Giacomo Lari

Dipartimento di Matematica, Università di Pisa

On the long-term orbital evolution of Callisto in different tidal scenarios

The current configuration of the Galilean satellites provides a chain of mean motion resonances, known as Laplace resonance, that involves the three inner moons (Io, Europa and Ganymede) but not Callisto. Moreover, Galilean satellites’ dynamics is strongly influenced by the tidal dissipation in the Jovian system that produces important variations in their semi-major axes over large timescales. We present recent results about the long-term evolution of Callisto and the other Galilean satellites in two different tidal scenarios. In the first one (classic tidal scenario), Callisto undergoes very small tidal migration because of its large distance from Jupiter, while the three inner moons expand outwards. In this case, we show that Galilean satellites will form a 4-body 8:4:2:1 resonant chain in about 1.5 Gyrs from now. In the second one (resonance locking scenario), Callisto migrates very fast because of high dissipation within Jupiter at the satellite’s frequency. In this case, we show that Callisto recently crossed the 2:1 resonant region with Ganymede and affected greatly the dynamics of the three inner moons. We then investigate if such an evolution is compatible with the current configuration of the system.

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On the long-term orbital evolution of Callisto in different tidal scenarios
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