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| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| Subjects: | |
| Online Access: | https://arxiv.org/abs/2512.16679 |
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| _version_ | 1866908756612218880 |
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| author | Zhao, Guoying Zheng, WeiKang Shen, Rong-Feng Shui, Qingcang Li, Dongyue Zhou, Chang Zheng, Tianci Yuan, Weimin Liu, HeYang Ge, Chong Wang, Junfeng Filippenko, Alexei V. Brink, Thomas G. Forman, Jordan Gutierrez, Mayra Jones, Isabelle Kaur, Ravjit Leonhardes-Barboza, Naunet Mengistu, Petra Patel, Avi Skemer, Andrew Uppal, Anavi Wolff, Nicole Woodland, Michele N. |
| author_facet | Zhao, Guoying Zheng, WeiKang Shen, Rong-Feng Shui, Qingcang Li, Dongyue Zhou, Chang Zheng, Tianci Yuan, Weimin Liu, HeYang Ge, Chong Wang, Junfeng Filippenko, Alexei V. Brink, Thomas G. Forman, Jordan Gutierrez, Mayra Jones, Isabelle Kaur, Ravjit Leonhardes-Barboza, Naunet Mengistu, Petra Patel, Avi Skemer, Andrew Uppal, Anavi Wolff, Nicole Woodland, Michele N. |
| contents | Stellar flares are an intense stellar activity that can significantly impact the atmospheric composition of the surrounding planets and even the possible existence of life. During such events, the radiative energy of the star is primarily concentrated in the optical and X-ray bands, with the X-ray flux potentially increasing by tens or even hundreds of times. Einstein Probe (EP) detected a new X-ray transient EP J2322.1-0301 on 27 September 2024. Its spatial localization shows a high positional coincidence with the nearby high proper motion K-type star PM J23221-0301. Follow-up X-ray observations confirmed the flux enhancement of the source, while optical spectroscopic monitoring revealed time-variable features, particularly the disappearance of the H-alpha emission line. This X-ray flare is consistent with a characteristic fast-rise-exponential-decay (FRED) light curve, with a rise timescale of 1.4 ks, a decay timescale of 5.7 ks, and a total duration of about 7.1 ks. The peak luminosity in the 0.5-4.0 keV energy band reached about 1.3 x 10^31 erg s^-1, with a total energy release of about 9.1 x 10^34 erg, consistent with the empirical energy correlations observed in magnetic-reconnection-driven stellar flares, as inferred from the multitemperature plasma structure and H-alpha-X-ray energy correlation. This discovery underscores EP's capability in understanding stellar magnetic activity via observing stellar transients. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2512_16679 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | Einstein Probe Discovery of an X-ray Flare from K-type Star PM J23221-0301 Zhao, Guoying Zheng, WeiKang Shen, Rong-Feng Shui, Qingcang Li, Dongyue Zhou, Chang Zheng, Tianci Yuan, Weimin Liu, HeYang Ge, Chong Wang, Junfeng Filippenko, Alexei V. Brink, Thomas G. Forman, Jordan Gutierrez, Mayra Jones, Isabelle Kaur, Ravjit Leonhardes-Barboza, Naunet Mengistu, Petra Patel, Avi Skemer, Andrew Uppal, Anavi Wolff, Nicole Woodland, Michele N. High Energy Astrophysical Phenomena Solar and Stellar Astrophysics Stellar flares are an intense stellar activity that can significantly impact the atmospheric composition of the surrounding planets and even the possible existence of life. During such events, the radiative energy of the star is primarily concentrated in the optical and X-ray bands, with the X-ray flux potentially increasing by tens or even hundreds of times. Einstein Probe (EP) detected a new X-ray transient EP J2322.1-0301 on 27 September 2024. Its spatial localization shows a high positional coincidence with the nearby high proper motion K-type star PM J23221-0301. Follow-up X-ray observations confirmed the flux enhancement of the source, while optical spectroscopic monitoring revealed time-variable features, particularly the disappearance of the H-alpha emission line. This X-ray flare is consistent with a characteristic fast-rise-exponential-decay (FRED) light curve, with a rise timescale of 1.4 ks, a decay timescale of 5.7 ks, and a total duration of about 7.1 ks. The peak luminosity in the 0.5-4.0 keV energy band reached about 1.3 x 10^31 erg s^-1, with a total energy release of about 9.1 x 10^34 erg, consistent with the empirical energy correlations observed in magnetic-reconnection-driven stellar flares, as inferred from the multitemperature plasma structure and H-alpha-X-ray energy correlation. This discovery underscores EP's capability in understanding stellar magnetic activity via observing stellar transients. |
| title | Einstein Probe Discovery of an X-ray Flare from K-type Star PM J23221-0301 |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2512.16679 |