Methyl isocyanate CH3NCO: An important missing organic in current astrochemical networks

Abstract

Methyl isocyanate (CH3NCO) is one of the important complex organic molecules detected on the comet 67P/Churyumov-Gerasimenko by Rosetta's Philae lander. It was also detected in hot cores around high-mass protostars along with a recent detection in the solar-type protostar IRAS 16293-2422. We propose here a gas-grain chemical model to form CH3NCO after reviewing various formation pathways with quantum chemical computations. We have used NAUTILUS 3-phase gas-grain chemical model to compare observed abundances in the IRAS 16293-2422. Our chemical model clearly indicates the ice phase origin of CH3NCO.

arXiv commentAccepted for publication in MNRAS Letters

References in corpus (18)

• Non-thermal desorption from interstellar dust grains via exothermic surface reactions
• The 2014 KIDA network for interstellar chemistry
• Gas and grain chemical composition in cold cores as predicted by the Nautilus 3-phase model
• Chemistry of Dark Clouds: Databases, Networks, and Models
• Binding energies: new values and impact on the efficiency of chemical desorption
• Modeling Complex Organic Molecules in dense regions: Eley-Rideal and complex induced reaction
• Rotational spectroscopy, tentative interstellar detection, and chemical modelling of N-methylformamide
• Oxygen depletion in dense molecular clouds: a clue to a low O2 abundance?
• The chemistry of fluorine-bearing molecules in diffuse and dense interstellar gas clouds
• Complex organic molecules in comets C/2012 F6 (Lemmon) and C/2013 R1 (Lovejoy): detection of ethylene glycol and formamide
• A 3-5$\mu$m VLT spectroscopic survey of embedded young low mass stars II; OCN${}^{-}$
• The ALMA-PILS survey: Detection of CH${}_3$NCO toward the low-mass protostar IRAS 16293-2422 and laboratory constraints on its formation
• The IRAM-30m line survey of the Horsehead PDR: III. High abundance of complex (iso-)nitrile molecules in UV-illuminated gas
• Interstellar Detection of Methyl Isocyanate CH${}_3$NCO in Sgr B2(N): A Link from Molecular Clouds to Comets
• Detection of CH3SH in protostar IRAS 16293-2422
• Detection of methylisocyanate (CH3NCO) in a solar-type protostar
• Chemical modeling of water deuteration in IRAS16293-2422
• A proposed chemical scheme for HCCO formation in cold dense clouds

Cited by in corpus (13)

• The formation of peptide-like molecules on interstellar dust grains
• First detection of the pre-biotic molecule glycolonitrile (HOCH2CN) in the interstellar medium
• The GUAPOS project II. A comprehensive study of peptide-like bond molecules
• First detection of C${}_2$H${}_5$NCO in the ISM and search of other isocyanates towards the G+0.693-0.027 molecular cloud
• Isomers in Interstellar Environments (I): The Case of Z- and E-Cyanomethanimine
• Resolving desorption of complex organic molecules in a hot core: Transition from non-thermal to thermal desorption or two-step thermal desorption?
• The prebiotic molecular inventory of Serpens SMM1 I. An investigation of the isomers CH${}_3$NCO and HOCH${}_2$CN
• An Ammonia Spectral Map of the L1495-B218 Filaments in the Taurus Molecular Cloud: II CCS & HC${}_7$N Chemistry and Three Modes of Star Formation in the Filaments
• Detection of HOCO+ in the protostar IRAS 16293-2422
• Temperature spectra of interstellar dust grains heated by cosmic-rays II: dark cloud cores
• Chemical Differentiation around Five Massive Protostars Revealed by ALMA -Carbon-Chain Species, Oxygen-/Nitrogen-Bearing Complex Organic Molecules-
• Quantitative estimates of chemical disequilibrium in Titan's atmosphere
• Millimeter wave spectrum and search for vinyl isocyanate toward Sgr B2(N) with ALMA