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High-contrast imaging studies of debris disks have revealed a significantdiversity in their morphologies, including large-scale asymmetries. Theoriesinvolving stellar flybys, an external source of gravitational disturbance, haveoffered a plausible explanation for the origin of these morphologicalvariations. Our study is an experiment to gain empirical evidence that has beenlacking from such theories. We explore this paradigm by using astrometric andradial velocity measurements from the Gaia DR2 and ground-based observations totrace the trajectories of 625 stars in the Sco-Cen OB Association from 5 Myr inthe past to 2 Myr in the future. We identified 119 stars that had at least onepast flyby event occurring within one Hill radius, and 23 of these experiencedflybys within 0.5 Hill radius. We found no evidence of a significantcorrelation between the presence of flyby events and infrared excessdetections, although the sample is not uniformly sensitive to infrared excessemission. Ten stars that had past flyby events host resolved circumstellardisks that appear relatively symmetric in the existing data except for thecircumbinary disk surrounding HD 106906. We determined the trajectory andrelative velocity of each of these flyby events, and compared these to thegeometry of the spatially-resolved disks. Future work is needed to measure thekinematics of lower mass stars and to improve sensitivity to circumstellardisks for the entire sample.

Search for Stellar Flybys in the Sco-Cen OB Association with the Gaia DR2