Photometry of Proxima Centauri from 2006 to 2017

The planet Proxima b discovered by Anglada-Escude et al. (2016Natur.536..437A) with an orbital period of 11.186 days has an a priori transit probability of ~1.5%; if it transits, the predicted transit depth is about 5 mmag. In Blank et al. (2018AJ....155..228B), we analyzed 96 of our light curves that overlapped with predicted transit ephemerides from previously published tentative transit detections and found no evidence in our data that would corroborate claims of transits with a period of 11.186 days.

Here we broaden our analysis, using 262 high-quality light curves from our data set to search for any periodic transit-like events over a range of periods from 1 to 30 days. We also inject a series of simulated planet transits and find that our data are sufficiently sensitive to have detected transits of 5 mmag depth, with recoverability ranging from ~100% for an orbital period of 1 day to ~20% for an orbital period of 20 days for the parameter spaces tested.