delta Sco 2011 periastron passage: interferometric, mid-IR and radio mm observations 

In order to study disk perturbation during the periastron we used the Pionier (low resolution H band) and AMBER (high 
resolution, Br gamma region) interferometers, VLT UT3/VISIR (Q1 and Q3 band photometry, ESO APEX Laboca and Saboca 
bolometers and the CARMA array (fluxes at 1 and 3 mm). Reference observations of the unperturbed disk were obtained in 
2010 and early 2011, more observations at the time of the periastron and following 1-2 months.
  
While the compact H-band disk was only little affected during the periastron, Br gamma disk shows strong variations in the 
visibility profiles during the first month after the periastron. Radio observations lead to detection of the disk at 0.35, 0.87 1 and 
3mm. The periastron was followed by a drop in the radio flux by 10-15 %. Interpretation of the observations requires a 
complete dynamical modeling of the disk.