Nonlinear Coupling between Magnetar QPOs

Tools

Pnigouras, P. and Lander, S. K. (2025) Nonlinear Coupling between Magnetar QPOs. Astrophysical Journal, 987 (1). ISSN 0004-637X

[thumbnail of rba03-Nonlinear_Coupling_betwee] Microsoft Word (rba03-Nonlinear_Coupling_betwee) - Published Version
Available under License Creative Commons Attribution.
Download (1MB)

Abstract

The quasiperiodic oscillations (QPOs) observed in the tails of magnetar giant γ-ray flares have long been interpreted as normal oscillation modes of these stars. However, most studies modeling QPOs have neglected some key features in the analyses of the signals, namely that QPOs appear to be detectable only intermittently and exhibit drifts in their frequencies. These are typical characteristics of nonlinear mode coupling, where, at leading order, the modes couple and evolve collectively as triplets. Using a representative triplet of modes, we solve the system’s nonlinear equations of motion analytically and argue that the coupling is likely axial-axial-polar in nature, with the observed intermittence and frequency drifts providing a way to infer details of the magnetar’s internal magnetic field geometry.

Item Type: Article
Additional Information: Publisher Copyright: © 2025. The Author(s). Published by the American Astronomical Society.
Uncontrolled Keywords: astronomy and astrophysics,space and planetary science ,/dk/atira/pure/subjectarea/asjc/3100/3103
Faculty \ School: Faculty of Science > School of Engineering, Mathematics and Physics
Related URLs:
Depositing User: LivePure Connector
Date Deposited: 09 Feb 2026 14:36
Last Modified: 09 Feb 2026 14:36
URI: https://ueaeprints.uea.ac.uk/id/eprint/101872
DOI: 10.3847/1538-4357/adceee

Downloads

Downloads per month over past year

Actions (login required)

View Item View Item