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Abreg: We investigate the impact of polarized foreground emission on theperformances of future CMB experiments in measuring the tensor-to-scalar ratior. We design a component separation pipeline, based on the Smica method, aimedat estimating r and the foreground contamination from the data with no priorassumption on the frequency dependence or spatial distribution of theforegrounds. We derive error bars accounting for the uncertainty on foregroundcontribution. We use the current knowledge of galactic and extra-galacticforegrounds as implemented in the Planck Sky Model (PSM), to build simulationsof the sky emission for various experimental setups. Our method, permits us todetect r = 0.1 at more than 3 sigma from B-modes only with Planck data, and r =0.001 at 6 sigma for the most ambitious designs of the future EPIC probe. Wefind that all-sky experiments permit a proper measurement of the reionizationbump despite the large scale foreground emission and are nearly insensitive tocontamination from point sources and lensing if their statistical contributioncan be modelled accurately. Investigating the observation of a small but cleanpart of the sky, we show that diffuse foregrounds remain a concern for asensitive ground-based experiment with a limited frequency coverage whenmeasuring r < 0.1, but are dealt with efficiently by a deep field space missionwhich is in return quite sensitive to lensing. Our results do not significantlydepend on the overall level and frequency dependence of the diffused foregroundmodel.

Measuring the tensor to scalar ratio from CMB B-modes in presence of foregrounds