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Astron. Astrophys. 361, L9-L12 (2000)


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Letter to the Editor

ADONIS observations of the HD 100546 circumstellar dust disk *

E. Pantin 1, C. Waelkens 2 and P.O. Lagage 1

1 DSM/DAPNIA/Service d'Astrophysique, CEA/Saclay, 91191 Gif-sur-Yvette, France
2 Instituut voor Sterrenkunde, Celestijnenlaan 200B, 3001 Leuven, Belgium

Received 29 June 2000 / Accepted 15 July 2000

Abstract

We report in this letter the first resolved images of the circumstellar dust disk around the Pre-Main-Sequence star HD 100546. These near-infrared images were obtained in J and short K bands with the adaptive optics system ADONIS at the ESO observatory. A bright disk extending 2 arcsec (200 AU) far from the star and viewed with an inclination with respect to the line of sight around 50 degrees is revealed by the observations. Using a simplified model of light scattering, we find that the dust disk density peaks at a distance of 40 AU from the star, and the FWHM of this dense ring is typically 20 AU. This type of disk is believed to be a denser precursor of [FORMULA] Pictoris-like main-sequence disks. The structure of the disk is compared with the best known example of the class of "debris disks", the disk surrounding [FORMULA] Pictoris.

Key words: scattering – methods: data analysis – stars: binaries: eclipsing

* based on observations collected on the ESO 3.6m telescope at La Silla, proposal 63.H-0239

Send offprint requests to: E. Pantin

Correspondence to: epantin@cea.fr

© European Southern Observatory (ESO) 2000

Online publication: September 5, 2000

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