Discovery of linear propadienone: Study of the chemistry of linear and cyclic H$_2$C$_3$O and H$_2$C$_3$S in TMC-1
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2025
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| author | Esplugues, G. Loison, J. C. Agúndez, M. Molpeceres, G. Marcelino, N. Tercero, B. Cernicharo, J. |
| author_facet | Esplugues, G. Loison, J. C. Agúndez, M. Molpeceres, G. Marcelino, N. Tercero, B. Cernicharo, J. |
| contents | We report the first detection in space of propadienone, the linear isomer (l-H$_2$C$_3$O) of cyclopropenone (c-H$_2$C$_3$O). We also report the first detection of the isotopologue c-H$_2$$^{13}$CCCO, and c-HDCCCO of c-H$_2$C$_3$O. The astronomical observations are part of QUIJOTE, a line survey of TMC-1 in the frequency range 31.0-50.3 GHz, complemented with data between 71.6-116.0 GHz, and carried out with Yebes-40m and IRAM-30m telescopes, respectively. We obtain a total column density of 3.7$\times$10$^{10}$ cm$^{-2}$ for l-H$_2$C$_3$O at an excitation temperature of 4.8 K. We find that the isomer is about eight times less abundant than the cyclic one. We also report a detailed line-by-line study of cyclopropenethione (c-H$_2$C$_3$S) to compare the abundance of the O and S isomers. We find that cyclic O-isomers are more abundant than cyclic S-isomers; however, the opposite trend is found for the most stable linear isomers, with l-H$_2$C$_3$S being more than one order of magnitude more abundant than l-H$_2$C$_3$O. A comprehensive theoretical chemical analysis shows that the abundances of the H$_2$C$_3$O and H$_2$C$_3$S isomers are controlled by different formation pathways. In particular, while l-H$_2$C$_3$O is potentially produced by dissociative electron recombination reactions, ion-neutral chemistry is more effective at producing l-H$_2$C$_3$S and c-H$_2$C$_3$S. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2511_19775 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Discovery of linear propadienone: Study of the chemistry of linear and cyclic H$_2$C$_3$O and H$_2$C$_3$S in TMC-1 Esplugues, G. Loison, J. C. Agúndez, M. Molpeceres, G. Marcelino, N. Tercero, B. Cernicharo, J. Astrophysics of Galaxies We report the first detection in space of propadienone, the linear isomer (l-H$_2$C$_3$O) of cyclopropenone (c-H$_2$C$_3$O). We also report the first detection of the isotopologue c-H$_2$$^{13}$CCCO, and c-HDCCCO of c-H$_2$C$_3$O. The astronomical observations are part of QUIJOTE, a line survey of TMC-1 in the frequency range 31.0-50.3 GHz, complemented with data between 71.6-116.0 GHz, and carried out with Yebes-40m and IRAM-30m telescopes, respectively. We obtain a total column density of 3.7$\times$10$^{10}$ cm$^{-2}$ for l-H$_2$C$_3$O at an excitation temperature of 4.8 K. We find that the isomer is about eight times less abundant than the cyclic one. We also report a detailed line-by-line study of cyclopropenethione (c-H$_2$C$_3$S) to compare the abundance of the O and S isomers. We find that cyclic O-isomers are more abundant than cyclic S-isomers; however, the opposite trend is found for the most stable linear isomers, with l-H$_2$C$_3$S being more than one order of magnitude more abundant than l-H$_2$C$_3$O. A comprehensive theoretical chemical analysis shows that the abundances of the H$_2$C$_3$O and H$_2$C$_3$S isomers are controlled by different formation pathways. In particular, while l-H$_2$C$_3$O is potentially produced by dissociative electron recombination reactions, ion-neutral chemistry is more effective at producing l-H$_2$C$_3$S and c-H$_2$C$_3$S. |
| title | Discovery of linear propadienone: Study of the chemistry of linear and cyclic H$_2$C$_3$O and H$_2$C$_3$S in TMC-1 |
| topic | Astrophysics of Galaxies |
| url | https://arxiv.org/abs/2511.19775 |