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Probing the structure of protoplanetary disks: a comparative study of DM Tau, LkCa 15 and MWC 480

hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
dc.contributor.authorPIÉTU, Vincent
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]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
dc.contributor.authorDUTREY, Anne
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]
hal.structure.identifierUniversité Sciences et Technologies - Bordeaux 1 [UB]
dc.contributor.authorGUILLOTEAU, S.
dc.date.issued2007
dc.identifier.issn0004-6361
dc.description.abstractEnWe report sub-arcsec CO observations of the disks around MWC 480, LkCa 15 and DM Tau, and simultaneous measurements of HCO+ J=1-0. We derive the disk properties by fitting a standard disk model, with all parameters power laws of the distance to the star. Biases are explained and discussed. We find evidence for vertical temperature gradient in the disks of MWC 480 and DM Tau, as in AB Aur, but not in LkCa 15. The disks temperature increase with stellar effective temperature. Most of the CO gas is at temperatures smaller than 17 K, the condensation temperature on grains. The scale height of the CO distribution appears larger (by 50\%) than the hydrostatic scale height. The more UV luminous stars have more CO, but there is no simple dependency of CO abundance and isotopologue ratio with stellar type. The 13CO/HCO+ ratio is around 600. The temperature behaviour is consistent with expectations, but published chemical models have difficulty reproducing the observed CO quantities. Vertical mixing and photo-dissociation at the disk outer edge seem important chemical agents. The CO data suggest a more complex surface density distribution than assumed in models.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enStars: circumstellar matter
dc.subject.enplanetary systems: protoplanetary disks
dc.subject.enindividual: LkCa 15
dc.subject.enMWC 480
dc.subject.enDM Tau
dc.subject.enRadio-lines: stars
dc.title.enProbing the structure of protoplanetary disks: a comparative study of DM Tau, LkCa 15 and MWC 480
dc.typeArticle de revue
dc.subject.halPhysique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO]
dc.subject.halPlanète et Univers [physics]/Astrophysique [astro-ph]
dc.identifier.arxivastro-ph/0701425
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.page163-178
bordeaux.volume467
bordeaux.issue1
bordeaux.peerReviewedoui
hal.identifierhal-00124582
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00124582v1
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