Tidal evolution of the Pluto-Charon binary

Abstract

A giant collision is believed to be at the origin of the Pluto-Charon system. As a result, the initial orbit and spins after impact may have substantially differed from those observed today. More precisely, the distance at periapse may have been shorter, subsequently expanding to its current separation by tides raised simultaneously on the two bodies. Here we provide a general 3D model to study the tidal evolution of a binary composed of two triaxial bodies orbiting a central star. We apply this model to the Pluto-Charon binary, and notice some interesting constraints on the initial system. We observe that when the eccentricity evolves to high values, the presence of the Sun prevents Charon from escaping because of Lidov-Kozai cycles. However, for a high initial obliquity for Pluto or a spin-orbit capture of Charon's rotation, the binary eccentricity is damped very efficiently. As a result, the system can maintain a moderate eccentricity throughout its evolution, even for strong tidal dissipation on Pluto.

14 pages, 10 figures

References in corpus (18)

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Cited by in corpus (5)

• Past and present dynamics of the circumbinary moons in the Pluto-Charon system
• A Pluto--Charon Concerto II. Formation of a Circumbinary Disk of Debris After the Giant Impact
• Initial conditions for tidal synchronisation of a planet by its moon
• Synchronisation of a tidal binary by inward orbital migration. The case of Pluto and Charon
• Tidal evolution of the eccentric moon around dwarf planet (225088) Gonggong