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The discovery of 'Oumuamua (1I/2017 U1), the first interstellar interloper,suggests an abundance of free-floating small bodies whose ejection intogalactic space cannot be explained by the current population of confirmedexoplanets. Shortly after 'Oumuamua's discovery, observational results from theDSHARP survey illustrated the near-ubiquity of ring/gap substructures withinprotoplanetary disks, strongly suggesting the existence of a vast population ofas-yet undetected wide-separation planets that are capable of efficientlyejecting debris from their environments. These planets have $a \gtrsim 5$ auand masses of order Neptune's or larger, and they may accompany $\sim$50% ofnewly formed stars (Zhang et al. 2018). We combine the DSHARP results withstatistical constraints from current time-domain surveys to quantify thepopulation of detectable icy planetesimals ejected by disk-embedded giantplanets through gravity assists. Assessment of the expected statisticaldistribution of interstellar objects is critical to accurately plan for andinterpret future detections. We show that the number density of interstellarobjects implied by 'Oumuamua is consistent with 'Oumuamua itself havingoriginated as an icy planetesimal ejected from a DSHARP-type system via gravityassists, with the caveat that 'Oumuamua's lack of observed outgassing remainsin strong tension with a cometary origin. Under this interpretation,'Oumuamua's detection points towards a large number of long-period giantplanets in extrasolar systems, supporting the hypothesis that the observed gapsin protoplanetary disks are carved by planets. In the case that 'Oumuamua is anejected cometary planetesimal, we conclude that LSST should detect up to a fewinterstellar objects per year of 'Oumuamua's size or larger and over 100yr$^{-1}$ for objects with $r > 1\,{\rm m}$.

Hidden Planets: Implications from 'Oumuamua and DSHARP