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We consider future balloon-borne and ground-based suborbital experimentsdesigned to search for inflationary gravitational waves, and investigate theimpact of residual foregrounds that remain in the estimated cosmic microwavebackground maps. This is achieved by propagating foreground modellinguncertainties from the component separation, under the assumption of aspatially uniform foreground frequency scaling, through to the power spectrumestimates, and up to measurement of the tensor to scalar ratio in the parameterestimation step. We characterize the error covariance due to subtractedforegrounds, and find it to be subdominant compared to instrumental noise andsample variance in our simulated data analysis. We model the unsubtractedresidual foreground contribution using a two-parameter power law and show thatmarginalization over these foreground parameters is effective in accounting fora bias due to excess foreground power at low $\ell$. We conclude that, at leastin the suborbital experimental setups we have simulated, foreground errors maybe modeled and propagated up to parameter estimation with only a slightdegradation of the target sensitivity of these experiments derived neglectingthe presence of the foregrounds.

Estimating the tensor-to-scalar ratio and the effect of residual foreground contamination