Formation of Complex Organic Molecules in Cold Interstellar Environments through non-diffusive grain-surface and ice-mantle chemistry

Abstract

A prevailing theory for the interstellar production of complex organic molecules (COMs) involves formation on warm dust-grain surfaces, via the diffusion and reaction of radicals produced through grain-surface photodissociation of stable molecules. However, some gas-phase O-bearing COMs, notably acetaldehyde(CH${}_3$CHO), methyl formate(CH${}_3$OCHO), and dimethyl ether(CH${}_3$OCH${}_3$), are now observed at very low temperatures, challenging the warm scenario. Here, we introduce a selection of new non-diffusive mechanisms into an astrochemical model, to account for the failure of the standard diffusive picture and to provide a more generalized scenario of COM formation on interstellar grains. New generic rate formulations are provided for cases where: (i) radicals are formed by reactions occurring close to another reactant, producing an immediate follow-on reaction; (ii) radicals are formed in an excited state, allowing them to overcome activation barriers to react with nearby stable molecules; (iii) radicals are formed through photo-dissociation close to a reaction partner, followed by immediate reaction. Each process occurs without the diffusion of large radicals. The new mechanisms significantly enhance cold COM abundances, successfully reproducing key observational results for prestellar core L1544. H-abstraction from grain-surface COMs, followed by recombination, plays a crucial role in amplifying chemical desorption into the gas phase. The UV-induced chemistry produces significant COM abundances in the bulk ices, which are retained on the grains and may persist to later stages. O${}_2$ is also formed strongly in the mantle though photolysis, suggesting cometary O${}_2$ could indeed be interstellar.

arXiv comment43 pages, 15 figures, Accepted for publication in ApJS

References in corpus (52)

• Observations of the Icy Universe
• Complex Chemistry in Star-Forming Regions: An Expanded Gas-Grain Warm-up Chemical Model
• Formation of methyl formate and other organic species in the warm-up phase of hot molecular cores
• Non-thermal desorption from interstellar dust grains via exothermic surface reactions
• A three-phase chemical model of hot cores: the formation of glycine
• The ALMA Protostellar Interferometric Line Survey (PILS): First results from an unbiased submillimeter wavelength line survey of the Class 0 protostellar binary IRAS 16293-2422 with ALMA
• Testing grain-surface chemistry in massive hot-core regions
• Photodesorption of Ices II: H2O and D2O
• Observing the gas temperature drop in the high-density nucleus of L 1544
• Formation of complex organic molecules in cold objects: the role of gas phase reactions
• Photodesorption of ices I: CO, N2 and CO2
• Detection of the simplest sugar, glycolaldehyde, in a solar-type protostar with ALMA
• Reactive Desorption and Radiative Association as Possible Drivers of Complex Molecule Formation in the Cold Interstellar Medium
• On the Formation of CO2 and Other Interstellar Ices
• The origin of complex organic molecules in prestellar cores
• Laboratory evidence for efficient water formation in interstellar ices
• The Spatial Distribution of Complex Organic Molecules in the L1544 Pre-stellar Core
• Formation of Complex Molecules in Prestellar Cores: a Multilayer Approach
• H-atom addition and abstraction reactions in mixed CO, H2CO and CH3OH ices: an extended view on complex organic molecule formation
• A cold complex chemistry toward the low-mass protostar B1-b: evidence for complex molecule production in ices
• Experimental evidence for Glycolaldehyde and Ethylene Glycol formation by surface hydrogenation of CO molecules under dense molecular cloud conditions
• Dust as interstellar catalyst I. Quantifying the chemical desorption process
• Complex Molecules in the L1157 Molecular Outflow
• Modeling Complex Organic Molecules in dense regions: Eley-Rideal and complex induced reaction
• The c2d Spitzer Spectroscopic Survey of Ices Around Low-Mass Young Stellar Objects. IV. NH3 and CH3OH
• UV photodesorption of methanol in pure and CO-rich ices: desorption rates of the intact molecule and of the photofragments
• Multilayer formation and evaporation of deuterated ices in prestellar and protostellar cores
• A new modified-rate approach for gas-grain chemical simulations
• First detection of glycolaldehyde outside the Galactic Center
• On Cosmic Ray-Driven Grain Chemistry in Cold Core Models
• Deuterated methanol in the pre-stellar core L1544
• Formation of Glycerol through Hydrogenation of CO ice under Prestellar Core Conditions
• First results from the CALYPSO IRAM-PdBI survey. II. Resolving the hot corino in the Class 0 protostar NGC 1333-IRAS2A
• Arcsecond resolution images of the chemical structure of the low-mass protostar IRAS 16293-2422
• The census of complex organic molecules in the solar type protostar IRAS16293-2422
• Exploring molecular complexity with ALMA (EMoCA): Simulations of branched carbon-chain chemistry in Sgr B2(N)
• CH3OCH3 in Orion-KL: a striking similarity with HCOOCH3
• A primordial origin for molecular oxygen in comets: A chemical kinetics study of the formation and survival of O${}_2$ ice from clouds to disks
• Direct measurement of desorption and diffusion energies of O and N atoms physisorbed on amorphous surfaces
• Complex Organic Molecules Towards Embedded Low-Mass Protostars
• Methanol formation via oxygen insertion chemistry in ice
• Origin of molecular oxygen in Comet 67P/Churyumov-Gerasimenko
• Molecular Oxygen in Oort Cloud Comet 1P/Halley
• Chemical complexity induced by efficient ice evaporation in the Barnard 5 molecular cloud
• Unified Microscopic-Macroscopic Monte Carlo Simulations of Complex Organic Molecule Chemistry in Cold Cores
• Dust opacity variations in the pre-stellar core L1544
• Complex organic molecules in organic-poor massive young stellar objects
• A new model of the chemistry of ionizing radiation in solids: CIRIS
• The efficiency of photodissociation for molecules in interstellar ices
• The sweeping rate in diffusion-mediated reactions on dust grain surfaces
• Accurate rate coefficients for models of interstellar gas-grain chemistry
• Kinetic Monte Carlo simulations of the grain-surface back-diffusion effect

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• A non-energetic mechanism for glycine formation in the interstellar medium
• CORINOS I: JWST/MIRI Spectroscopy and Imaging of a Class 0 protostar IRAS 15398-3359
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• Detection of ethanol, acetone, and propanal in TMC-1: New O-bearing complex organics in cold sources
• Toward the limits of complexity of interstellar chemistry: Rotational spectroscopy and astronomical search for n- and i-butanal
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• Radical Addition and H Abstraction Reactions in C2H2, C2H4 and C2H6: A Gateway for Ethyl and Vinyl Bearing Molecules in the Interstellar Medium
• Methanol Mapping in Cold Cores: Testing Model Predictions
• ALMA-IMF XI: The sample of hot core candidates A rich population of young high-mass proto-stars unveiled by the emission of methyl formate
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• Infrared spectra of complex organic molecules in astronomically relevant ice matrices. III. Methyl formate and its tentative solid-state detection
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• Fine-tuning the complex organic molecule formation: sulfur and CO ice as regulators of surface chemistry
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