Abstract

In order to study disk perturbation during the periastron we used the PIONIER (low resolution H-band) and AMBER (high resolution, Brγ region) interferometers, ESO/APEX LABOCA and SABOCA bolometers and the CARMA array. Reference observations of the unperturbed disk were obtained in 2010 and early 2011, more observations at the time of the periastron and the following 1-2 months. While the compact H-band disk was only little affected during the periastron, Brγ disk shows strong variations in the visibility profiles during the first months after the periastron. Radio observations lead to detection of the disk at 0.35, 0.87, 1 and 3 mm. The periastron was followed by a drop in the radio flux by 10-15%.