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A common origin of magnetism from planets to white dwarfs

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10.3847/2041-8213/aa5eae
 
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hdl:2117/104213

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Isern Vilaboy, Jordi
García-Berro Montilla, EnriqueMés informació
Kulebi, Baybar
Lorén Aguilar, Pablo
Document typeArticle
Defense date2017-02-20
Rights accessOpen Access
Attribution-NonCommercial-NoDerivs 3.0 Spain
This work is protected by the corresponding intellectual and industrial property rights. Except where otherwise noted, its contents are licensed under a Creative Commons license : Attribution-NonCommercial-NoDerivs 3.0 Spain
ProjectDESARROLLO Y EXPLOTACION DE LA MISION LISA PATHFINDER Y CONTRIBUCIONES AL UNIVERSO GRAVITATORIO Y STE-QUEST (MINECO-ESP2013-47637-P)
EXPLOSIONES ESTELARES Y SUS ESCENARIOS EN ALTAS ENERGIAS: MODELOS, OBSERVACIONES Y TECNOLOGIA (MINECO-ESP2015-66134-R)
SIMULACIONES MULTIDIMENSIONALES DE NOVAS Y SUPERNOVAS IA (MINECO-AYA2014-59084-P)
SIMULACIONES MULTIDIMENSIONALES DE NOVAS Y SUPERNOVAS IA (MINECO-AYA2014-59084-P)
Abstract
Isolated magnetic white dwarfs have field strengths ranging from kilogauss to gigagauss. However, the origin of the magnetic field has not been hitherto elucidated. Whether these fields are fossil, hence the remnants of original weak magnetic fields amplified during the course of the evolution of their progenitor stars, or are the result of binary interactions, or, finally, they are produced by other internal physical mechanisms during the cooling of the white dwarf itself, remains a mystery. At sufficiently low temperatures, white dwarfs crystallize. Upon solidification, phase separation of its main constituents, 12C and 16O, and of the impurities left by previous evolution occurs. This process leads to the formation of a Rayleigh–Taylor unstable liquid mantle on top of a solid core. This convective region, as it occurs in solar system planets like the Earth and Jupiter, can produce a dynamo able to yield magnetic fields of strengths of up to 0.1 MG, thus providing a mechanism that could explain magnetism in single white dwarfs.
CitationIsern, J., Garcia-berro, E., Kulebi, B., Loren, P. A common origin of magnetism from planets to white dwarfs. "Astrophysical Journal Letters", 20 Febrer 2017, vol. 836, núm. L28, p. 1-5. 
URIhttp://hdl.handle.net/2117/104213
DOI10.3847/2041-8213/aa5eae
ISSN2041-8213
Publisher versionhttp://iopscience.iop.org/article/10.3847/2041-8213/aa5eae
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