Magnetic White Dwarfs
Lilia Ferrario, Domitilla de Martino, Boris Gaensicke

TL;DR
This review summarizes current observational and theoretical understanding of magnetic white dwarfs, highlighting their magnetic field ranges, structures, origins, and presence in binary systems, with recent advances in spectropolarimetric surveys and field modeling.
Contribution
It provides a comprehensive overview of magnetic white dwarfs, emphasizing recent findings on their magnetic field strengths, structures, and potential origins, including new insights from spectropolarimetric surveys.
Findings
Magnetic fields in isolated MWDs range from 10^3 to 10^9 G.
Highly magnetic WDs often have complex, non-dipolar fields.
MWDs in binaries (MCVs) exhibit fields from 7 to 230 MG.
Abstract
In this paper we review the current status of research on the observational and theoretical characteristics of isolated and binary magnetic white dwarfs (MWDs). Magnetic fields of isolated MWDs are observed to lie in the range 10^3-10^9G. While the upper limit cutoff appears to be real, the lower limit is more difficult to investigate. The incidence of magnetism below a few 10^3G still needs to be established by sensitive spectropolarimetric surveys conducted on 8m class telescopes. Highly magnetic WDs tend to exhibit a complex and non-dipolar field structure with some objects showing the presence of higher order multipoles. There is no evidence that fields of highly magnetic WDs decay over time, which is consistent with the estimated Ohmic decay times scales of ~10^11 yrs. MWDs, as a class, also appear to be more massive than their weakly or non-magnetic counterparts. MWDs are…
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