Sita, Madelyn L., Changala, P. Bryan, Xue, Ci ORCID: 0000-0003-2760-2119, Burkhardt, Andrew M., Shingledecker, Christopher N., Lee, Kin Long Kelvin ORCID: 0000-0002-1903-9242, Loomis, Ryan A., Momjian, Emmanuel, Siebert, Mark A., Gupta, Divita ORCID: 0000-0002-6639-4909, Herbst, Eric, Remijan, Anthony J., McCarthy, Michael C., Cooke, Ilsa R. and McGuire, Brett A. (2022). Discovery of Interstellar 2-Cyanoindene (2-C9H7CN) in GOTHAM Observations of TMC-1. Astrophys. J. Lett., 938 (2). BRISTOL: IOP Publishing Ltd. ISSN 2041-8213

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Abstract

We present laboratory rotational spectroscopy of five isomers of cyanoindene (2-, 4-, 5-, 6-, and 7-cyanoindene) using a cavity Fourier transform microwave spectrometer operating between 6 and 40 GHz. Based on these measurements, we report the detection of 2-cyanoindene (1H-indene-2-carbonitrile; 2-C9H7CN) in GOTHAM line survey observations of the dark molecular cloud TMC-1 using the Green Bank Telescope at centimeter wavelengths. Using a combination of Markov Chain Monte Carlo, spectral stacking, and matched filtering techniques, we find evidence for the presence of this molecule at the 6.3 sigma level. This provides the first direct observation of the ratio of a cyano-substituted polycyclic aromatic hydrocarbon to its pure hydrocarbon counterpart, in this case indene, in the same source. We discuss the possible formation chemistry of this species, including why we have only detected one of the isomers in TMC-1. We then examine the overall hydrocarbon:CN-substituted ratio across this and other simpler species, as well as compare to those ratios predicted by astrochemical models. We conclude that while astrochemical models are not yet sufficiently accurate to reproduce absolute abundances of these species, they do a good job at predicting the ratios of hydrocarbon:CN-substituted species, further solidifying -CN tagged species as excellent proxies for their fully symmetric counterparts.

Item Type: Journal Article
Creators:
CreatorsEmailORCIDORCID Put Code
Sita, Madelyn L.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Changala, P. BryanUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Xue, CiUNSPECIFIEDorcid.org/0000-0003-2760-2119UNSPECIFIED
Burkhardt, Andrew M.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Shingledecker, Christopher N.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Lee, Kin Long KelvinUNSPECIFIEDorcid.org/0000-0002-1903-9242UNSPECIFIED
Loomis, Ryan A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Momjian, EmmanuelUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Siebert, Mark A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Gupta, DivitaUNSPECIFIEDorcid.org/0000-0002-6639-4909UNSPECIFIED
Herbst, EricUNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Remijan, Anthony J.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
McCarthy, Michael C.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
Cooke, Ilsa R.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
McGuire, Brett A.UNSPECIFIEDUNSPECIFIEDUNSPECIFIED
URN: urn:nbn:de:hbz:38-691137
DOI: 10.3847/2041-8213/ac92f4
Journal or Publication Title: Astrophys. J. Lett.
Volume: 938
Number: 2
Date: 2022
Publisher: IOP Publishing Ltd
Place of Publication: BRISTOL
ISSN: 2041-8213
Language: English
Faculty: Unspecified
Divisions: Unspecified
Subjects: no entry
Uncontrolled Keywords:
KeywordsLanguage
TEMPERATURE RATE COEFFICIENTS; CN; RADICALS; C2H; BENZENEMultiple languages
Astronomy & AstrophysicsMultiple languages
URI: http://kups.ub.uni-koeln.de/id/eprint/69113

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