HD60532, a planetary system in a 3:1 mean motion resonance

TL;DR

This paper confirms the 3:1 mean motion resonance in the HD60532 planetary system through dynamical analysis, showing the system's stability over billions of years and robustness to various orbital parameters.

Contribution

It demonstrates that the observed planetary system is indeed in a 3:1 resonance and remains stable for billions of years, with implications for planetary formation theories.

Findings

The system is in a confirmed 3:1 mean motion resonance.

The system remains stable for at least 5 billion years.

The resonance is robust across a wide range of orbital parameters.

Abstract

In a recent paper it was reported a planetary system around the star HD60532, composed by two giant planets in a possible 3:1 mean motion resonance, that should be confirmed within the next decade. Here we show that the analysis of the global dynamics of the system allows to confirm this resonance. The present best fit to data already corresponds to this resonant configuration and the system is stable for at least 5Gry. The 3:1 resonance is so robust that stability is still possible for a wide variety of orbital parameters around the best fit solution and also if the inclination of the system orbital plane with respect to the plane of the sky is as small as 15 deg. Moreover, if the inclination is taken as a free parameter in the adjustment to the observations, we find an inclination ~ 20 deg, which corresponds to M_b =3.1 M_Jup and M_c = 7.4 M_Jup for the planetary companions.