Coherent radio bursts, polarity reversal, and quiescent emission from the M4V dwarf WW PsA
Abstract
Coherent radio emission from magnetically active M dwarfs is largely observed in two varieties: stochastic solar-like bursts and beamed, rotationally modulated emission including auroral pulses. Detailed monitoring of these stars is critical for probing the plasmas and magnetic fields driving the emission. We conducted a search for polarised radio emission from stars within 85 pc, covering 2.2×104 h of stellar dynamic spectra from the ASKAP Deep Investigation of Neutral Gas Origins (DINGO) survey. We report the discovery of coherent radio bursts from the M4V dwarf WW PsA. In addition to quiescent emission, we detect three long-duration (≳30 min) bursts, each ~100% circularly polarised, in 283.3 h of data. We also report a fourth burst in an epoch not covered by our search, detected using the VASTER pipeline. One of the bursts features a polarity reversal midway through, based on which we favour the electron cyclotron maser (ECM) mechanism over plasma emission. We tentatively propose the bursts are due to rotationally modulated ECM pulses of variable intensity. We infer the required physical properties of WW PsA, including a high obliquity β= 74+6−22 deg under an oblique rotator model.
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BibTeX
@misc{mitchellbolton2026coherent,
title = {{Coherent radio bursts, polarity reversal, and quiescent emission from the M4V dwarf WW PsA}},
author = {Jackson Mitchell-Bolton and Laura Driessen and Tara Murphy and Joshua Pritchard and Barnali Das and Richard Dodson and Martin Meyer and Jonghwan Rhee and Yuanming Wang},
howpublished = {arXiv},
year = {2026},
month = oct,
doi = {10.48550/arxiv.2610.05955},
eprint = {2610.05955},
archivePrefix = {arXiv},
url = {https://arxiv.org/abs/2610.05955},
}
RIS
TY - UNPB
TI - Coherent radio bursts, polarity reversal, and quiescent emission from the M4V dwarf WW PsA
AU - Jackson Mitchell-Bolton
AU - Laura Driessen
AU - Tara Murphy
AU - Joshua Pritchard
AU - Barnali Das
AU - Richard Dodson
AU - Martin Meyer
AU - Jonghwan Rhee
AU - Yuanming Wang
PY - 2026
DA - 2026/10/05
PB - arXiv
DO - 10.48550/arxiv.2610.05955
UR - https://arxiv.org/abs/2610.05955
AB - Coherent radio emission from magnetically active M dwarfs is largely observed in two varieties: stochastic solar-like bursts and beamed, rotationally modulated emission including auroral pulses. Detailed monitoring of these stars is critical for probing the plasmas and magnetic fields driving the emission. We conducted a search for polarised radio emission from stars within 85 pc, covering 2.2×10^4 h of stellar dynamic spectra from the ASKAP Deep Investigation of Neutral Gas Origins (DINGO) survey. We report the discovery of coherent radio bursts from the M4V dwarf WW PsA. In addition to quiescent emission, we detect three long-duration (≳30 min) bursts, each ~100% circularly polarised, in 283.3 h of data. We also report a fourth burst in an epoch not covered by our search, detected using the VASTER pipeline. One of the bursts features a polarity reversal midway through, based on which we favour the electron cyclotron maser (ECM) mechanism over plasma emission. We tentatively propose the bursts are due to rotationally modulated ECM pulses of variable intensity. We infer the required physical properties of WW PsA, including a high obliquity β= 74^+6_−22 deg under an oblique rotator model.
ER -