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Surveys for exoplanetary transits are usually limited not by photon noise but rather by the amount of red noise in their data. In particular, although the  CoRoT  space‐based survey data are being carefully scrutinized, significant new sources of systematic noises are still being discovered. Recently, a magnitude‐dependant systematic effect was discovered in the  CoRoT  data by Mazeh et al. and a phenomenological correction was proposed. Here we tie the observed effect to a particular type of effect, and in the process generalize the popular Sysrem algorithm to include external parameters in a simultaneous solution with the unknown effects. We show that a post‐processing scheme based on this algorithm performs well and indeed allows for the detection of new transit‐like signals that were not previously detected.

The SARS algorithm: detrending CoRoT light curves with Sysrem using simultaneous external parameters