Literature DB >> 31427830

Oxygen fractionation in dense molecular clouds.

Jean-Christophe Loison1, Valentine Wakelam2, Pierre Gratier2, Kevin M Hickson1, Aurore Bacmann3, Marcelino Agùndez4, Nuria Marcelino4, José Cernicharo4, Viviana Guzman5, Maryvonne Gerin6, Javier R Goicoechea7, Evelyne Roueff8, Franck Le Petit8, Jérome Pety9,6, Asunción Fuente10, Pablo Riviere-Marichalar4.   

Abstract

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, O2, and SO2. This large effect is due to the efficiency of the neutral 18O + NO, 18O + SO, and 18O + O2 exchange reactions. The modeling 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 S16O/S18O 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.

Entities:  

Keywords:  ISM: abundances; ISM: clouds; Physical Data and Processes: astrochemistry

Year:  2019        PMID： 31427830      PMCID： PMC6699989          DOI： 10.1093/mnras/stz560

Source DB:  PubMed          Journal:  Mon Not R Astron Soc        ISSN： 0035-8711            Impact factor:   5.287


  8 in total

1.  CO self-shielding as the origin of oxygen isotope anomalies in the early solar nebula.

Authors:  J R Lyons; E D Young
Journal:  Nature       Date:  2005-05-19       Impact factor: 49.962

2.  The oxygen isotopic composition of the Sun inferred from captured solar wind.

Authors:  K D McKeegan; A P A Kallio; V S Heber; G Jarzebinski; P H Mao; C D Coath; T Kunihiro; R C Wiens; J E Nordholt; R W Moses; D B Reisenfeld; A J G Jurewicz; D S Burnett
Journal:  Science       Date:  2011-06-24       Impact factor: 47.728

3.  H2, H3+ and the age of molecular clouds and prestellar cores.

Authors:  L Pagani; P Lesaffre; E Roueff; M Jorfi; P Honvault; T González-Lezana; A Faure
Journal:  Philos Trans A Math Phys Eng Sci       Date:  2012-11-13       Impact factor: 4.226

4.  Quantum dynamics of (16)O + (36)O2 and (18)O + (32)O2 exchange reactions.

Authors:  T Rajagopala Rao; G Guillon; S Mahapatra; P Honvault
Journal:  J Chem Phys       Date:  2015-05-07       Impact factor: 3.488

5.  Termolecular ion-molecule reactions in Titan's atmosphere. IV. A search made at up to 1 micron in pure hydrocarbons.

Authors:  Vincent G Anicich; Paul Wilson; Murray J McEwan
Journal:  J Am Soc Mass Spectrom       Date:  2003-08       Impact factor: 3.109

6.  The interstellar chemistry of C3H and C3H2 isomers.

Authors:  Jean-Christophe Loison; Marcelino Agúndez; Valentine Wakelam; Evelyne Roueff; Pierre Gratier; Núria Marcelino; Dianailys Nuñez Reyes; José Cernicharo; Maryvonne Gerin
Journal:  Mon Not R Astron Soc       Date:  2017-10-01       Impact factor: 5.287

7.  Constraints from Comets on the Formation and Volatile Acquisition of the Planets and Satellites.

Authors:  K E Mandt; O Mousis; B Marty; T Cavalié; W Harris; P Hartogh; K Willacy
Journal:  Space Sci Rev       Date:  2015-05-21       Impact factor: 8.017

8.  The interstellar chemistry of H2C3O isomers.

Authors:  Jean-Christophe Loison; Marcelino Agúndez; Núria Marcelino; Valentine Wakelam; Kevin M Hickson; José Cernicharo; Maryvonne Gerin; Evelyne Roueff; Michel Guélin
Journal:  Mon Not R Astron Soc       Date:  2016-03-11       Impact factor: 5.287
  8 in total
  1 in total

1.  Gas phase Elemental abundances in Molecular cloudS (GEMS) II. On the quest for the sulphur reservoir in molecular clouds: the H2S case.

Authors:  D Navarro-Almaida; R Le Gal; A Fuente; P Rivière-Marichalar; V Wakelam; S Cazaux; P Caselli; Jacob C Laas; T Alonso-Albi; J C Loison; M Gerin; C Kramer; E Roueff; R Bachiller; B Commerçon; R Friesen; S García-Burillo; J R Goicoechea; B M Giuliano; I Jiménez-Serra; J M Kirk; V Lattanzi; J Malinen; N Marcelino; R Martín-Domènech; G M Muñoz Caro; J Pineda; B Tercero; S P Treviño-Morales; O Roncero; A Hacar; M Tafalla; D Ward-Thompson
Journal:  Astron Astrophys       Date:  2020-05-12       Impact factor: 5.802
  1 in total

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