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In this thesis we have analysed the time evolution of the photometricprecision achieved by the space-based exoplanet-hunting mission CoRoT duringits flight phase (2007-2012). This study of the noise level of CoRoT lightcurves has been based on a previous paper by Aigrain et al. 2009, where theyfound a gradual degradation of the photometric performance over time for thefirst 14 months of data. Here we have analysed the anti-center runs IRa01(2007), LRa01 (2008), LRa03 (2010) and LRa06 (2012). The two first runs werestudied by Aigrain as well, so we are able to compare our results. The two lastruns allowed us to evaluate the trend of photometric degradation over more than5 years. We obtain low observational point-to-point noise, although a factor 3bigger than the source photon noise. We find effects showing the ageing of theCoRoT CCDs. On 2h time scales we notice a receding photometric performance,with a noise increase of about 2.1 times across the four analysed runs,corresponding to a 15% increase per year. Correlated noise becomes moreimportant than white uncorrelated noise for the two last studied runs, LRa03and LRa06. The strongest degradation, however, occurs during the first year ofoperations, with a 30% noise increase, opening up a two-ageing-timescalesscenario.

Ageing of a space-based CCD: photometric performance development of the low Earth orbiting detectors of the CoRoT mission