There is not a global consensus on what are the main physical mechanisms that create the inner cavities in transition disks.
Constrains on the dust properties (such as grain size or surface density) could help us to discriminate about different theories that have been proposed to explain the mm and sub-mm observations of these objects.
Using resolved ALMA and VLA observations of six transition disks (CQTau, DMTau, LkCa15, RXJ1615, SR24S, and UXTau), we model their dust continuum visibilities and obtain multi-wavelength brightness radial profiles, which are then used to constrain the dust properties as a function of radius, and where we look for signatures of the different physical mechanisms (e.g. dust traps) that could be taking place in each disk.