Three dimensional structure of mean motion resonances beyond Neptune

TL;DR

This paper introduces a semianalytical method to analyze the structure of mean motion resonances beyond Neptune, providing detailed resonance maps and insights into their widths, fragility, and population distributions in the trans-Neptunian region.

Contribution

It develops a novel semianalytical approach for calculating resonance characteristics applicable to arbitrary eccentricities and inclinations, and applies it to the trans-Neptunian region to map resonance domains.

Findings

Resonance widths vary significantly with argument of perihelion.

1:k and 2:k resonances are the most prominent and least fragile.

Resonant populations tend to cluster near wider, less fragile resonance regions.

Abstract

We propose a semianalytical method for the calculation of widths, libration centers and small amplitude libration periods of the mean motion resonances k_p:k in the framework of the circular restricted three body problem valid for arbitrary eccentricities and inclinations. Applying the model to the trans Neptunian region (TNR) we obtain several atlas of resonances between 30 and 100 au showing their domain in the plane (a,e) for different orbital inclinations. The resonance width may change substantially when varying the argument of the perihelion of the resonant object and in order to take into account these variations we introduce the concept of resonance fragility. Resonances 1:k and 2:k are the widest, strongest, most isolated ones and with lower fragility for all interval of inclinations and eccentricities. We discuss about the existence of high k_p:k resonances. We analyze the distribution of the resonant populations inside resonances 1:1, 2:3, 3:5, 4:7, 1:2 and 2:5. We found that the populations are in general located near the regions of the space (e,i) where the resonances are wider and less fragile with the notable exception of the population inside the resonance 4:7 and in a lesser extent the population inside 3:5 which are shifted to lower eccentricities.