Terms Photometry of Known Transiting Exoplanets
The Transit Ephemeris Refinement and Monitoring Survey conducts radial velocity and photometric monitoring of known exoplanets in order to refine planetary orbits and predictions of possible transit times. This effort is primarily directed toward planets not known to transit, but a small sample of our targets consists of known transiting systems. Here we present precision photometry for six WASP (Wide Angle Search for Planets) planets acquired during their transit windows. We perform a Markov Chain Monte Carlo analysis for each planet and combine these data with previous measurements to redetermine the period and ephemerides for these planets. These observations provide recent mid transit times which are useful for scheduling future observations. Our results improve the ephemerides of WASP 4b, WASP 5b, and WASP 6b and reduce the uncertainties on the mid transit time for WASP 29b. We also confirm the orbital, stellar, and planetary parameters of all six systems.