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Disks around CQ Tau and MWC 758: Dense PDRs or gas dispersal ?

hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorCHAPILLON, E.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorGUILLOTEAU, S.
hal.structure.identifierLaboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux [L3AB]
hal.structure.identifierObservatoire aquitain des sciences de l'univers [OASU]
hal.structure.identifierLaboratoire d'Astrophysique de Bordeaux [Pessac] [LAB]
dc.contributor.authorDUTREY, Anne
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
hal.structure.identifierLaboratoire d'Astrophysique de Grenoble [LAOG]
dc.contributor.authorPIÉTU, V.
dc.date.issued2008
dc.date.conference2008
dc.description.abstractEnThe Herbig Ae stars are the massive analogs of the TTauri stars. Very few disks surrounding these kind of stars have been studied in detail. To better constraint the disks parameters (temperature and density) we observed the disks around CQ Tau and MWC 758 with the IRAM array in continuum and CO line emissions. The disks properties are derived using a standard parametric model. The two sources show a surprising low CO abundance (assuming a standard gas-to-dust ratio). We use the Meudon PDR code to study the chemistry. For CQ Tau we find that photodissociation of CO is a viable mechanism to explain the CO depletion without modifying the gas-to-dust ratio. However, we find in both sources that the temperature of large grains can be low enough to prevent CO from being released from the grain surfaces. In addition the low inclination of the CQ Tau disk challenges the UX Ori classification of this star. We conclude that CO does not appear as a direct tracer of the gas-to-dust ratio.
dc.language.isoen
dc.source.titleSF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics - 2008sf2a.conf..303C
dc.title.enDisks around CQ Tau and MWC 758: Dense PDRs or gas dispersal ?
dc.typeCommunication dans un congrès
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Planétologie et astrophysique de la terre [astro-ph.EP]
bordeaux.page303
bordeaux.conference.titleSF2A-2008
bordeaux.countryFR
bordeaux.title.proceedingSF2A-2008: Proceedings of the Annual meeting of the French Society of Astronomy and Astrophysics - 2008sf2a.conf..303C
bordeaux.conference.cityParis
bordeaux.peerReviewedoui
hal.identifierhal-00401914
hal.version1
hal.invitednon
hal.proceedingsoui
hal.popularnon
hal.audienceInternationale
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00401914v1
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