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A survey for radio emission from White Dwarfs in the VLA Sky Survey
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(2024) A survey for radio emission from White Dwarfs in the VLA Sky Survey. Monthly Notices of the Royal Astronomical Society, 531 (1). pp. 1805-1822. doi:10.1093/mnras/stae1275 ISSN 1745-3933.
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Official URL: http://dx.doi.org/10.1093/mnras/stae1275
Abstract
Radio emission has been detected from tens of white dwarfs, in particular in accreting systems. Additionally, radio emission has been predicted as a possible outcome of a planetary system around a white dwarf. We searched for 3 GHz radio continuum emission in 846,000 candidate white dwarfs previously identified in Gaia using the Very Large Array Sky Survey (VLASS) Epoch 1 Quick Look Catalogue. We identified 13 candidate white dwarfs with a counterpart in VLASS within 2″. Five of those were found not to be white dwarfs in follow-up or archival spectroscopy, whereas seven others were found to be chance alignments with a background source in higher-resolution optical or radio images. The remaining source, WDJ204259.71+152108.06, is found to be a white dwarf and M-dwarf binary with an orbital period of 4.1 days and long-term stochastic optical variability, as well as luminous radio and X-ray emission. For this binary, we find no direct evidence of a background contaminant, and a chance alignment probability of only ≈2 per cent. However, other evidence points to the possibility of an unfortunate chance alignment with a background radio and X-ray emitting quasar, including an unusually poor Gaia DR3 astrometric solution for this source. With at most one possible radio emitting white dwarf found, we conclude that strong (≳ 1 − 3 mJy) radio emission from white dwarfs in the 3 GHz band is virtually nonexistent outside of interacting binaries.
| Item Type: | Journal Article | ||||||||||||||||||||||||||||||
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| Subjects: | Q Science > QB Astronomy | ||||||||||||||||||||||||||||||
| Divisions: | Faculty of Science, Engineering and Medicine > Science > Physics | ||||||||||||||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | White dwarf stars, Radio astrophysics, Radio sources (Astronomy) | ||||||||||||||||||||||||||||||
| Journal or Publication Title: | Monthly Notices of the Royal Astronomical Society | ||||||||||||||||||||||||||||||
| Publisher: | Oxford University Press | ||||||||||||||||||||||||||||||
| ISSN: | 1745-3933 | ||||||||||||||||||||||||||||||
| Official Date: | June 2024 | ||||||||||||||||||||||||||||||
| Dates: |
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| Volume: | 531 | ||||||||||||||||||||||||||||||
| Number: | 1 | ||||||||||||||||||||||||||||||
| Page Range: | pp. 1805-1822 | ||||||||||||||||||||||||||||||
| DOI: | 10.1093/mnras/stae1275 | ||||||||||||||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||||||||||||||
| Date of first compliant deposit: | 23 May 2024 | ||||||||||||||||||||||||||||||
| Date of first compliant Open Access: | 24 May 2024 | ||||||||||||||||||||||||||||||
| RIOXX Funder/Project Grant: |
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