Discovery of thiofulminic acid with the QUIJOTE line survey: A study of the isomers of HNCS and HNCO in TMC-1

Abstract

We present the first detection of HCNS (thiofulminic acid) in space with the QUIJOTE line survey in the direction of TMC-1. We performed a complete study of the isomers of CHNS and CHNO, including NCO and NCS. The derived column densities for HCNS, HNCS, and HSCN are (9.0+/-0.5)e9, (3.2+/-0.1)e11, and (8.3+/-0.4)e11 cm-2, respectively. The HNCS/HSCN abundance ratio is 0.38. The abundance ratios HNCO/HNCS, HCNO/HCNS, HOCN/HSCN, and NCO/NCS are 34+/-4, 8.3+/-0.7, 0.18+/-0.03, and 0.78+/-0.07, respectively. These ratios cannot be correctly reproduced by our gas-phase chemical models, which suggests that formation paths for these species are missing, and/or that the adopted dissociative recombination rates for their protonated precursors have to be revised. The isotopologues H15NCO, DNCO, N13CO, DCNO, H34SCN, and DSCN have also been detected with the ultrasensitive QUIJOTE line survey.

Accepted as a Letter in Astronomy & Astrophysics on 09 January 2024

References in corpus (19)

• Discovery of benzyne, o-C6H4, in TMC-1 with the QUIJOTE line survey
• Discovery of Fulminic Acid, HCNO, in Dark Clouds
• Yebes 40 m radio telescope and the broad band NANOCOSMOS receivers at 7 mm and 3 mm for line surveys
• The interstellar gas-phase chemistry of HCN and HNC
• TMC-1, the starless core sulfur factory: Discovery of NCS, HCCS, H2CCS, H2CCCS, and C4S and detection of C5S
• Discovery of HC4NC in TMC-1: A study of the isomers of HC3N, HC5N, and HC7N
• Discovery of fulvenallene in TMC-1 with the QUIJOTE line survey
• Space and laboratory discovery of HC3S+
• The sulphur saga in TMC-1: Discovery of HCSCN and HCSCCH
• Discovery of the C7N- anion in TMC-1 and IRC+10216
• Discovery of the elusive thioketenylium, HCCS+, in TMC-1
• Discovery of two new interstellar molecules with QUIJOTE: HCCCHCCC and HCCCCS
• The abundance and excitation of molecular anions in interstellar clouds
• Molecular Polymorphism: Microwave Spectra, Equilibrium Structures, and an Astronomical Investigation of the HNCS Isomeric Family
• A new protonated molecule discovered in TMC-1: HCCNCH+
• Gas-phase Elemental abundances in Molecular cloudS (GEMS) III. Unlocking the CS chemistry: the CS+O reaction
• Discovery of five cyano derivatives of propene with the QUIJOTE line survey
• Detection of deuterated methylcyanoacetylene, CH${}_2$DC${}_3$N, in TMC-1
• New deuterated species in TMC-1: Detection of CH2DC4H with the QUIJOTE line survey

Cited by in corpus (5)

• Laboratory and astronomical discovery of cyanothioketene, NCCHCS, in the cold starless core TMC-1
• Doubly substituted isotopologues of HCCCN in TMC-1: Detection of D13CCCN, DC13CCN, DCC13CN, DCCC15N, H13C13CCN, H13CC13CN, HC13C13CN, HCC13C15N, and HC13CC15N
• Synthesis and Spectroscopic Characterization of Interstellar Candidate Ethynyl Thiocyanate: HCCSCN
• Chemistry of Dark Molecular Clouds
• Spatial distribution of organics in the Horsehead nebula: Signposts of chemistry driven by atomic carbon