Seismology and diffusion of ultramassive white dwarf magnetic fields

TL;DR

This paper demonstrates that seismology can detect internal magnetic fields in ultramassive white dwarfs by analyzing their oscillation modes, providing constraints on their magnetic field strength and core composition.

Contribution

It introduces a method to constrain internal magnetic fields in ultramassive white dwarfs through seismology, linking observed oscillations to magnetic field properties and core composition.

Findings

Surface magnetic field in WD J0135+5722 is constrained to less than 2 kG.

Internal magnetic field upper limit is about 0.6 MG for CO core.

For ONe core, the magnetic field breaks out, with an upper limit around 7 kG.

Abstract

Ultramassive white dwarfs (UMWDs; defined by masses $\gtrsim 1.1\,{\rm M}_\odot$) are prime targets for seismology, because they pass through the ZZ Ceti instability strip at the same time that their cores crystallize. Recent studies suggest that crystallization may magnetize white dwarf interiors with a strong magnetic field $B_0$ up to a radius $r_{\rm out}^0$, either through a magnetic dynamo or by transporting a pre-existing fossil field. We demonstrate that seismology can probe these buried fields before they break out at the surface, because even the weak exponential tail of the outwardly diffusing field can disrupt the propagation of gravity waves near the surface. Based on the observed oscillation modes of WD J0135+5722 - the richest pulsating UMWD to date - we constrain its surface field $B_{\rm surf}\lesssim 2\,\textrm{kG}$. We solve the induction equation and translate this to an upper limit on the internal field $B_0$. For a carbon-oxygen (CO) core we find $B_{\rm surf}\ll B_0\lesssim 0.6\,\textrm{MG}$, consistent with the crystallization dynamo theory. For an oxygen-neon (ONe) core, on the the other hand, $r_{\rm out}^0$ is larger, such that the magnetic field breaks out and $B_{\rm surf}\lesssim B_0\lesssim 7\,\textrm{kG}$. This low magnetic field rules out an ONe composition or, alternatively, an intense dynamo during crystallization or merger. Either way, the imprint of magnetic fields on UMWD seismology may reveal the uncertain composition and formation paths of these stars.