Enhanced formation of interstellar complex organic molecules on carbon monoxide ice

Abstract

We investigate the role of carbon monoxide ice in the chemical evolution of prestellar cores using astrochemical rate equation models. We constrain the ratios of the binding energies on CO ice and H${}_2$O ice for a series of adsorbates deemed important in diffusive chemistry on H${}_2$O ices. We later include these ratios in our chemical reaction network model, where the binding and diffusion energies of icy species vary as a function of the surface composition. When the surface coverage of CO increases, the model shows an enhancement of O-bearing complex organic molecules, especially those formed from the intermediate products of CO hydrogenation (e.g. HCO) and CH${}_3$/CH${}_2$. Because the binding energy of CH${}_3$/CH${}_2$ is in the right range, its diffusion rate increases significantly with CO coverage. At $T>$14 K and with less influence, enhanced diffusion of HCO also contributes to the increase of the abundances of COM. We find, however, that chemistry is not always enhanced on CO ice and that the temperature and cosmic ray ionization rate of each astronomical object is crucial for this particular chemistry, revealing a highly non-trivial behavior that needs to be addressed on a per-case basis. Our results are highly relevant in the context of interstellar ice observations with JWST.

arXiv commentAccepted for publication in Astronomy and Astrophysics

References in corpus (68)

