Light curves of KELT-16

The transits were monitored through standard B, V, R, I filters and four were simultaneously observed from different places, for a total of 36 new light curves. We used these new photometric data and those from the TESS space telescope to review the main physical properties of the KELT-16 planetary system.

Our results agree with previous measurements but are more precise. We estimated the mid-transit times for each of these transits and combined them with others from the literature to obtain 69 epochs, with a time baseline extending over more than 4yr, and searched for transit time variations. We found no evidence for a period change, suggesting a lower limit for orbital decay at 8Myr, with a lower limit on the reduced tidal quality factor of Q'*>(1.9+/-0.8)x10^5^ with 95 per cent confidence.