Chemical modelling of complex organic molecules with peptide-like bonds in star-forming regions
| dc.contributor.author | QUÉNARD, David | |
| dc.contributor.author | JIMÉNEZ-SERRA, Izaskun | |
| dc.contributor.author | VITI, Serena | |
| dc.contributor.author | HOLDSHIP, Jon | |
| hal.structure.identifier | AMOR 2017 | |
| dc.contributor.author | COUTENS, Audrey | |
| dc.date.issued | 2018 | |
| dc.identifier.issn | 0035-8711 | |
| dc.description.abstractEn | Peptide bonds (N-C=O) play a key role in metabolic processes since they link amino acids into peptide chains or proteins. Recently, several molecules containing peptide-like bonds have been detected across multiple environments in the interstellar medium (ISM), growing the need to fully understand their chemistry and their role in forming larger pre-biotic molecules. We present a comprehensive study of the chemistry of three molecules containing peptide-like bonds: HNCO, NH$_2$CHO, and CH$_3$NCO. We also included other CHNO isomers (HCNO, HOCN), and C$_2$H$_3$NO isomers (CH$_3$OCN, CH$_3$CNO) to the study. We have used the \uclchem gas-grain chemical code and included in our chemical network all possible formation/destruction pathways of these peptide-like molecules recently investigated either by theoretical calculations or in laboratory experiments. Our predictions are compared to observations obtained toward the proto-star IRAS16293$-$2422 and the L1544 pre-stellar core. Our results show that some key reactions involving the CHNO and C$_2$H$_3$NO isomers need to be modified to match the observations. Consistently with recent laboratory findings, hydrogenation is unlikely to produce NH$_2$CHO on grain surfaces, while a combination of radical-radical surface reactions and gas-phase reactions is a better alternative. In addition, better results are obtained for NH$_2$CHO when a slightly higher activation energy of 25$\,$K is considered for the gas-phase reaction $\rm NH_2 + H_2CO \rightarrow NH_2CHO + H$. Finally, our modelling shows that the observed correlation between NH$_2$CHO and HNCO in star-forming regions may come from the fact that HNCO and NH$_2$CHO react to temperature in the same manner rather than from a direct chemical link between the two species. | |
| dc.language.iso | en | |
| dc.publisher | Oxford University Press (OUP): Policy P - Oxford Open Option A | |
| dc.subject.en | Astrophysics - Solar and Stellar Astrophysics | |
| dc.subject.en | Astrophysics - Astrophysics of Galaxies | |
| dc.title.en | Chemical modelling of complex organic molecules with peptide-like bonds in star-forming regions | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1093/mnras/stx2960 | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO] | |
| dc.identifier.arxiv | 1711.05184 | |
| bordeaux.journal | Monthly Notices of the Royal Astronomical Society | |
| bordeaux.page | 2796-2812 | |
| bordeaux.volume | 474 | |
| bordeaux.issue | 2 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-01650912 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Internationale | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-01650912v1 | |
| bordeaux.COinS | ctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Monthly%20Notices%20of%20the%20Royal%20Astronomical%20Society&rft.date=2018&rft.volume=474&rft.issue=2&rft.spage=2796-2812&rft.epage=2796-2812&rft.eissn=0035-8711&rft.issn=0035-8711&rft.au=QU%C3%89NARD,%20David&JIM%C3%89NEZ-SERRA,%20Izaskun&VITI,%20Serena&HOLDSHIP,%20Jon&COUTENS,%20Audrey&rft.genre=article |
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