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We present 13 high-precision and four additional light curves of four brightsouthern-hemisphere transiting planetary systems: WASP-22, WASP-41, WASP-42 andWASP-55. In the cases of WASP-42 and WASP-55, these are the first follow-upobservations since their discovery papers. We present refined measurements ofthe physical properties and orbital ephemerides of all four systems. Noindications of transit timing variations were seen. All four planets have radiiinflated above those expected from theoretical models of gas-giant planets;WASP-55b is the most discrepant with a mass of 0.63 Mjup and a radius of 1.34Rjup. WASP-41 shows brightness anomalies during transit due to the planetocculting spots on the stellar surface. Two anomalies observed 3.1 d apart arevery likely due to the same spot. We measure its change in position anddetermine a rotation period for the host star of 18.6 +/- 1.5 d, in goodagreement with a published measurement from spot-induced brightness modulation,and a sky-projected orbital obliquity of lambda = 6 +/- 11 degrees. We concludewith a compilation of obliquity measurements from spot-tracking analyses and adiscussion of this technique in the study of the orbital configurations of hotJupiters.

High-precision photometry by telescope defocussing. VIII. WASP-22, WASP-41, WASP-42 and WASP-55