Journal
MONTHLY NOTICES OF THE ROYAL ASTRONOMICAL SOCIETY
Volume 485, Issue 4, Pages 5777-5789Publisher
OXFORD UNIV PRESS
DOI: 10.1093/mnras/stz560
Keywords
ISM: abundances; ISM: clouds; Physical Data and Processes: astrochemistry
Categories
Funding
- programme 'Physique et Chimie du Milieu Interstellaire' (PCMI) - CNRS
- CNES
- ERC Starting Grant (3DICE) [336474]
- Nouvelle Aquitaine region
- Spanish MICIU [AYA2016-75066-C2-1-P, AYA2017-85111-P]
- European Research Council [ERC-2013-Syg-610256-NANOCOSMOS]
- Ramon y Cajal programme of Spanish MICIU [RyC-2014-16277]
- INSU/CNRS (France)
- MPG (Germany)
- IGN (Spain)
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We have developed the first gas-grain chemical model for oxygen fractionation (also including sulphur fractionation) in dense molecular clouds, demonstrating that gas-phase chemistry generates variable oxygen fractionation levels, with a particularly strong effect for NO, SO, O-2, and SO2. This large effect is due to the efficiency of the neutral O-18 + NO, O-18 + SO, and O-18 + O-2 exchange reactions. The modelling results were compared to new and existing observed isotopic ratios in a selection of cold cores. The good agreement between model and observations requires that the gas-phase abundance of neutral oxygen atoms is large in the observed regions. The (SO)-O-16/(SO)-O-18 ratio is predicted to vary substantially over time, showing that it can be used as a sensitive chemical proxy for matter evolution in dense molecular clouds.
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