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Issue A&A Volume 414, Number 1, January IV 2004 Page(s) L9 - L12 Section Letters DOI 10.1051/0004-6361:20031722

A&A 414, L9-L12 (2004)
DOI: 10.1051/0004-6361:20031722

Letter

SIMBA's view of the  Eri disk

O. Schütz¹, M. Nielbock², S. Wolf³, Th. Henning¹ and S. Els<sup>4

1</sup>  Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany
²  Ruhr-Universität Bochum, Astronomisches Institut, Universitätsstr. 150, 44780 Bochum, Germany
³  California Institute of Technology, 1201 E California Blvd, Mail code 105-24, Pasadena, CA 91125, USA
⁴  Isaac-Newton-Group of Telescopes, Apartado de Correos 321, 38700 Santa Cruz de La Palma, Spain

(Received 6 November 2003 / Accepted 5 December 2003)

Abstract
We present the first observational confirmation for an extended circumstellar dust disk around  Eri . The observations were obtained with the bolometer array SIMBA at the 15 m radio telescope SEST in Chile and measure the dust continuum at 1.2 mm. The emission, with a total flux of 21.4 mJy and a rms of 2.2 mJy/beam, is resolved to a deconvolved size of 27 4 which corresponds to 88 AU. No clear indication for a ring-like disk structure is seen, possibly also due to the telescope's large beam width of 24 ''. Models of the object's spectral energy distribution from IR to mm-wavelengths show that the emission can also be explained by a simple disk model. We further demonstrate the strong influence of noise and propose to be cautious with interpretations of the ring substructure.

Key words: stars: individual: Eri -- circumstellar matter -- planetary systems -- submillimeter

Offprint request: O. Schütz, schuetz@mpia.de

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