Initial Configuration
In the SLy cases, the stars are initially seeded with a dynamically weak, dipolar B-field generated by the vector potential $A_\phi$, which approximates the vector potential of a current loop. We choose the current and radius of the loop such that, in the interior, the maximum value of the ratio of magnetic to gas pressure is $\beta^{-1} = 0.003125$, which is dynamically weak and does not affect the early evolution. The field in the exterior magnetosphere is strong, with $\beta^{-1} = 100$, and mimics the force-free conditions likely characterizing such a region.
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