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题名: Tilting Styx and Nix but not Uranus with a Spin-Precession-Mean-motion resonance
作者: Quillen, Alice C.; Chen, Yuan-Yuan; Noyelles, Benoit; Loane, Santiago
刊名: CELESTIAL MECHANICS & DYNAMICAL ASTRONOMY
出版日期: 2018
卷号: 130, 期号:2, 页码:UNSP 11
英文摘要: A Hamiltonian model is constructed for the spin axis of a planet perturbed by a nearby planet with both planets in orbit about a star. We expand the planet-planet gravitational potential perturbation to first order in orbital inclinations and eccentricities, finding terms describing spin resonances involving the spin precession rate and the two planetary mean motions. Convergent planetary migration allows the spinning planet to be captured into spin resonance. With initial obliquity near zero, the spin resonance can lift the planet's obliquity to near 90. or 180. depending upon whether the spin resonance is first or zeroth order in inclination. Past capture of Uranus into such a spin resonance could give an alternative non-collisional scenario accounting for Uranus's high obliquity. However, we find that the time spent in spin resonance must be so long that this scenario cannot be responsible for Uranus's high obliquity. Our model can be used to study spin resonance in satellite systems. Our Hamiltonian model explains how Styx and Nix can be tilted to high obliquity via outward migration of Charon, a phenomenon previously seen in numerical simulations.
语种: 英语
WOS记录号: WOS:000426560500004
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内容类型: 期刊论文
URI标识: http://libir.pmo.ac.cn/handle/332002/18005
Appears in Collections:行星科学与深空探测实验室_期刊论文

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