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The space telescope CoRoT has provided light curves of T Tauri starsbelonging to the star-forming region of NGC 2264 with unprecedented continuityand precision in the framework of a coordinated multi-wavelength observationalproject. We perform spot modelling of the optical light curves of fiveweak-line T Tauri stars whose variability is dominated by starspots. We applytwo-spot and evolving single spot models in the framework of a Bayesian MonteCarlo Markov Chain approach to derive the a posteriori distribution of thestarspot parameters and the inclination of the star rotation axis. We focus onthe rotation periods of the spots that can provide evidence for differentialrotation in those stars. We find meaningful results in the case of three starswith an inclination higher than 50 deg and a slow variation of the light curveamplitude. The relative difference of the spot rotation periods ranges from0.02 to 0.05 that is 3-10 times larger than the amplitude of the differentialrotation found in similar stars with Doppler imaging techniques. We concludethat the intrinsic starspot evolution, although very slow, has a significantimpact on the determination of the differential rotation by means of our spotmodelling approach. We estimate typical timescales for the evolution of thestarspot pattern between about 20 and 50 rotation periods in our stars.

Spot modelling of periodic weak-line T Tauri stars observed by CoRoT in NGC 2264