NGTS clusters survey. IV.

We also investigated the occurrence rate of disks in our targets, again using a machine learning approach. We find that all dippers have disks, and most of these are full disks. We use dipper periodicity and model-derived stellar masses to identify the orbital distance to the inner disk edge for dipper objects, confirming that dipper stars exhibit strongly extended sublimation radii, adding weight to arguments that the inner disk edge is further out than predicted by simple models.

Finally, we determine a dipper fraction (the fraction of stars with disks which are dippers) for known members of 27.8+/-2.9 per cent. Our findings represent the largest population of dippers identified in a single cluster to date.