Ambipolar Heating of Magnetars
Sachiko Tsuruta (1, 2), Madeline J. Kelly (1), Ken'ichi Nomoto (2),, Kanji Mori (3), Marcus Teter (1, 4), Andrew C. Liebmann (1) ((1), Department of Physics, Montana State University, (2) Kavli Institute for the, Physics, Mathematics of the Universe (WPI)
TL;DR
This paper investigates whether ambipolar diffusion in the core of magnetars can explain their observed high temperatures, using relativistic thermal models without assuming isothermality.
Contribution
It provides the first detailed relativistic thermal evolution models of magnetars considering ambipolar diffusion as a heating mechanism.
Findings
Ambipolar diffusion can account for the high temperatures of magnetars.
Models are consistent with most observed magnetar temperature data.
The study challenges previous isothermal assumptions in magnetar thermal modeling.
Abstract
Magnetars, neutron stars thought to be with ultra-strong magnetic fields of G, are observed to be much hotter than ordinary pulsars with G, and additional heating sources are required. One possibility is heating by the ambipolar diffusion in the stellar core. This scenario is examined by calculating the models using the relativistic thermal evolutionary code without making the isothermal approximation. The results show that this scenario can be consistent with most of the observed magnetar temperature data.
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Taxonomy
TopicsPulsars and Gravitational Waves Research · Geophysics and Gravity Measurements · Superconducting Materials and Applications