Left: astrometric analysis of the candidate companion proper motion between 2005 and 2008, using NICMOS and NACO. Right: astrometric analysis of the candidate companion proper motion between 2008 and 2011 (and the marginal Lp-band detection of 2010), using NACO only. The continuous line represents the combined parallactic motion and the proper motion of the background object in the reference frame of the primary target. The filled dots represent the positions of the candidate companion with error bars at the different epochs while the empty dots (“IF BKGD”) represent the positions of a putative background object at the same epochs.