Fig. 1

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Schematic diagram of the jumping-Jupiter evolution due to the invasion of a FFP in the co-planar model. Jupiter is initially on a circular orbit (solid circle) around the Sun, with phase angle θ measured anticlockwise from the positive x-axis. The FFP is approaching the Sun-Jupiter system on a parabolic orbit with initial coordinates (, −d) (d > 0). After the close encounter near the FFP’s perihelion on the positive x-axis, Jupiter has its motion accelerated and its orbit expanded accordingly (dashed circle), while the FFP leaves the Solar System.
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