2024-03-28T20:55:07Zhttp://digital.csic.es/dspace-oai/requestoai:digital.csic.es:10261/2079462022-10-25T09:06:06Zcom_10261_14181com_10261_4col_10261_14182
Oxygen fractionation in dense molecular clouds
Loison, Jean-Christophe
Wakelam, V.
Gratier, P.
Hickson, Kevin M.
Bacmann, A.
Agúndez, Marcelino
Marcelino, Nuria
Cernicharo, José
Guzmán, Viviana
Gerin, M.
Goicoechea, Javier R.
Roueff, E.
Petit, F.L.
Pety, J.
Fuente, A.
Riviere-Marichalar, Pablo
Centre National de la Recherche Scientifique (France)
Université de Bordeaux
Ministerio de Economía y Competitividad (España)
Ministerio de Ciencia, Innovación y Universidades (España)
European Commission
Max Planck Society
Instituto Geográfico Nacional (España)
ISM: abundances
ISM: clouds
Physical Data and Processes: astrochemistry
22 pags., 5 figs.
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, and SO. This large effect is due to the efficiency of the neutral O + NO, O + SO, and O + O 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/SO 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.
2020-04-16T17:52:11Z
2020-04-16T17:52:11Z
2019-02-27
2020-04-16T17:52:11Z
artículo
Monthly Notices of the Royal Astronomical Society 485: 5777-5789 (2019)
http://hdl.handle.net/10261/207946
10.1093/mnras/stz560
http://dx.doi.org/10.13039/501100006251
http://dx.doi.org/10.13039/501100004189
http://dx.doi.org/10.13039/501100003329
http://dx.doi.org/10.13039/501100000780
http://dx.doi.org/10.13039/501100004794
31427830
Postprint
http://dx.doi.org/10.1093/mnras/stz560
Sí
info:eu-repo/grantAgreement/EC/FP7/336474
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/AYA2016-75066-C2-1-P
info:eu-repo/grantAgreement/AEI/Plan Estatal de Investigación Científica y Técnica y de Innovación 2017-2020/AYA2017-85111-P
info:eu-repo/grantAgreement/EC/FP7/610256
info:eu-repo/grantAgreement/MINECO/Plan Estatal de Investigación Científica y Técnica y de Innovación 2013-2016/RYC-2014-16277
openAccess
Blackwell Publishing