Afficher la notice abrégée

Cold CO in circumstellar disks. On the effects of photodesorption and vertical mixing

hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorHERSANT, F.
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierDepartment of Physics [OSU]
dc.contributor.authorWAKELAM, Valentine
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorDUTREY, Anne
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
dc.contributor.authorGUILLOTEAU, S.
hal.structure.identifierDepartment of Physics, The Ohio State University
hal.structure.identifierOhio State University [Columbus] [OSU]
hal.structure.identifierDepartment of Physics [OHIO STATE UNIVERSITY]
dc.contributor.authorHERBST, E.
dc.date.issued2009
dc.identifier.issn0004-6361
dc.description.abstractEnAims. We attempt to understand the presence of gas phase CO below its sublimation temperature in circumstellar disks. We study two promising mechanisms to explain this phenomenon: turbulent mixing and photodesorption. Methods: We compute the chemical evolution of circumstellar disks including grain surface reactions with and without turbulent mixing and CO photodesorption. Results: We show that photodesorption significantly enhances the gas phase CO abundance, by extracting CO from the grains when the visual extinction remains below about 5 mag. However, the resulting dependence of column density on radial distance is inconsistent with observations so far. We propose that this inconsistency could be the result of grain growth. On the other hand, the influence of turbulent mixing is not found to be straightforward. The efficiency of turbulent mixing depends upon a variety of parameters, including the disk structure. For the set of parameters we chose, turbulent mixing is not found to have any significant influence on the CO column density.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enstars: circumstellar matter
dc.subject.enstars: planetary systems: protoplanetary disks
dc.subject.enastrochemistry
dc.subject.enturbulence
dc.title.enCold CO in circumstellar disks. On the effects of photodesorption and vertical mixing
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361:200811082
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Astrophysique stellaire et solaire [astro-ph.SR]
dc.identifier.arxiv0812.1714
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageL49-L52
bordeaux.volume493
bordeaux.peerReviewedoui
hal.identifierhal-00366015
hal.version1
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00366015v1
bordeaux.COinSctx_ver=Z39.88-2004&rft_val_fmt=info:ofi/fmt:kev:mtx:journal&rft.jtitle=Astronomy%20and%20Astrophysics%20-%20A&A&rft.date=2009&rft.volume=493&rft.spage=L49-L52&rft.epage=L49-L52&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=HERSANT,%20F.&WAKELAM,%20Valentine&DUTREY,%20Anne&GUILLOTEAU,%20S.&HERBST,%20E.&rft.genre=article


Fichier(s) constituant ce document

FichiersTailleFormatVue

Il n'y a pas de fichiers associés à ce document.

Ce document figure dans la(les) collection(s) suivante(s)

Afficher la notice abrégée