Molecules in the Carbon-rich Protoplanetary Nebula CRL 2688

We present observations of the carbon-rich protoplanetary nebula CRL 2688 made with the Institut de Radioastronomie Millimétrique 30 m telescope in the 3 and 2 mm bands. In total, 196 transition lines belonging to 38 molecular species and isotopologues are detected, among which, to the best of our k...

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Bibliographic Details
Published in:The Astrophysical journal. Supplement series 2022-04, Vol.259 (2), p.56
Main Authors: Qiu, Jian-Jie, Zhang, Yong, Zhang, Jiang-Shui, Nakashima, Jun-ichi
Format: Article
Language:English
Subjects:
Carbon
Circumstellar envelopes
Circumstellar gas
Circumstellar matter
Circumstellar shells
Molecular gas
Molecular spectroscopy
Nebulae
Protoplanetary nebulae
Stellar envelopes
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Summary:We present observations of the carbon-rich protoplanetary nebula CRL 2688 made with the Institut de Radioastronomie Millimétrique 30 m telescope in the 3 and 2 mm bands. In total, 196 transition lines belonging to 38 molecular species and isotopologues are detected, among which, to the best of our knowledge, 153 transition lines and 13 species are the first reported for this object. Additionally, in order to contribute to future research, we have collected observational data on the molecular lines of CRL 2688 from the literature and compiled them into a single unified catalog. We find that the molecular abundance of CRL 2688 cannot be explained by the standard model of a circumstellar envelope. The implications of metal-bearing molecules on circumstellar chemistry are discussed.
ISSN:0067-0049
1538-4365
DOI:10.3847/1538-4365/ac5180