First AU-scale observations of V1647 Orionis with VLTI/MIDI

Free access article

Issue		A&A Volume 449, Number 2, April II 2006


Page(s)		L13 - L16
Section		Letters
DOI		http://dx.doi.org/10.1051/0004-6361:20064841

A&A 449, L13-L16 (2006)
DOI: 10.1051/0004-6361:20064841

Letter

First AU-scale observations of V1647 Orionis with VLTI/MIDI

P. Ábrahám¹, L. Mosoni¹, Th. Henning², Á. Kóspál¹, Ch. Leinert², S. P. Quanz² and Th. Ratzka²

¹ Konkoly Observatory of the Hungarian Academy of Sciences, PO Box 67, 1525 Budapest, Hungary
e-mail: abraham@konkoly.hu
² Max-Planck-Institut für Astronomie, Königstuhl 17, 69117 Heidelberg, Germany

(Received 11 January 2006 / Accepted 10 February 2006 )

Abstract
The young eruptive star V1647 Ori was observed with MIDI, the mid-infrared interferometric instrument at the Very Large Telescope Interferometer (VLTI), on March 2, 2005. We present the first spectrally resolved interferometric visibility points for this object. Our results show that (1) the mid-infrared emitting region is extended, having a size of $\approx$ 7 AU at 10 $\mu$ m; (2) no signatures of a close companion can be seen; (3) the $8{-}13\,\mu$ m spectrum exhibits no obvious spectral features. Comparison with similar observations of Herbig Ae stars suggests that V1647 Ori probably possesses a disk of moderate flaring. A simple disk model with $T\sim r^{-0.53}, \Sigma\sim r^{-1.5}, M_{\rm d}=0.05\,{M}_{\odot}$ is able to fit both the spectral energy distribution and the observed visibility values simultaneously.

Key words: stars: formation -- techniques: interferometric -- stars: circumstellar matter -- stars: individual: V1647 Ori -- infrared: stars

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