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A 2.9-hour periodic radio transient with an optical counterpart

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arxiv 2408.15757 v2 pith:KGOUE5QQ submitted 2024-08-28 astro-ph.SR astro-ph.HE

N. Hurley-Walker , S. J. McSweeney , A. Bahramian , N. Rea , C. Horvath , S. Buchner , A. Williams , B. W. Meyers
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Jay Strader Elias Aydi Ryan Urquhart Laura Chomiuk T. J. Galvin F. Coti Zelati Matthew Bailes
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keywords highradiocounterpartdiscoveredm-dwarfopticalpulsationsstar
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We present a long-period radio transient (GLEAM-X J0704-37) discovered to have an optical counterpart, consistent with a cool main sequence star of spectral type M3. The radio pulsations occur at the longest period yet found, 2.9 hours, and were discovered in archival low-frequency data from the Murchison Widefield Array (MWA). High time resolution observations from MeerKAT show that pulsations from the source display complex microstructure and high linear polarisation, suggesting a pulsar-like emission mechanism occurring due to strong, ordered magnetic fields. The timing residuals, measured over more than a decade, show tentative evidence of a ~6-yr modulation. The high Galactic latitude of the system and the M-dwarf star excludes a magnetar interpretation, suggesting a more likely M-dwarf / white dwarf binary scenario for this system.

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Cited by 4 Pith papers

Reviewed papers in the Pith corpus that reference this work. Sorted by Pith novelty score. Full citation record

  1. Low-frequency observations of low-mass binary systems with neutron star candidates

    astro-ph.HE 2025-09 conditional novelty 5.0 of 10

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    astro-ph.HE 2025-08 conditional novelty 5.0 of 10

    Ultra-long period pulsars may be Crab-like pulsars spun down by particle winds, with their radio emission powered by local magnetic reconnection instead of rotation.

  3. The Lunar Farside Transients and Technology Telescope (LFT3) Mission

    astro-ph.IM 2026-07 conditional novelty 4.0 of 10

    Proposes a $150M-class lunar farside radio telescope (LFT3) to survey 0.1–2700 MHz in the RFI-pristine shielded zone before lunar-orbital interference closes the window.

  4. Understanding the Neutron Star Population with the SKAO Telescopes

    astro-ph.HE 2026-07 accept novelty 3.5 of 10

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