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Resolving the inner dust disks surrounding LkCa 15 and MWC 480 at mm wavelengths

hal.structure.identifierLaboratoire d'Astrophysique de Grenoble [LAOG]
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
dc.contributor.authorPIÉTU, V.
hal.structure.identifierAMOR 2007
dc.contributor.authorDUTREY, Anne
hal.structure.identifierAMOR 2007
dc.contributor.authorGUILLOTEAU, S.
hal.structure.identifierAMOR 2007
dc.contributor.authorCHAPILLON, E.
hal.structure.identifierInstitut de RadioAstronomie Millimétrique [IRAM]
hal.structure.identifierLaboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA]
dc.contributor.authorPETY, J.
dc.date.issued2006-12
dc.identifier.issn0004-6361
dc.description.abstractEnAims.We constrain the dust distribution and its properties (temperature, emissivity) in inner proto-planetary disks Methods: .We performed sub-arcsecond high-sensitivity interferometric observations of the thermal dust emission at 1.4 mm and 2.8 mm in the disks surrounding LkCa 15 and MWC 480, with the new 750 m baselines of the IRAM PdBI array. This provides a linear resolution of ~60 AU at the distance of Taurus. Results: .We report the existence of a cavity of ~50 AU radius in the inner disk of LkCa 15. Whereas LkCa 15 emission is optically thin, the optically thick core of MWC 480 is resolved at 1.4 mm with a radius of ~35 AU, constraining the dust temperature. In MWC 480, the dust emission is coming from a colder layer than the CO emission, most likely the disk mid-plane. Conclusions: .These observations provide direct evidence of an inner cavity around LkCa 15. Such a cavity most probably results from the tidal disturbance created by a low-mass companion or large planet at ~30 AU from the star. These results suggest that planetary system formation is already at work in LkCa 15. They also indicate that the classical steady-state viscous disk model is too simplistic a description of the inner 50 AU of "proto-planetary" disks and that the disk evolution is coupled to the planet formation process. The MWC 480 results indicate that a proper estimate of the dust temperature and size of the optically thick core are essential for determining the dust emissivity index ?.
dc.language.isoen
dc.publisherEDP Sciences
dc.subject.enplanetary systems: protoplanetary disks
dc.subject.enstars: circumstellar matter
dc.subject.enstars: individual: LkCa 15
dc.subject.enstars: individual: MWC 480
dc.subject.enradio-continuum: stars
dc.title.enResolving the inner dust disks surrounding LkCa 15 and MWC 480 at mm wavelengths
dc.typeArticle de revue
dc.identifier.doi10.1051/0004-6361:20065968
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/0610200
bordeaux.journalAstronomy and Astrophysics - A&A
bordeaux.pageL43-L47
bordeaux.volume460
bordeaux.peerReviewedoui
hal.identifierhal-00315759
hal.version1
hal.popularnon
hal.audienceNon spécifiée
hal.origin.linkhttps://hal.archives-ouvertes.fr//hal-00315759v1
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=2006-12&rft.volume=460&rft.spage=L43-L47&rft.epage=L43-L47&rft.eissn=0004-6361&rft.issn=0004-6361&rft.au=PI%C3%89TU,%20V.&DUTREY,%20Anne&GUILLOTEAU,%20S.&CHAPILLON,%20E.&PETY,%20J.&rft.genre=article


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