File:Higuchi 2019 ApJL 885 L39.pdf
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First Detection of Submillimeter-wave [13C i] 3 P 1–3 P 0 Emission in a Gaseous Debris Disk of 49 Ceti with ALMA
Summary
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English: We have detected the submillimeter-wave fine-structure transition (3 P 1–3 P 0) of 13C, [13C i], in the gaseous debris disk of 49 Ceti with the Atacama Large Millimeter/submillimeter Array (ALMA). Recently, the [C i] 3 P 1–3 P 0 emission has been spatially resolved in this source with ALMA. In this data set, the F = 3/2–1/2 hyperfine component of [13C i], which is blueshifted by 2.2 km s−1 from the normal species line, [C i], has been identified in the outer part of the 49 Ceti disk, thanks to the narrow velocity widths of the gas components. The [C i]/[13C i] line intensity ratio is found to be 12 ± 3, which is significantly lower than the 12C/13C abundance ratio of 77 in the interstellar medium. This result clearly reveals that the [C i] emission is optically thick in 49 Ceti at least partly, as speculated by the previous work. As far as we know, this is the first detection of [13C i] 3 P 1–3 P 0 emission at 492 GHz not only in debris disks but also in the interstellar medium. |
| Date | |
| Source |
https://iopscience.iop.org/article/10.3847/2041-8213/ab518d https://doi.org/10.3847/2041-8213/ab518d |
| Author | Aya E. Higuchi, Yoko Oya, and Satoshi Yamamoto |
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