Neutrino Emissivities as a Probe of the Internal Magnetic Fields of White Dwarfs

Drewes, Marco; McDonald, Jamie; Sablon, Loïc; Vitagliano, Edoardo

doi:10.3847/1538-4357/ac7874

Title: Neutrino Emissivities as a Probe of the Internal Magnetic Fields of White Dwarfs

Journal Article · 27 July 2022 · The Astrophysical Journal

DOI: https://doi.org/10.3847/1538-4357/ac7874 · OSTI ID:1878661

;

; Sablon, Loïc;

Abstract The evolution of white dwarfs (WDs) depends crucially on thermal processes. The plasma in their core can produce neutrinos that escape from the star, thus contributing to the energy loss. While in the absence of a magnetic field the main cooling mechanism is plasmon decay at high temperature and photon surface emission at low temperature, a large magnetic field in the core hiding beneath the surface even of ordinary WDs, and undetectable to spectropolarimetric measurements, could potentially leave an imprint in the cooling. In this paper, we revisit the contribution to WD cooling stemming from neutrino pair synchrotron radiation and the effects of the magnetic field on plasmon decay. Our key finding is that even if observations limit the magnetic field strength at the stellar surface, magnetic fields in the interior of WDs—with or without a surface magnetic field—can be strong enough to modify the cooling rate, with neutrino pair synchrotron emission being the most important contribution. This effect may not only be relevant for the quantification and interpretation of cooling anomalies, but suggests that the internal magnetic fields of WDs should be smaller than ∼ 6 × 10 ¹¹ G, slightly improving bounds coming from a stability requirement. While our simplified treatment of the WD structure implies that further studies are needed to reduce the systematic uncertainties, the estimates based on comparing the emissivities illustrate the potential of neutrino emission as a diagnostic tool to study the interior of WDs.

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Research Organization:: University of California, Los Angeles, CA (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC); USDOE Office of Science (SC), High Energy Physics (HEP)

Grant/Contract Number:: SC0009937

OSTI ID:: 1878661

Journal Information:: The Astrophysical Journal, Journal Name: The Astrophysical Journal Journal Issue: 2 Vol. 934; ISSN 0004-637X

Publisher:: American Astronomical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Neutrino Emissivities as a Probe of the Internal Magnetic Fields of White Dwarfs

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