Fig. 1
Virtual pericentre positions (VPPs) for a perturbed disc. The perturber has the same mass as the host and the pericentre of the parabolic, prograde orbit is at (1, 0). In a) and b) the disc is seen face on when the perturber has nearly reached pericentre and at t = tinit, respectively. In c) the VPPs of the disc particles are shown. For full description see text.
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