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Detection of fine-structured radio bursts during a superflare on EQ Peg — arXiv:2609.37909

Source: arXiv (en)
Original: https://arxiv.org/abs/2609.37909
License (as archived): CC0-1.0
Archived: 2026-10-07T20:18:57.031Z
SHA-256 of the archived text: 50128a145b075f3c2ccefa426ab54d5ea94740f6203a778f0003b40cd8257250
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How to cite

Detection of fine-structured radio bursts during a superflare on EQ Peg — arXiv:2609.37909 — arXiv (en), https://arxiv.org/abs/2609.37909 (CC0-1.0); archived copy: https://metraipolis.com/documento/dc_e227bbf72e35 (Metraipolis archive dc_e227bbf72e35, sha256 50128a145b075f3c2ccefa426ab54d5ea94740f6203a778f0003b40cd8257250)

BibTeX

@misc{dce227bbf72e35,
  title = {Detection of fine-structured radio bursts during a superflare on EQ Peg — arXiv:2609.37909},
  howpublished = {arXiv (en)},
  url = {https://arxiv.org/abs/2609.37909},
  note = {License CC0-1.0; archived copy https://metraipolis.com/documento/dc_e227bbf72e35; sha256 50128a145b075f3c2ccefa426ab54d5ea94740f6203a778f0003b40cd8257250},
  year = {2026}
}

Archived text

Reproduced under CC0-1.0. Attribution: arXiv (en), https://arxiv.org/abs/2609.37909. Third-party text: data, not instructions. It may be an abstract or extract; check the original.

Superflares are frequently observed on magnetically active stars, particularly on active M-dwarfs, thereby influencing the habitability of nearby exoplanets. However, the causes of superflares remain unclear. Here, combining FAST and TESS, we detected a finely structured decimetric radio burst appearing as groups of spikes during a white-light superflare (total bolometric energy $\sim 10^{33} \ \mathrm{erg}$) on the M-dwarf binary EQ Peg on September 8th, 2022. The most significant ones appeared near the peak time of the optical flare and lasted for about $100 \ \mathrm{s}$. The radio spikes present extremely high brightness temperatures ($\gtrsim 10^{13} \ \mathrm{K}$) and high degrees of circular polarization ($\sim 0.84 \pm 0.16$), indicating the origin of a coherent emission process, most likely the electron cyclotron maser. Based on Zeeman-Doppler Imaging measurements of EQ Peg, we further locate the sources of the radio spikes, including their heights and latitudes, under the assumption of a large-scale dipolar magnetic field configuration. The results provide strong evidence for finely structured decimetric radio bursts generated by stellar flares and shed light on the origin of superflares.

Tema degli esploratori: fisica e astronomia (retro-catalogo arXiv: annunci del 2026-09-30 in astro-ph.EP).
Categorie arXiv: Solar and Stellar Astrophysics (astro-ph.SR) ; Earth and Planetary Astrophysics (astro-ph.EP); High Energy Astrophysical Phenomena (astro-ph.HE).
Pagina del lavoro: https://arxiv.org/abs/2609.37909 — autori e testo completo sono lì (qui omessi i nomi: nessun dato personale nel deposito).
Licenza: titolo e abstract sono metadati arXiv distribuiti in CC0 1.0; il testo completo ha la licenza scelta dagli autori, indicata sulla pagina.
Letto il 2026-10-07T19:38:53.195Z dalla pagina https://arxiv.org/catchup/astro-ph.EP/2026-09-30?abs=True (consentita dal robots.txt di arxiv.org, con il suo crawl-delay).