Hashemi, P., Shakeri, S., Wang, Y., Li, L., & Moradi, R. (2024). Multi-messenger signatures of a deformed magnetar in gamma-ray bursts. arXiv:2410.07883v1 [astro-ph.HE].
This paper investigates the possibility of a deformed magnetar acting as the central engine for gamma-ray bursts (GRBs) by studying the multi-messenger signatures, including both electromagnetic (EM) and gravitational wave (GW) emissions.
The authors model the magnetar as a Maclaurin spheroid, considering both incompressible and compressible fluids with polytropic equations of state. They derive the evolutionary equations for the magnetar's eccentricity due to angular momentum loss via EM dipole and quadrupole radiation and GW emission. The team analyzes the resulting light curves for both EM and GW emissions, examining the impact of parameters like magnetic field strength, quadrupole to dipole ratio, mass, and equation of state.
The study concludes that a deformed magnetar, as described by their model, can potentially serve as the central engine for GRBs. The model successfully explains various observed features of GRBs, including X-ray flares and the characteristics of their light curves. The authors suggest that future multi-messenger observations, particularly in the GW spectrum, could provide crucial evidence to confirm or refute this model.
This research offers a compelling model for the long-standing mystery of the central engine driving GRBs. It provides a framework for interpreting multi-messenger observations and linking them to the properties of the magnetar. The potential for detecting GW signals from these events opens up exciting possibilities for probing the physics of extremely dense matter and strong gravitational fields.
The study primarily focuses on a simplified model of a magnetar and does not incorporate all potential complexities. Future research could explore more realistic magnetar models, including magnetic field configurations, crustal effects, and interactions with the surrounding environment. Further investigation into the detectability of these signals, considering various astrophysical backgrounds and detector sensitivities, is also crucial.
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by Parisa Hashe... at arxiv.org 10-11-2024
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