Detection limits estimated from the closure phases of the IRDIS dual-band data. The confidence level of the contrast limits is 5σ and the used narrowband filters are indicated in the legend. From top to bottom, the panels show the limits for HD 100453, HD 100546, HD 135344 B, and PDS 70. The gray lines show the corresponding masses at the distance and stellar magnitude of each system, on the scale of the right axis (see main text for details). The green shading indicates the approximate gap regions that are seen in scattered light images with dark colors corresponding to higher fluxes (see also Fig. 3). The vertically dashed line indicates the millimeter cavity radius of HD 100453 that is within the field-of-view of the observations.