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Magnetic dynamos in white dwarfs – III : explaining the occurrence of strong magnetic fields in close double white dwarfs
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Schreiber, Matthias R., Belloni, Diogo, Zorotovic, Monica, Zapata, Sarai, Gaensicke, Boris T. and Parsons, Steven G. (2022) Magnetic dynamos in white dwarfs – III : explaining the occurrence of strong magnetic fields in close double white dwarfs. Monthly Notices of the Royal Astronomical Society, 513 (2). pp. 3090-3103. doi:10.1093/mnras/stac1076 ISSN 1745-3933.
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WRAP-magnetic-dynamos-white-dwarfs–III-explaining-occurrence-strong-magnetic-fields-close-double-white-dwarfs-Gaensicke-2022.pdf - Published Version - Requires a PDF viewer. Download (2312Kb) | Preview |
Official URL: https://doi.org/10.1093/mnras/stac1076
Abstract
The origin of strong (≳1MG) magnetic fields in white dwarfs has been a puzzle for decades. Recently, a dynamo mechanism operating in rapidly rotating and crystallizing white dwarfs has been suggested to explain the occurrence rates of strong magnetic fields in white dwarfs with close low-mass main sequence star companions. Here we investigate whether the same mechanism may produce strong magnetic fields in close double white dwarfs. The only known strongly magnetic white dwarf that is part of a close double white dwarf system, the magnetic component of NLTT 12758, is rapidly rotating and likely crystallizing and therefore the proposed dynamo mechanism represents an excellent scenario for the origin of its magnetic field. Presenting a revised formation scenario for NLTT 12758, we find a natural explanation for the rapid rotation of the magnetic component. We furthermore show that it is not surprising that strong magnetic fields have not been detected in all other known double white dwarfs. We therefore conclude that the incidence of magnetic fields in close double white dwarfs supports the idea that a rotation and crystallization driven dynamo plays a major role in the generation of strong magnetic fields in white dwarfs.
| Item Type: | Journal Article | |||||||||||||||
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| Subjects: | Q Science > QB Astronomy | |||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | |||||||||||||||
| SWORD Depositor: | Library Publications Router | |||||||||||||||
| Library of Congress Subject Headings (LCSH): | White dwarf stars -- Magnetic properties, Extrasolar planets, Double stars, Astrophysics | |||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | |||||||||||||||
| Publisher: | Oxford University Press | |||||||||||||||
| ISSN: | 1745-3933 | |||||||||||||||
| Official Date: | June 2022 | |||||||||||||||
| Dates: |
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| Volume: | 513 | |||||||||||||||
| Number: | 2 | |||||||||||||||
| Page Range: | pp. 3090-3103 | |||||||||||||||
| DOI: | 10.1093/mnras/stac1076 | |||||||||||||||
| Status: | Peer Reviewed | |||||||||||||||
| Publication Status: | Published | |||||||||||||||
| Access rights to Published version: | Restricted or Subscription Access | |||||||||||||||
| Date of first compliant deposit: | 31 May 2022 | |||||||||||||||
| Date of first compliant Open Access: | 1 June 2022 | |||||||||||||||
| RIOXX Funder/Project Grant: |
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