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

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 ~ 7 AU at 10 um; (2) no signatures of a close companion can be seen; (3) the 8-13 um 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 ~ r^{-0.53}, Σ~ r^{-1.5}, M_d = 0.05 M_Sun is able to fit both the spectral energy distribution and the observed visibility values simultaneously.