Resolving the inner dust disks surrounding LkCa 15 and MWC 480 at mm wavelengths
| hal.structure.identifier | Laboratoire d'Astrophysique de Grenoble [LAOG] | |
| hal.structure.identifier | Institut de RadioAstronomie Millimétrique [IRAM] | |
| dc.contributor.author | PIÉTU, V. | |
| hal.structure.identifier | AMOR 2007 | |
| dc.contributor.author | DUTREY, Anne | |
| hal.structure.identifier | AMOR 2007 | |
| dc.contributor.author | GUILLOTEAU, S. | |
| hal.structure.identifier | AMOR 2007 | |
| dc.contributor.author | CHAPILLON, E. | |
| hal.structure.identifier | Institut de RadioAstronomie Millimétrique [IRAM] | |
| hal.structure.identifier | Laboratoire d'Etude du Rayonnement et de la Matière en Astrophysique [LERMA] | |
| dc.contributor.author | PETY, J. | |
| dc.date.issued | 2006-12 | |
| dc.identifier.issn | 0004-6361 | |
| dc.description.abstractEn | Aims.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.iso | en | |
| dc.publisher | EDP Sciences | |
| dc.subject.en | planetary systems: protoplanetary disks | |
| dc.subject.en | stars: circumstellar matter | |
| dc.subject.en | stars: individual: LkCa 15 | |
| dc.subject.en | stars: individual: MWC 480 | |
| dc.subject.en | radio-continuum: stars | |
| dc.title.en | Resolving the inner dust disks surrounding LkCa 15 and MWC 480 at mm wavelengths | |
| dc.type | Article de revue | |
| dc.identifier.doi | 10.1051/0004-6361:20065968 | |
| dc.subject.hal | Physique [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO] | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph]/Cosmologie et astrophysique extra-galactique [astro-ph.CO] | |
| dc.subject.hal | Planète et Univers [physics]/Astrophysique [astro-ph] | |
| dc.identifier.arxiv | astro-ph/0610200 | |
| bordeaux.journal | Astronomy and Astrophysics - A&A | |
| bordeaux.page | L43-L47 | |
| bordeaux.volume | 460 | |
| bordeaux.peerReviewed | oui | |
| hal.identifier | hal-00315759 | |
| hal.version | 1 | |
| hal.popular | non | |
| hal.audience | Non spécifiée | |
| hal.origin.link | https://hal.archives-ouvertes.fr//hal-00315759v1 | |
| bordeaux.COinS | ctx_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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