Sensitivity region of a reflection study applied to the CARMENES dataset. The blue colour map shows the corrected S/N as a function of the planet’s geometric albedo as well as the velocity used for the rotational line broadening of the artificial signal. The dashed white lines indicate different corrected S/N contours, with the S/N_c = 5 contour delineating the region where a robust detection based on the CARMENES data at hand could be realised. The black dots mark grid points at which injection-recovery tests were performed. The hatched regions show where the reflection signal is expected to manifest and are defined by the upper limit on the planet’s geometric albedo (A_g < 0.14; Hooton et al. 2018) as well as the stellar rotational velocity as perceived by the planet during the CARMENES exposures (note that this v_rot region extends to higher values than shown here, but the corresponding S/N achievable using the CARMENES dataset vanishes completely). The genuine reflection signal of the planet can be assumed to be located where the two hatched regions overlap.