Extended Data Fig. 4: Ground-based photometry for WASP-107b from AIT.
a, Nightly photometric observations of WASP-107, acquired with Tennessee State University’s C14 AIT at the Fairborn Observatory during the 2017 observing season. The number of observations (Nobs) was 120. ΔR is the relative flux in the Cousins R band. b, The frequency spectrum of the 2017 observations shows low-amplitude variability with a period (P) of 8.675 days (a frequency, f, of 0.115 cycles per day). c, The data phased to the 8.675-day period have a peak-to-peak amplitude of only 0.005 mag. HJD, heliocentric Julian Date; UCT, coordinated universal time; c/d, cycles per day; Tmin, best-fit ephemeris.
