The properties and origin of magnetic fields in white dwarfs
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A significant fraction of white dwarfs harbour a magnetic field with strengths ranging from a few kG up to about 1000 MG. The fraction appears to depend on the specific class of white dwarfs being investigated and may hold some clues to the origin of their magnetic field. The number of white dwarfs with variable fields as a function of their rotation phase have revealed a large field structure diversity, from a simple offset dipole to structures with spots or multipoles. A review of the current challenges in modelling white dwarf atmospheres in the presence of a magnetic field is presented, and the proposed scenarios for the formation of magnetic fields in white dwarfs are examined.
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A fast spinning magnetic white dwarf in the double degenerate, super-Chandrasekhar system NLTT 12758Kawka, Adéla; Briggs, G.; Vennes, S.; Ferrario, L.; Paunzen, E.; Wickramasinghe, D. (2017)We present an analysis of the close double degenerate NLTT 12758, which is comprised of a magnetic white dwarf with a field of about 3.1 MG and an apparently non-magnetic white dwarf. We measured an orbital period of 1.154 ...
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