J/A+A/686/L3ivo://CDS.VizieR/J/A+A/686/L3doi:10.26093/cds/vizier.36869003CDSCabezas C.Agundez M.Endo Y.Tercero B.Lee Y.-P.Marcelino N.,de Vicente P.Cernicharo J.2024-11-29T20:03:34Z2024-05-27T09:24:47ZCDS support team

CDS, Observatoire de Strasbourg, 11 rue de l'Universite, F-67000 Strasbourg, France

cds-question@unistra.fratomic-physicsWe present the detection of cyanothioketene, NCCHCS, in the laboratory and toward TMC-1. This transient species was produced through a discharge of a gas mixture of CH_2_CHCN and CS_2_ using argon as carrier gas, and its rotational spectrum between 9 and 40GHz was characterized using a Balle-Flygare narrowband-type Fourier-transform microwave spectrometer. A total of 21 rotational transitions were detected in the laboratory, all of them exhibiting hyperfine structure induced by the spin of the N nucleus. The spectrum for NCCHCS was predicted in the domain of our line surveys using the derived rotational and distortion constants. The detection in the cold starless core TMC-1 was based on the QUIJOTE line survey performed with the Yebes 40m radio telescope. Twenty-three lines were detected with Ka=0, 1, and 2 and Ju=9 up to 14. The derived column density is (1.2+/-0.1)10^11^cm^-2^ for a rotational temperature of 8.5+/-1K. The abundance ratio of thioketene and its cyano derivative, H_2_CCS/NCCHCS, is 6.5+/-1.3. Although ketene is more abundant than thioketene by about 15 times, its cyano derivative NCCHCO surprisingly is not detected with a 3sigma upper level to the column density of 3.0x10^10^cm^-2^, which results in an abundance ratio H_2_CCO/NCCHCO>430. Hence, the chemistry of CN derivatives seems to be more favored for S-bearing than for O-bearing molecules. We carried out chemical modeling calculations and found that the gas-phase neutral-neutral reactions CC+H_2_CS and CN+H_2_CCS could be a source of NCCHCS in TMC-1.2024A&A...686L...3Chttps://cdsarc.cds.unistra.fr/viz-bin/cat/J/A+A/686/L3CatalogResearchIsServedByTAP VizieR generic servicehttps://cds.unistra.fr/vizier-org/licences_vizier.htmlhttps://vizier.cds.unistra.fr/viz-bin/VizieR-2?-source=J/A+A/686/L3https://vizier.iucaa.in/viz-bin/VizieR-2?-source=J/A+A/686/L3http://vizieridia.saao.ac.za/viz-bin/VizieR-2?-source=J/A+A/686/L3https://vizier.cds.unistra.fr/viz-bin/votable?-source=J/A+A/686/L3https://vizier.iucaa.in/viz-bin/votable?-source=J/A+A/686/L3http://vizieridia.saao.ac.za/viz-bin/votable?-source=J/A+A/686/L3GETtext/xml+votablehttps://tapvizier.cds.unistra.fr/TAPVizieR/tapdefaultJ/A+A/686/L3/tablea2Predicted frequencies for NCCHCSrecnoRecord number assigned by the VizieR team. Should Not be used for identification.meta.recordintFreqFrequencyMHzem.freqdoublee_FreqFrequency uncertaintyMHzstat.errorfloatlogIntBase 10 logarithm of the integrated intensitylog(nm**2.MHz)spect.line.intensitydoubleDRDegrees of freedom of rotation partition functioncm**-1stat.fit.dofintElowLower state energycm**-1phys.energydoubleGupUpper state degeneracycm**-1phys.electron.degenintTAGMolecular identifiermeta.id;meta.mainintQNFMTQuantum numbers codephys.mol.qnintJ'Quantum number J for upper levelinstr.det.qeintKa'Quantum number Ka for upper levelphys.mol.qnintKc'Quantum number Kc for upper levelphys.mol.qnintF'Quantum number F for upper levelphys.mol.qnintJ"Quantum number N for lower levelphys.mol.qnintKa"Quantum number Ka for lower levelphys.mol.qnintKc"Quantum number Kc for lower levelphys.mol.qnintF"Quantum number F for lower levelphys.mol.qnint