A&A 604, A84 (2017) Astronomy DOI: 10.1051/0004-6361/201630287 & c ESO 2017 Astrophysics Mid-infrared interferometric variability of DG Tauri: Implications for the inner-disk structure? J. Varga1, K. É. Gabányi1, P. Ábrahám1, L. Chen1, Á. Kóspál1; 4, J. Menu2, Th. Ratzka3, R. van Boekel4, C. P. Dullemond5, Th. Henning4, W. Jaffe6, A. Juhász7, A. Moór1, L. Mosoni1; 8, and N. Sipos1 1 Konkoly Observatory, Research Centre for Astronomy and Earth Sciences, Hungarian Academy of Sciences, PO Box 67, 1525 Budapest, Hungary e-mail:
[email protected] 2 Instituut voor Sterrenkunde, KU Leuven, Celestijnenlaan 200D, 3001 Leuven, Belgium 3 Institute for Physics/IGAM, NAWI Graz, University of Graz, Universitätsplatz 5/II, 8010 Graz, Austria 4 Max Planck Institute for Astronomy, Königstuhl 17, 69117 Heidelberg, Germany 5 Institute for Theoretical Astrophysics, Heidelberg University, Albert-Ueberle-Strasse 2, 69120 Heidelberg, Germany 6 Leiden Observatory, Leiden University, Niels Bohrweg 2, 2333 CA Leiden, The Netherlands 7 Institute of Astronomy, Madingley Road, Cambridge CB3 OHA, UK 8 Park of Stars in Zselic, 064/2 hrsz., 7477 Zselickisfalud, Hungary Received 19 December 2016 / Accepted 6 April 2017 ABSTRACT Context. DG Tau is a low-mass pre-main sequence star, whose strongly accreting protoplanetary disk exhibits a so-far enigmatic be- havior: its mid-infrared thermal emission is strongly time-variable, even turning the 10 µm silicate feature from emission to absorption temporarily. Aims. We look for the reason for the spectral variability at high spatial resolution and at multiple epochs. Methods. Infrared interferometry can spatially resolve the thermal emission of the circumstellar disk, also giving information about dust processing.