A targeted search for binary white dwarf pulsars using Gaia and WISE
Abstract
After its discovery in 2016, the white dwarf binary AR Scorpii (AR Sco) remained for several years the only white dwarf system to show pulsed radio emission associated with a fast-spinning white dwarf. The evolutionary origin and the emission mechanism for AR Sco are not completely understood, with different models proposed. Testing and improving these models requires observational input. Here we report the results of a targeted search for other binary white dwarf pulsars like AR Sco. Using data from Gaia and WISE, we identified 56 candidate systems with similar properties to AR Sco, of which 26 were previously uncharacterised. These were subject to spectroscopic and photometric follow-up observations. Aside from one new binary white dwarf pulsar found, J191213.72-441045.1, which was reported in a separate work, we find no other systems whose characteristics are akin to AR Sco. The newly characterised systems are primarily young stellar objects (with 10 found) or cataclysmic variables (7 identifications), with the remaining being either blended or non-variable on short timescales.
Keywords
Cite
@article{arxiv.2505.04693,
title = {A targeted search for binary white dwarf pulsars using Gaia and WISE},
author = {Ingrid Pelisoli and T. R. Marsh and G. Tovmassian and L. A. Amaral and Amornrat Aungwerojwit and M. J. Green and R. P. Ashley and David A. H. Buckley and B. T. Gaensicke and F. -J. Hambsch and K. Inight and S. B. Potter and A. J. Brown and N. Castro Segura and V. S. Dhillon and M. J. Dyer and J. A. Garbutt and D. Jarvis and M. R. Kennedy and S. O. Kepler and P. Kerry and S. P. Littlefair and J. McCormac and J. Munday and S. G. Parsons and E. Pike and D. I. Sahman},
journal= {arXiv preprint arXiv:2505.04693},
year = {2025}
}
Comments
17 pages, 21 figures. Accepted for publication in MNRAS