Magnetism among the oldest white dwarfs in the solar neighbourhood
Abstract
We present a new circular polarisation survey of approximately 100 white dwarfs selected as featureless DC stars and combine our measurements with previous observations. Our compilation contains 205 objects, of which 24 show firm circular polarisation detections, while another four show marginal signals that require confirmation. Four magnetic white dwarfs originally classified as DC show polarisation spectra with significant contributions from spectral lines. Depending on the treatment of these objects and of the marginal detections, the inferred fraction of magnetic objects in the DC selected sample lies between approximately 10 and 14%. Among objects without identifiable line contributions, the circular polarisation never exceeds approximately 2%, substantially below the levels observed in some hotter magnetic white dwarfs with prominent spectral features. This is unlikely a symptom of field decay, since in our sample we find no significant evidence for a dependence of magnetic incidence on cooling age, and magnetic fields are detected in stars with cooling ages exceeding 9 Gyr. Instead, strong spectral line opacity provides a natural mechanism for producing much larger polarisation amplitudes than the continuum. In the full sample considered here, the incidence of detectable magnetism increases with stellar mass. Most average-mass magnetic stars for which repeated observations are available show no clear polarimetric variability, whereas variability appears more common among the most massive objects.
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BibTeX
@misc{bagnulo2026magnetism,
title = {{Magnetism among the oldest white dwarfs in the solar neighbourhood}},
author = {Stefano Bagnulo and John D. Landstreet},
howpublished = {arXiv},
year = {2026},
month = nov,
doi = {10.48550/arxiv.2611.06548},
eprint = {2611.06548},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2611.06548},
note = {CC BY 4.0},
}
RIS
TY - UNPB
TI - Magnetism among the oldest white dwarfs in the solar neighbourhood
AU - Stefano Bagnulo
AU - John D. Landstreet
PY - 2026
DA - 2026/11/04
PB - arXiv
DO - 10.48550/arxiv.2611.06548
UR - https://arxiv.org/abs/2611.06548
AB - We present a new circular polarisation survey of approximately 100 white dwarfs selected as featureless DC stars and combine our measurements with previous observations. Our compilation contains 205 objects, of which 24 show firm circular polarisation detections, while another four show marginal signals that require confirmation. Four magnetic white dwarfs originally classified as DC show polarisation spectra with significant contributions from spectral lines. Depending on the treatment of these objects and of the marginal detections, the inferred fraction of magnetic objects in the DC selected sample lies between approximately 10 and 14%. Among objects without identifiable line contributions, the circular polarisation never exceeds approximately 2%, substantially below the levels observed in some hotter magnetic white dwarfs with prominent spectral features. This is unlikely a symptom of field decay, since in our sample we find no significant evidence for a dependence of magnetic incidence on cooling age, and magnetic fields are detected in stars with cooling ages exceeding 9 Gyr. Instead, strong spectral line opacity provides a natural mechanism for producing much larger polarisation amplitudes than the continuum. In the full sample considered here, the incidence of detectable magnetism increases with stellar mass. Most average-mass magnetic stars for which repeated observations are available show no clear polarimetric variability, whereas variability appears more common among the most massive objects.
ER -