The planetary capture is possible, but not likely. If 2 stars and a planet had a close encounter, its possible that the planet could be captured into a stable orbit. But if such close encounters were possible, they would be more likely to strip planets away from stars. I'm not sure of the density in GCs, (I guess I could Google it), but I'd guess that even there that close stellar encounters are not extremely common. But it only takes 1 close stellar encounter in a star's multi-billion year existance to strip away all planets it might happen to have.
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