Estimates of the expected CIB-induced biases (as a fraction of the lensing potential power spectrum) to the temperature-only lensing spectrum reconstruction at 217 GHz (without any cleaning), and for the SMICA frequency weighting. The large-scale-structure bispectrum causes the quadratic estimator applied to the CIB map to correlate with the lensing signal, sourcing a 2% negative bias at 217 GHz (blue) on our conservative multipole range. This is reduced by an order of magnitude after SMICA cleaning (orange). The bias remains sub-percent in the tSZ-deprojected SMICA weighting (green). The CIB trispectrum sources a smaller contribution (red and purple at 217 GHz and for SMICA frequency weighting, respectively). Biases to the curl reconstruction are negligible. Error bars on this figure are estimated from the scatter of the unbinned power.
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