Spinorbit coupling and chaotic rotation for circumbinary bodies. Application to the small satellites of the PlutoCharon system
Abstract
We investigate the resonant rotation of circumbinary bodies in planar quasicircular orbits. Denoting n_{b} and n the orbital mean motion of the inner binary and of the circumbinary body, respectively, we show that spinorbit resonances exist at the frequencies n ± kν/2, where ν = n_{b}  n, and k is an integer. Moreover, when the libration at natural frequency has the same magnitude as ν, the resonances overlap and the rotation becomes chaotic. We apply these results to the small satellites in the PlutoCharon 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
 Publication:

Astronomy and Astrophysics
 Pub Date:
 August 2015
 DOI:
 10.1051/00046361/201526800
 arXiv:
 arXiv:1506.06733
 Bibcode:
 2015A&A...580L..14C
 Keywords:

 planetary systems;
 planets and satellites: dynamical evolution and stability;
 planets and satellites: individual: Pluto;
 planets and satellites: individual: Charon;
 celestial mechanics;
 Astrophysics  Earth and Planetary Astrophysics;
 Nonlinear Sciences  Chaotic Dynamics;
 Physics  Space Physics
 EPrint:
 7 pages, 4 figures