Dynamical Analysis of the 3:1 Resonance in the upsilon-Andromedae System

TL;DR

This paper investigates the dynamical behavior of the upsilon-Andromedae planetary system, focusing on the 3:1 mean motion resonance and its stability over hundreds of millions of years through numerical simulations.

Contribution

It provides the first detailed analysis of the 3:1 resonance between upsilon-Andromedae-d and e, confirming multiple apsidal resonances and long-term stability of the system.

Findings

Upsilon-Andromedae-d and e are in an apsidal resonance.

The system is in a stability island in the parameter space.

Numerical integrations show the system remains stable for 500 million years.

Abstract

We study the dynamics of the upsilon-Andromedae planetary system proposed by Curiel et al. (2011). We focus on the study of the 3:1 Mean Motion Resonance between upsilon-Andromedae-d and the recently discovered upsilon-Andromedae-e (hereafter upsilon-And-d and upsilon-And-e). Numerical simulations of the dynamics of the four planet system are conducted. The previously reported apsidal resonance between upsilon-And-c and upsilon-And-d is confirmed. In addition, we find that upsilon-And-d and upsilon-And-e are also in an apsidal resonance condition. Our results further indicate that the upsilon-Andromedae planetary system configuration is in the middle of a stability island in the semimajor axis-eccentricity domain. Additionally, we performed numerical integrations of the planetary configuration over 500 Myr and found it to be stable. We conclude that, within the uncertainties in the value of the orbital parameters, it is likely that upsilon-Andromedae planetary system will remain stable for a long timescale.