Radial contrast limits as a function of separation for the deepest ZIMPOL high-contrast dataset of α Cen A in the N_R filter. Panel a: 1σ and 5σ limits for thepolarised intensity as well as the 1σ photon noise limit for the polarised intensity. The basic data reduction (green line) was done without beam-shift correction and residual instrument polarisation subtraction; the complete reduction includes both steps. The diamond symbols show the improvement of the contrast limits after applying PCA-ADI. Panel b: 5σ limits for theintensity as well as the 1σ photon noise limit for the intensity. For both contrast limits – polarised intensity and intensity – we also show the corresponding contrast of our reference model planet.
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