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Title:
Spin-orbit coupling and chaotic rotation for circumbinary bodies. Application to the small satellites of the Pluto-Charon system
Authors:
Correia, Alexandre C. M.; Leleu, Adrien; Rambaux, Nicolas; Robutel, Philippe
Affiliation:
AA(CIDMA, Departamento de FísicaUniversidade de Aveiro, Campus de Santiago, 3810-193, Aveiro, Portugal ; ASD, IMCCE-CNRS UMR8028, Observatoire de Paris, UPMC, 77 Av. Denfert-Rochereau, 75014, Paris, France), AB(ASD, IMCCE-CNRS UMR8028, Observatoire de Paris, UPMC, 77 Av. Denfert-Rochereau, 75014, Paris, France), AC(ASD, IMCCE-CNRS UMR8028, Observatoire de Paris, UPMC, 77 Av. Denfert-Rochereau, 75014, Paris, France; Université Pierre et Marie Curie, UPMC -, Paris 06, France), AD(ASD, IMCCE-CNRS UMR8028, Observatoire de Paris, UPMC, 77 Av. Denfert-Rochereau, 75014, Paris, France)
Publication:
Astronomy & Astrophysics, Volume 580, id.L14, 7 pp. (A&A Homepage)
Publication Date:
08/2015
Origin:
EDP Sciences
Astronomy Keywords:
planetary systems, planets and satellites: dynamical evolution and stability, planets and satellites: individual: Pluto, planets and satellites: individual: Charon, celestial mechanics
DOI:
10.1051/0004-6361/201526800
Bibliographic Code:
2015A&A...580L..14C

Abstract

We investigate the resonant rotation of circumbinary bodies in planar quasi-circular orbits. Denoting nb and n the orbital mean motion of the inner binary and of the circumbinary body, respectively, we show that spin-orbit resonances exist at the frequencies n ± knu/2, where nu = nb - n, and k is an integer. Moreover, when the libration at natural frequency has the same magnitude as nu, the resonances overlap and the rotation becomes chaotic. We apply these results to the small satellites in the Pluto-Charon system, and conclude that their rotations are likely chaotic. However, the rotation can also be stable and not synchronous for small axial asymmetries.

Figure 4 and Appendices are available in electronic form at http://www.aanda.org

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