Modelling carbon-chain species formation in lukewarm corinos with new multi-phase models

Abstract

Abundant carbon-chain species have been observed towards lukewarm corinos L1527, B228, and L483. These carbon-chain species are believed to be synthesized in the gas phase after CH${}_4$ desorbs from the dust grain surface at the temperature around 30 K. We investigate carbon-chain species formation in lukewarm corinos using a more rigorous numerical method and advanced surface chemical models. We use the macroscopic Monte Carlo method in simulations. In addition to the two-phase model, the basic multiphase model and the new multiphase models are used for modeling surface chemistry on dust grains. All volatile species can sublime at their sublimation temperatures in the two-phase model while most volatile species are frozen in the ice mantle before water ice sublimes in the basic and the new multiphase models. The new multiphase models allow more volatile species to sublime at their sublimation temperatures than the basic multiphase model does. When T $\sim$ 30 K, the abundances of gaseous CH${}_4$ and CO in the two-phase model are the highest while the basic multiphase model predicts the lowest CO and CH${}_4$ abundances among all models. The abundances of carbon-chain species in the basic and the new multiphase models are lower than that in the two-phase model when T $\sim$ 30 K because CH${}_4$ is crucial for the synthesis of carbon-chain species. The two-phase model performs the best to predict carbon-chain species abundances to fit observations while the basic multiphase model works the worst. The abundances of carbon-chain species predicted by the new multiphase models agree reasonably well with observations. The amount of CH${}_4$ that can diffuse inside the ice mantle, thus sublime upon warm-up plays a crucial role in the synthesis of carbon-chain species in the gas phase. The carbon-chain species observed in lukewarm corinos may be able to gauge surface chemical models.

References in corpus (28)

• 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
• Physical structure and CO abundance of low-mass protostellar envelopes
• Detection of the simplest sugar, glycolaldehyde, in a solar-type protostar with ALMA
• Molecular Inventories and Chemical Evolution of Low-mass Protostellar Envelopes
• Molecular Evolution and Star Formation: From Prestellar Cores to Protostellar Cores
• Chemistry in Disks. IV. Benchmarking gas-grain chemical models with surface reactions
• Constraining the abundances of complex organics in the inner regions of solar-type protostars
• Near-arcsecond resolution observations of the hot corino of the solar type protostar IRAS 16293-2422
• Hot corinos in NGC1333-IRAS4B and IRAS2A
• Photodesorption of water ice: a molecular dynamics study
• A Unified Monte Carlo Treatment of Gas-Grain Chemistry for Large Reaction Networks. II. A Multiphase Gas-Surface-Layered Bulk Model
• Probing the inner 200 AU of low-mass protostars with the Submillimeter Array: Dust and organic molecules in NGC1333-IRAS2A
• Modeling the Lukewarm Corino Phase - is L1527 unique?
• First results from the CALYPSO IRAM-PdBI survey. II. Resolving the hot corino in the Class 0 protostar NGC 1333-IRAS2A
• L483: Warm Carbon-Chain Chemistry Source Harboring Hot Corino Activity
• Discovery of interstellar ketenyl (HCCO), a surprisingly abundant radical
• A Unified Monte Carlo Treatment of Gas-Grain Chemistry for Large Reaction Networks. I. Testing Validity of Rate Equations in Molecular Clouds
• A Search for Carbon-Chain-Rich Cores in Dark Clouds
• Three-dimensional off-lattice Monte Carlo kinetics simulations of interstellar grain chemistry and ice structure
• A Unified Microscopic-Macroscopic Monte Carlo Simulation of Gas-Grain Chemistry in Cold Dense Interstellar Clouds
• Interstellar Simulations Using A Unified Microscopic-Macroscopic Monte Carlo Model with a full Gas-Grain Network including Bulk Diffusion in Ice Mantles
• Discovery of interstellar anions in Cepheus star-forming region
• Carbon-Chain Species in Warm-up Models
• The abundance of C18O and HDO in the envelope and hot core of the intermediate mass protostar NGC 7129 FIRS 2
• Tentative Detection of Deuterated Methane toward the Low-Mass Protostar IRAS 04368+2557 in L1527
• On the origin of C${}_4$H and CH${}_3$OH in protostellar envelopes

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