Abstract
The circumstellar disks around young stellar objects play a key role in the formation process of stars and provide the stage for planet formation. Since recently, infrared interferometry provides the spatial resolution required to directly study the distribution of the gas and dust in the innermost AU around the forming star. We present recent investigations in which we employed the VLTI and its near- and mid-infrared interferometric instruments AMBER and MIDI to constrain the geometry and physical conditions of the disks around Herbig Ae/Be stars and to study the accretion and outflow processes taking place close to the central star.
