Appearance of the prolate and the toroidal magnetic field dominated stars - Analytic approach

Abstract

We have analyzed magnetized equilibrium states and showed a condition for appearance of the prolate and the toroidal magnetic field dominated stars by analytic approaches. Both observations and numerical stability analysis support that the magnetized star would have the prolate and the large internal toroidal magnetic fields. In this context, many investigations concerning magnetized equilibrium states have tried to obtain the prolate and the toroidal dominant solutions, but many of them have failed to obtain such configurations. Since the Lorentz force is a cross product of current density and magnetic field, the prolate shaped configurations and the large toroidal magnetic fields in stars require a special relation between current density and the Lorentz force. We have analyzed simple analytical solutions and found that the prolate and the toroidal dominant configuration require non force-free toroidal current density that flows in the opposite direction with respect to the bulk current within the star. Such current density results in the Lorentz force which makes the stellar shape prolate. Satisfying this special relation between the current density and the Lorentz force is a key for appearance of the prolate and the toroidal magnetic field dominated magnetized star.

arXiv comment13 pages, 5 figures, accepted for publication in Publications of the Astronomical Society of Japan (PASJ)

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