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Planetary systems appear to form contemporaneously around young stars withinyoung star-forming regions. Within these environments, the chances of survival,as well as the long-term evolution of these systems, are influenced by factorssuch as dynamical interactions with other stars and photoevaporation frommassive stars. These interactions can also cause young stars to be ejected fromtheir birth regions and become runaways. We present examples of such runawaystars in the vicinity of the Orion Nebula Cluster (ONC) found in Gaia DR2 datathat have retained their discs during the ejection process. Once set on theirpath, these runaways usually do not encounter any other dense regions thatcould endanger the survival of their discs or young planetary systems. However,we show that it is possible for star-disc systems, presumably ejected from onedense star-forming region, to encounter a second dense region, in our case theONC. While the interactions of the ejected star-disc systems in the secondregion are unlikely to be the same as in their birth region, a second encounterwill increase the risk to the disc or planetary system from malign externaleffects.

Double trouble: Gaia reveals (proto)-planetary systems that may experience more than one dense star-forming environment