Lagrange point stability for a rotating host mass binary

TL;DR

This paper investigates how the rotation of a primary mass affects the stability of Lagrange points in a relativistic three-body system, revealing that rotation enhances stability for retrograde orbits.

Contribution

It introduces the leading-order inclusion of primary mass rotation in the relativistic three-body problem, extending the understanding of Lagrange point stability.

Findings

Rotation increases stability of L_4 and L_5 for retrograde orbits.

Rotation effects are comparable to relativistic corrections.

Stability boundaries are modified by primary rotation.

Abstract

In this new era of gravitational wave astrophysics, observations have indicated the likely existence of black holes with significant spin. In order to better understand the potential imprint orbital dynamics have on the multi-messenger data, we include rotation of the primary mass to leading order in the analysis of the stability boundary pertaining to the triangular equilibrium points, L_4 and L_5, in the relativistic, restricted, circular three body problem. For Lagrange point stability these rotation effects are of the same order as the leading order relativistic corrections ignoring rotation and make both L_4 and L_5 more stable for retrograde orbital motion.