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We present a mid-IR interferometric survey of the circumstellar environmentof a specific class of post-Asymptotic Giant Branch (post-AGB) binaries. Forthis class the presence of a compact dusty disk has been postulated on thebasis of various spatially unresolved measurements. Our interferometric surveywas performed with the MIDI instrument on the VLTI. In total 19 differentsystems were observed using variable baseline configurations. Combining all thevisibilities at a single wavelength at 10.7 micron, we fitted two parametricmodels to the data: a uniform disk (UD) and a ring model mimicking atemperature gradient. We compared our observables of the whole sample, withsynthetic data computed from a grid of radiative transfer models of passivelyirradiated disks in hydrostatic equilibrium. These models are computed with aMonte Carlo code that has been widely applied to describe the structure ofprotoplanetary disks around young stellar objects (YSO). The spatially resolvedobservations show that the majority of our targets cluster closely together inthe distance-independent size-colour diagram, and have extremely compact N-bandemission regions. The typical uniform disk diameter of the N-band emissionregion is about 40 mass which corresponds to a typical brightness temperatureof 400-600~K. The resolved objects display very similar characteristics in theinterferometric observables and in the spectral energy distributions.Therefore, the physical properties of the disks around our targets must besimilar. The grid of protoplanetary disk models covers very well the observedobjects. Much like for young stars, the spatially resolved N-band emissionregion is determined by the hot inner rim of the disk. Continued comparisonsbetween post-AGB and protoplanetary disks will help to understand grain growthand disk evolution processes,

A mid-IR interferometric survey with MIDI/VLTI: resolving the second-generation protoplanetary disks around post-AGB binaries