SPHERE measurements (in blue) of the offset positions of the companion candidates relative to their primary stars. For each diagram, if the candidate is a stationary background object, the expected variation of offset positions is shown (solidline). This is based on a distance and on a primary proper motion, as well as the initial offset position of the candidate relative to the primary. The predicted offset positions of a stationary background object for the second epoch is shown in red with uncertainties. For HIP117452, measurements of both components Ba and Bb at various epochs are plotted in dark and light blue, respectively.