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We present seven light curves of the exoplanet system HAT‐P‐3, taken as part of a transit timing programme using the rapid imager to search for exoplanets instrument on the Liverpool Telescope. The light curves are analysed using a Markov chain Monte Carlo algorithm to update the parameters of the system. The inclination is found to be   i = 86.75 +0.22  −0.21  ° , the planet‐star radius ratio to be   R  p / R  ★ = 0.1098 +0.0010  −0.0012   and the stellar radius to be   R  ★ = 0.834 +0.018  −0.026  R ⊙  , consistent with previous results but with a significant improvement in the precision. Central transit times and uncertainties for each light curve are also determined, and a residual permutation algorithm is used as an independent check on the errors. The transit times are found to be consistent with a linear ephemeris, and a new ephemeris is calculated as   T  c (0) = 245 4856.701 18 ± 0.000 18  HJD and   P = 2.899 738 ± 0.000 007  d. Model timing residuals are fitted to the measured timing residuals to place upper mass limits for a hypothetical perturbing planet as a function of the period ratio. These show that we have probed for planets with masses as low as 0.33 and  1.81  M  ⊕   in the interior and exterior 2:1 resonances, respectively, assuming the planets are initially in circular orbits.

A transit timing analysis of seven RISE light curves of the exoplanet system HAT‐P‐3