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We report twelve new transit observations of the exoplanet WASP-4b from theTransit Monitoring in the South Project (TraMoS) project. These transits arecombined with all previously published transit data for this planet to providean improved radius measurement of Rp = 1.395 +- 0.022 Rjup and improved transitephemerides. In a new homogeneous analysis in search for Transit TimingVariations (TTVs) we find no evidence of those with RMS amplitudes larger than20 seconds over a 4-year time span. This lack of TTVs rules out the presence ofadditional planets in the system with masses larger than about 2.5 M_earth, 2.0M_earth, and 1.0 M_earth around the 1:2, 5:3 and 2:1 orbital resonances. Oursearch for the variation of other parameters, such as orbital inclination andtransit depth also yields negative results over the total time span of thetransit observations. Finally we perform a simple study of stellar spotsconfigurations of the system and conclude that the star rotational period isabout 34 days.

monthly notices of the royal astronomical society

TraMoS project III: Improved physical parameters, timing analysis, and  star-spot modelling of the WASP-4b exoplanet system from 38 transit  observations