A survey for radio emission from White Dwarfs in the VLA Sky Survey

Pelisoli, Ingrid, Chomiuk, Laura, Strader, Jay, Marsh, T. R., Aydi, Elias, Dage, Kristen C., Kyer, Rebecca, Molina, Isabella, Panurach, Teresa, Urquhart, Ryan et al.
(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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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
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:
Date
Event
June 2024
Published
16 May 2024
Available
14 May 2024
Accepted
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 open licence)
Date of first compliant deposit: 23 May 2024
Date of first compliant Open Access: 24 May 2024
RIOXX Funder/Project Grant:
Project/Grant ID
RIOXX Funder Name
Funder ID
390783311
[DFG] Deutsche Forschungsgemeinschaft
URF\R1\231496
Royal Society University Research Fellowship
UNSPECIFIED
AST-2205628
[NSF] National Science Foundation (US)
AST-2107070
[NSF] National Science Foundation (US)
AST-1751874
[NSF] National Science Foundation (US)
80NSSC23K0497
[NASA] National Aeronautics and Space Administration
UNSPECIFIED
David and Lucile Packard Foundation
101020057
[ERC] Horizon 2020 Framework Programme
ST/V000853/1
[STFC] Science and Technology Facilities Council
URI: https://wrap.warwick.ac.uk/185876/

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