Modelling Magnetar Behaviour with 3D Magnetothermal Simulations

De, Grandis, D; Turolla, R; Taverna, R; Wood, TS; Zane, S

doi:10.1017/S174392132200031X

Modelling Magnetar Behaviour with 3D Magnetothermal Simulations

Lookup NU author(s): Dr Toby Wood

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Abstract

© The Author(s), 2023. Published by Cambridge University Press on behalf of International Astronomical Union.The observational properties of isolated NSs are shaped by their magnetic field and surface temperature. They evolve in a strongly coupled fashion, and modelling them is key in understanding the emission properties of NSs. Much effort was put in tackling this problem in the past but only recently a suitable 3D numerical framework was developed. We present a set of 3D simulations addressing both the long-Term evolution (≈ 104-106 yrs) and short-lived outbursts (â 1 yr). Not only a 3D approach allows one to test complex field geometries, but it is absolutely key to model magnetar outbursts, which observations associate to the appearance of small, inherently asymmetric hot regions. Even though the mechanism that triggers these phenomena is not completely understood, following the evolution of a localised heat injection in the crust serves as a model to study the unfolding of the event.