Subaru/SCExAO ADI observation of HD 220842 in H band (upper panel). No candidate has been resolved in this snapshot. The lower panel shows the corresponding upper limits on the companion producing the radial velocity drift of HD 220842. Detection limits at 1 and 5σ are plotted as dashed and solid lines, respectively. The mass estimate is based on BT-SETTL CIFIST2011 models (Allard et al. 2014). The contrast curve has been corrected to take self-subtraction into account. Companions above the solid line would have been detected at more than 5σ.