The Prebiotic Molecular Inventory of Serpens SMM1: II. The Building Blocks of Peptide Chains
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This work aims to constrain the abundances of interstellar amides, by searching for this group of prebiotic molecules in the intermediate-mass protostar Serpens SMM1-a. ALMA observations are conducted toward Serpens SMM1. A spectrum is extracted toward the SMM1-a position and analyzed with the CASSIS line analysis software for the presence of characteristic rotational lines of a number of amides and other molecules. NH2CHO, NH2CHO nu(12) = 1, (NH2CHO)-C-13, CH3C(O)-NH2 nu = 0, 1, CH2DOH, CH3CHO, and CH3C(O)CH3 are securely detected, while trans-NHDCHO, NH2CDO, CH3NHCHO nu = 0, 1, CH3COOH, and HOCH2CHO are tentatively identified. The results of this work are compared with detections presented in the literature. A uniform CH3C(O)NH2/NH2CHO ratio is found for a group of interstellar sources with vast physical differences. A similar ratio is seen for CH3NHCHO, based on a smaller data sample. The D/H ratio of NH2CHO is about 1-3% and is close to values found in the low-mass source IRAS 16293-2422B. The formation of CH3C(O)NH2 and NH2CHO is likely linked. Formation of these molecules on grain surfaces during the dark cloud stage is a likely scenario. The high D/H ratio of NH2CHO is also seen as an indication that these molecules are formed on icy dust grains. As a direct consequence, amides are expected to be present in the most pristine material from which planetary systems form, thus providing a reservoir of prebiotic material.
Originalsprog | Engelsk |
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Tidsskrift | ACS Earth and Space Chemistry |
Vol/bind | 6 |
Udgave nummer | 3 |
Sider (fra-til) | 455-467 |
Antal sider | 13 |
ISSN | 2472-3452 |
DOI | |
Status | Udgivet - 17 mar. 2022 |
Links
- https://arxiv.org/pdf/2012.15672.pdf
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