Affiliation:
1. School of Astronomy and Space Science, Nanjing University, Nanjing 210023, China
2. Key Laboratory of Modern Astronomy and Astrophysics in Ministry of Education, Nanjing University, Nanjing 210023, China
Abstract
ABSTRACT
In this work, two multiharmonic Hamiltonian models for mean motion resonances are formulated and their applications to first-order resonances are discussed. For the kp:k resonance, the usual critical argument φ = kλ − kpλp + (kp − k)ϖ is taken as the resonant angle in the first model, while the second model is characterized by a new critical argument σ = φ/kp. Based on canonical transformations, the resonant Hamiltonians associated with these two models are formulated. It is found that the second Hamiltonian model holds two advantages in comparison with the first model: (i) providing a direct correspondence between phase portraits and Poincaré sections, and (ii) presenting new phase-space structures where the zero-eccentricity point is a visible saddle point. Then, the second Hamiltonian model is applied to the first-order inner and outer resonances, including the 2:1, 3:2, 4:3, 2:3, and 3:4 resonances. The phase-space structures of these first-order resonances are discussed in detail and then the libration centres and associated resonant widths are identified analytically. Simulation results show that there are pericentric and apocentric libration zones where the libration centres diverge away from the nominal resonance location as the eccentricity approaches zero and, in particular, the resonance separatrices do not vanish at arbitrary eccentricities for both the inner and outer (first-order) resonances.
Funder
National Natural Science Foundation of China
National Key Research and Development Program of China
Publisher
Oxford University Press (OUP)
Subject
Space and Planetary Science,Astronomy and Astrophysics
Cited by
5 articles.
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