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

V. Piétu 1, 2 Anne Dutrey 3 S. Guilloteau 3 E. Chapillon 3 J. Pety 2, 4
3 AMOR 2007
L3AB - Laboratoire d'astrodynamique, d'astrophysique et d'aéronomie de bordeaux, OASU - Observatoire aquitain des sciences de l'univers, LAB - Laboratoire d'Astrophysique de Bordeaux [Pessac], Université Sciences et Technologies - Bordeaux 1
Abstract : 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 ?.
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Contributeur : Jérôme Pety <>
Soumis le : vendredi 29 août 2008 - 20:17:00
Dernière modification le : lundi 10 décembre 2018 - 01:25:53

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V. Piétu, Anne Dutrey, S. Guilloteau, E. Chapillon, J. Pety. Resolving the inner dust disks surrounding LkCa 15 and MWC 480 at mm wavelengths. Astronomy and Astrophysics - A&A, EDP Sciences, 2006, 460, pp.L43-L47. 〈10.1051/0004-6361:20065968〉. 〈hal-00315759〉



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