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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2026
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2601.16558 |
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| _version_ | 1866909998889566208 |
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| author | Wang, J. Xie, W. J. Cangemi, F. Coleiro, A. Li, H. L. Xu, Y. Han, X. H. Yang, H. Xin, L. P. Mao, X. Zheng, J. Jin, J. J. Li, G. W. Rodriguez, J. Tao, L. Cordier, B. Wei, J. Y. Bacon, P. Bellemont, N. Bouchet, L. Cai, H. B. Cavet, C. Dai, Z. G. Godet, O. Goldwurm, A. Guillot, S. Huang, L. Huang, M. H. Jiang, N. Liang, E. W. Lu, X. M. Schanne, S. Stum, S. Le Qiu, Y. L. Wang, X. G. Wang, X. Y. Wu, C. Zhang, L. Zhang, S. N. |
| author_facet | Wang, J. Xie, W. J. Cangemi, F. Coleiro, A. Li, H. L. Xu, Y. Han, X. H. Yang, H. Xin, L. P. Mao, X. Zheng, J. Jin, J. J. Li, G. W. Rodriguez, J. Tao, L. Cordier, B. Wei, J. Y. Bacon, P. Bellemont, N. Bouchet, L. Cai, H. B. Cavet, C. Dai, Z. G. Godet, O. Goldwurm, A. Guillot, S. Huang, L. Huang, M. H. Jiang, N. Liang, E. W. Lu, X. M. Schanne, S. Stum, S. Le Qiu, Y. L. Wang, X. G. Wang, X. Y. Wu, C. Zhang, L. Zhang, S. N. |
| contents | Detection of stellar flares at hard X-ray is still rare at the current stage. A transient was recently detected by the hard X-ray camera, ECLAIRs onboard the SVOM mission at 11:39:01.2UT on 2025, January 09. Simultaneous monitor in the optical band on the ground by SVOM/GWAC and follow-up spectroscopy enable us to confirm that the transient is caused by a superflare on HD~22468, a RS CVn-type star. The bolometric energy released in the flare is estimated to be $\sim7.2\times10^{37}-1.7\times10^{38}\ \mathrm{erg}$. The hard X-ray spectra of the event at the peak can be reproduced by the ``apec'' model of a hot plasma with a temperature of $106^{+27}_{-22}$~MK. In the optical range, the H$α$ emission-line profile obtained at $\sim1.7$ hrs after the trigger shows a bulk blueshift of $-96\pm20\ \mathrm{km\ s^{-1}}$, which can be explained by either a chromospheric evaporation or a prominence eruption. The ejected mass is estimated to be $3.9\times10^{20}$ g for the evaporating plasma, and to be $3.2\times10^{21}\ \mathrm{g}<M_{\mathrm{p}}<8.8\times10^{21}\ \mathrm{g}$ for the erupted prominence. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2601_16558 |
| institution | arXiv |
| publishDate | 2026 |
| record_format | arxiv |
| spellingShingle | Multi-wavelength Study of A Superflare on RS CVn-type Star HD22468 Triggered at Hard X-ray by SVOM Wang, J. Xie, W. J. Cangemi, F. Coleiro, A. Li, H. L. Xu, Y. Han, X. H. Yang, H. Xin, L. P. Mao, X. Zheng, J. Jin, J. J. Li, G. W. Rodriguez, J. Tao, L. Cordier, B. Wei, J. Y. Bacon, P. Bellemont, N. Bouchet, L. Cai, H. B. Cavet, C. Dai, Z. G. Godet, O. Goldwurm, A. Guillot, S. Huang, L. Huang, M. H. Jiang, N. Liang, E. W. Lu, X. M. Schanne, S. Stum, S. Le Qiu, Y. L. Wang, X. G. Wang, X. Y. Wu, C. Zhang, L. Zhang, S. N. Solar and Stellar Astrophysics High Energy Astrophysical Phenomena Detection of stellar flares at hard X-ray is still rare at the current stage. A transient was recently detected by the hard X-ray camera, ECLAIRs onboard the SVOM mission at 11:39:01.2UT on 2025, January 09. Simultaneous monitor in the optical band on the ground by SVOM/GWAC and follow-up spectroscopy enable us to confirm that the transient is caused by a superflare on HD~22468, a RS CVn-type star. The bolometric energy released in the flare is estimated to be $\sim7.2\times10^{37}-1.7\times10^{38}\ \mathrm{erg}$. The hard X-ray spectra of the event at the peak can be reproduced by the ``apec'' model of a hot plasma with a temperature of $106^{+27}_{-22}$~MK. In the optical range, the H$α$ emission-line profile obtained at $\sim1.7$ hrs after the trigger shows a bulk blueshift of $-96\pm20\ \mathrm{km\ s^{-1}}$, which can be explained by either a chromospheric evaporation or a prominence eruption. The ejected mass is estimated to be $3.9\times10^{20}$ g for the evaporating plasma, and to be $3.2\times10^{21}\ \mathrm{g}<M_{\mathrm{p}}<8.8\times10^{21}\ \mathrm{g}$ for the erupted prominence. |
| title | Multi-wavelength Study of A Superflare on RS CVn-type Star HD22468 Triggered at Hard X-ray by SVOM |
| topic | Solar and Stellar Astrophysics High Energy Astrophysical Phenomena |
| url | https://arxiv.org/abs/2601.16558 |