Aims. We prepare real-life cosmic microwave background (CMB) lensing extraction with the forthcoming Plancksatellite data by studying two systematic effects related to theforeground contamination: the impact of foreground residuals after acomponent separation on the lensed CMB map, and the impact of removinga large contaminated region of the sky. Methods. We first use the generalized morphological componentanalysis (GMCA) method to perform a component separation within asimplified framework, which allows a high statistics Monte-Carlo study.For the second systematic, we apply a realistic mask on the temperaturemaps and then restore them with a recently developed inpaintingtechnique on the sphere. We investigate the reconstruction of the CMBlensing from the resultant maps using a quadratic estimator in the flatsky limit and on the full sphere. Results. We find that the foreground residuals from the GMCAmethod does not significantly alter the lensed signal, which is alsotrue for the mask corrected with the inpainting method, even in thepresence of point source residuals. Key words: cosmic microwave background - large-scale structure of Universe - gravitational lensing: weak - methods: statistical
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