- First page
- 14
- Last page
- 19
- Language
- English
- Publishing type
- Research paper (scientific journal)
- DOI
- 10.3847/2041-8213/aa67f4
- Publisher
- 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.
- Link information
-
- 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
- ID information
-
- DOI : 10.3847/2041-8213/aa67f4
- ISSN : 2041-8205
- eISSN : 2041-8213
- ORCID - Put Code : 114357241
- arXiv ID : arXiv:1703.06661
- SCOPUS ID : 85052729284
- SCOPUS ID : 85018463198
- Web of Science ID : WOS:000399410200001