  The signatures of dust processing and grain growth - related to the formation
of rocky planets - are easily seen in mid-infrared spectral features. One
important diagnostic tool in this context is the silicate feature in the
spectra of young stellar objects (YSO). The low-mass YSO, DG Tau shows unique
temporal variations in its silicate feature. We conducted multi-epoch
observations of DG Tau with the MID-Infrared Interferometric instrument of the
Very Large Telescope Interferometer to obtain the spectra of the inner and
outer disk regions in order to investigate where the previously reported
variations of the silicate feature originate from. Here we present the
preliminary results of the first two epochs of observations. We found that on a
time-scale of two months, the source showed significant brightening. At the
same time the mid-infrared emitting region expanded. While the identification
of the silicate feature is difficult, our results qualitatively agree with the
scenario explaining the varying silicate feature with dust lifted up above the
disk.
