Characterising face-on accretion onto and the subsequent contraction of protoplanetary discs T. P. G. Wijnen, O. R. Pols, F. I. Pelupessy and S. Portegies Zwart A&A, 602 (2017) A52 Published online: 08 June 2017 DOI: 10.1051/0004-6361/201630221