A 2.9-hour periodic radio transient with an optical counterpart
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arXiv
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| Format: | Preprint |
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2024
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| author | Hurley-Walker, N. McSweeney, S. J. Bahramian, A. Rea, N. Horvath, C. Buchner, S. Williams, A. Meyers, B. W. Strader, Jay Aydi, Elias Urquhart, Ryan Chomiuk, Laura Galvin, T. J. Zelati, F. Coti Bailes, Matthew |
| author_facet | Hurley-Walker, N. McSweeney, S. J. Bahramian, A. Rea, N. Horvath, C. Buchner, S. Williams, A. Meyers, B. W. Strader, Jay Aydi, Elias Urquhart, Ryan Chomiuk, Laura Galvin, T. J. Zelati, F. Coti Bailes, Matthew |
| contents | 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. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2408_15757 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | A 2.9-hour periodic radio transient with an optical counterpart Hurley-Walker, N. McSweeney, S. J. Bahramian, A. Rea, N. Horvath, C. Buchner, S. Williams, A. Meyers, B. W. Strader, Jay Aydi, Elias Urquhart, Ryan Chomiuk, Laura Galvin, T. J. Zelati, F. Coti Bailes, Matthew Solar and Stellar Astrophysics High Energy Astrophysical Phenomena 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. |
| title | A 2.9-hour periodic radio transient with an optical counterpart |
| topic | Solar and Stellar Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2408.15757 |