The prebiotic molecular inventory of Serpens SMM1

Aims. Methyl isocyanate (CH 3 NCO) and glycolonitrile (HOCH 2 CN) are isomers prebiotic molecules that involved in the formation of peptide structures nucleobase adenine, respectively. These two species investigated to study interstellar chemistry cyanides (CN) isocyanates (NCO) gain insight into reservoir molecules. Methods. ALMA observations intermediate-mass Class 0 protostar Serpens SMM1-a ALMA-PILS data low-mass IRAS 16293B used. Spectra analysed with CASSIS line analysis software package order identify characterise Results. CH NCO, HOCH CN, various other detected towards SMM1-a. CN is identified PILS a spectrum extracted at half-beam offset position from peak continuum. NCO equally abundant [X]/[CH OH] 5.3 × 10 −4 6.2 , A comparison between shows HNCO more former source, but abundances do not differ significantly. Data sources used show [CH NCO]/[HNCO] ratio similar all these within ~10%. Conclusions. The new detections additional evidence for large can contribute biomolecules on planets. equal indicate their driven by kinetic processes instead thermodynamic equilibrium, which would drive one product. found be much than 16293B. From observational data, it difficult pathway thermal Strecker-like reaction − H CO possibility. ratios available sample studied either chemically related or affected physical conditions same way. Both likely form early during star formation, presumably via ice mantle reactions taking place dark cloud when mantles being heated hot core. relatively high may explained prolonged stage warm mantles, where energetic processing HCN results efficient both species.