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Recent results using radial-velocity measurements from the Gaia-ESO Surveyhave led to the discovery of multiple kinematic populations across the Vela OB2association. We present here a proper-motion study of the same region. Our aimis to test whether the radial-velocity populations have a counterpart inproper-motion space, and if so, how the two sets of kinematical data complementeach other. This work is based on parallaxes and proper motions from the TGAScatalog, as part of Gaia DR1. Two distinct proper-motion populations are founddispersed across ~5 degrees (or ~30 pc at their likely distances). Theirdetailed correspondence to the radial-velocity populations could not be tested,because of the paucity of common objects. However, compelling indications arefound that one of the new proper-motion populations consists mostly of membersof the young cluster NGC 2547, and the other is related to the gamma Velcluster. Constraints on the age of the two populations, both of which appear tobe only 10-35 Myr old, and their possible mutual interactions within the last1.5 Myrs, are discussed.

Multiple kinematical populations in Vela OB2 from Gaia DR1 data