Ejection speeds of free-floating planets from three-body systems are set mostly by the giant perturber's mass and eccentricity, with the ejected planet acting as a test particle and rare high-speed tails reaching 80 to 86 km/s for highly eccentric giants.
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Kick Velocities and Mass Function of Free-Floating Planets from Dynamical Ejection in Hierarchical Three-Body Systems
Ejection speeds of free-floating planets from three-body systems are set mostly by the giant perturber's mass and eccentricity, with the ejected planet acting as a test particle and rare high-speed tails reaching 80 to 86 km/s for highly eccentric giants.