• Observations of the Icy Universe
• Formation rates of complex organics in UV irradiated CH3OH-rich ices I: Experiments
• Non-thermal desorption from interstellar dust grains via exothermic surface reactions
• A three-phase chemical model of hot cores: the formation of glycine
• Cosmic-ray ionization of molecular clouds
• An Ice Age JWST inventory of dense molecular cloud ices
• On the Formation of CO2 and Other Interstellar Ices
• Detection of a branched alkyl molecule in the interstellar medium: iso-propyl cyanide
• Laboratory evidence for efficient water formation in interstellar ices
• Binding energies: new values and impact on the efficiency of chemical desorption
• The Spatial Distribution of Complex Organic Molecules in the L1544 Pre-stellar Core
• H-atom addition and abstraction reactions in mixed CO, H2CO and CH3OH ices: an extended view on complex organic molecule formation
• Desorption rates and sticking coefficients for CO and N2 interstellar ices
• Experimental evidence for Glycolaldehyde and Ethylene Glycol formation by surface hydrogenation of CO molecules under dense molecular cloud conditions
• Experimental evidence for water formation on interstellar dust grains by hydrogen and oxygen atoms
• Cosmic-ray ionisation in circumstellar discs
• Modeling Complex Organic Molecules in dense regions: Eley-Rideal and complex induced reaction
• Formation of complex organic molecules in hot molecular cores through nondiffusive grain-surface and ice-mantle chemistry
• Surface chemistry in the interstellar medium - I - H2 formation by Langmuir-Hinshelwood and Eley-Rideal mechanisms
• UV photodesorption of methanol in pure and CO-rich ices: desorption rates of the intact molecule and of the photofragments
• Formation of Complex Organic Molecules in Cold Interstellar Environments through non-diffusive grain-surface and ice-mantle chemistry
• HI Narrow Self-Absorption in Dark Clouds: Correlations with Molecular Gas and Implications for Cloud Evolution and Star Formation
• Multilayer formation and evaporation of deuterated ices in prestellar and protostellar cores
• Can Formamide Be Formed on Interstellar Ice? An Atomistic Perspective
• Binding energies of interstellar molecules on crystalline and amorphous models of water ice by ab-initio calculations
• A non-energetic mechanism for glycine formation in the interstellar medium
• Gas-grain chemistry in cold interstellar cloud cores with a microscopic Monte Carlo approach to surface chemistry
• Formation of Glycerol through Hydrogenation of CO ice under Prestellar Core Conditions
• Simultaneous Hydrogenation and UV-photolysis Experiments of NO in CO-rich Interstellar Ice Analogues; linking HNCO, OCN-, NH2CHO and NH2OH
• Interstellar formamide (NH${}_2$CHO), a key prebiotic precursor
• Formaldehyde and methanol deuteration in protostars: fossiles from a past fast high density pre-collapse phase
• Water deuteration and ortho-to-para nuclear spin ratio of H2 in molecular clouds formed via the accumulation of HI gas
• Formation of the prebiotic molecule NH${}_2$CHO on astronomical amorphous solid water surfaces: accurate tunneling rate calculations
• The (impossible?) formation of acetaldehyde on the grain surfaces: insights from quantum chemical calculations
• Formation of COMs through CO hydrogenation on interstellar grains
• Interstellar ices as witnesses of star formation: selective deuteration of water and organic molecules unveiled
• Quantum mechanical simulations of the radical-radical chemistry on icy surfaces
• Adsorption energies of carbon, nitrogen, and oxygen atoms on the low-temperature amorphous water ice: A systematic estimation from quantum chemistry calculations
• Hydrogenation at low temperatures does not always lead to saturation: the case of HNCO
• Comparison of UV and high-energy ion irradiation of methanol:ammonia ice
• Production of atomic hydrogen by cosmic rays in dark clouds
• Atom Tunneling in the Water Formation Reaction H${}_2$ + OH $\to$ H${}_2$O + H on an Ice Surface
• Carbon Atom Reactivity with Amorphous Solid Water: H${}_2$O Catalyzed Formation of H${}_2$CO
• Study of the photon-induced formation and subsequent desorption of CH3 OH and H2 CO in interstellar ice analogs
• Hydrogenation of accreting C-atoms and CO molecules -- simulating ketene and acetaldehyde formation under dark and translucent cloud conditions
• Binding Energy Evaluation Platform: A database of quantum chemical binding energy distributions for the astrochemical community
• The cosmic-ray ionisation rate in the pre-stellar core L1544
• Hunt for complex cyanides in protostellar ices with JWST: Tentative detection of CH${}_3$CN and C${}_2$H${}_5$CN
• A twist on the reaction of the CN radical with methylamine in the interstellar medium: new hints from a state-of-the-art quantum-chemical study
• The complex organic molecular content in the L1498 starless core
• Diffusion activation energy and desorption activation energy for astrochemically relevant species on water ice show no clear relation
• Formation of Acetaldehyde on CO-rich Ices
• Formation of complex organic molecules on interstellar CO ices? Insights from computational chemistry simulations
• H3+ Spectroscopy and the Ionization Rate of Molecular Hydrogen in the Central Few Parsecs of the Galaxy
• Methanol ice co-desorption as a mechanism to explain cold methanol in the gas-phase
• The complex organic molecular content in the L1517B starless core
• A new model of the chemistry of ionizing radiation in solids: CIRIS
• On the relevance of the H2 + O reaction pathway for the surface formation of interstellar water - A combined experimental and modeling study
• Chemical complexity of phosphorous bearing species in various regions of the Interstellar medium
• Acetaldehyde binding energies: a coupled experimental and theoretical study
• Radical Addition and H Abstraction Reactions in C2H2, C2H4 and C2H6: A Gateway for Ethyl and Vinyl Bearing Molecules in the Interstellar Medium
• A New "Non-energetic" Route to Complex Organic Molecules in Astrophysical Environments: The C + H${}_2$O $\to$ H${}_2$CO Solid-state Reaction
• Adsorption of H${}_2$ on Amorphous Solid Water Studied with Molecular Dynamics Simulations
• Is there any linkage between interstellar aldehyde and alcohol?
• Cracking the Puzzle of CO2 Formation on Interstellar Ices. Quantum Chemical and Kinetic Study of the CO + OH -> CO2 + H Reaction
• Tracing the atomic nitrogen abundance in star-forming regions with ammonia deuteration
• The formation of CO${}_2$ through consumption of gas-phase CO on vacuum-UV irradiated water ice
• Resonant infrared irradiation of CO and CH3OH interstellar ices

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• CO Adsorption Sites on Interstellar Water Ices Explored with Machine Learning Potentials. Binding energy distributions and snowline
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• Diffusive vs. non-diffusive paths to interstellar hydrogen peroxide. A machine learning-based molecular dynamics study
• Complex Organic Molecules towards the central molecular zone of NGC 253
• Chemical constraints on the dynamical evolution of the cold core L694
• A sensitivity analysis of interstellar ice chemistry in astrochemical models
• Isotopomer-Specific Carbon Isotope Ratio of Complex Organic Molecules in Star-Forming Cores
• Fine-tuning the complex organic molecule formation: sulfur and CO ice as regulators of surface chemistry
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