scholarly journals Detection of Submillimeter-wave [C i] Emission in Gaseous Debris Disks of 49 Ceti and β Pictoris

2017 ◽  
Vol 839 (1) ◽  
pp. L14 ◽  
Author(s):  
Aya E. Higuchi ◽  
Aki Sato ◽  
Takashi Tsukagoshi ◽  
Nami Sakai ◽  
Kazunari Iwasaki ◽  
...  
Keyword(s):  
Submillimeter Wave ◽  
Debris Disks

Detection of submillimeter-wave [C I]emission in gaseous debris disks of 49 Ceti and β Pictoris

2017 ◽  
Vol 13 (S332) ◽  
pp. 81-87
Author(s):  
Aya E. Higuchi ◽  
Aki Sato ◽  
Takashi Tsukagoshi ◽  
Nami Sakai ◽  
Kazunari Iwasaki ◽  
...  
Keyword(s):  
Molecular Clouds ◽  
Column Density ◽  
Density Ratio ◽  
Submillimeter Wave ◽  
Debris Disks ◽  
Excitation Temperature ◽  
Dust Grains ◽  
Line Profiles ◽  
Order Of Magnitude ◽  
Diffuse Clouds

AbstractWe have detected [C I] 3P1–3P0 emissions in the gaseous debris disks of 49 Ceti and β 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) × 1017 and (2.5 ± 0.7) × 1016 cm−2 for 49 Ceti and β Pictoris, respectively. The C/CO column density ratio is thus derived to be 54 ± 19 and 69 ± 42 for 49 Ceti and β 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 H2 molecules needed to reproduce CO molecules efficiently from C. This result implies a small number of H2 molecules in the gas disk; i.e., there is an appreciable contribution of secondary gas from dust grains.

Overview of the Superconducting Submillimeter-Wave Limb-Emission Sounder (SMILES) and Sensitivity to Chlorine Monoxide, ClO

2012 ◽  
Vol 132 (8) ◽  
pp. 609-615 ◽  
Author(s):  
Makoto Suzuki ◽  
Chihiro Mitsuda ◽  
Kenichi Kikuchi ◽  
Toshiyuki Nishibori ◽  
Satoshi Ochiai ◽  
...  
Keyword(s):  
Submillimeter Wave ◽  
Chlorine Monoxide

Millimeter- and Submillimeter-Wave Band Receiver on Hot Electrons

2009 ◽  
Vol 68 (6) ◽  
pp. 549-554
Author(s):  
Yu. Ye. Kamenev ◽  
F. F. Sizov ◽  
V. N. Dobrovolsky
Keyword(s):  
Submillimeter Wave ◽  
Hot Electrons ◽  
Wave Band
Sign in / Sign up

Export Citation Format

Share Document