LEIA discovery of the longest-lasting and most energetic stellar X-ray flare ever detected
Fuente:
arXiv
Saved in:
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , , |
|---|---|
| Format: | Preprint |
| Published: |
2024
|
| Subjects: | |
| Online Access: | |
| Tags: |
Add Tag
No Tags, Be the first to tag this record!
|
| _version_ | 1866909502710743040 |
|---|---|
| author | Mao, Xuan Liu, He-Yang Wang, Song Ling, Zhixing Yuan, Weimin Cheng, Huaqing Pan, Haiwu Li, Dongyue Favata, Fabio Ji, Tuo Zhang, Jujia Zhao, Xinlin Wan, Jing Cai, Zhiming Castro-Tirado, Alberto J. Dai, Yanfeng Deng, Licai Ding, Xu Ji, Kaifan Jin, Chichuan Lei, Yajuan Li, Huali Lin, Jun Liu, Huaqiu Liu, Mingjun Liu, Shuai Liu, Yuan Sun, Hui Sun, Shengli Sun, Xiaojin Shi, Jianrong Wang, Jianguo Wang, Jingxiu Wang, Wenxin Wei, Jianyan Xin, Liping Xiong, Dingrong Zhang, Chen Zhang, Wenda Zhang, Yonghe Zhang, Xiaofeng Zhao, Donghua Zhou, Guiping |
| author_facet | Mao, Xuan Liu, He-Yang Wang, Song Ling, Zhixing Yuan, Weimin Cheng, Huaqing Pan, Haiwu Li, Dongyue Favata, Fabio Ji, Tuo Zhang, Jujia Zhao, Xinlin Wan, Jing Cai, Zhiming Castro-Tirado, Alberto J. Dai, Yanfeng Deng, Licai Ding, Xu Ji, Kaifan Jin, Chichuan Lei, Yajuan Li, Huali Lin, Jun Liu, Huaqiu Liu, Mingjun Liu, Shuai Liu, Yuan Sun, Hui Sun, Shengli Sun, Xiaojin Shi, Jianrong Wang, Jianguo Wang, Jingxiu Wang, Wenxin Wei, Jianyan Xin, Liping Xiong, Dingrong Zhang, Chen Zhang, Wenda Zhang, Yonghe Zhang, Xiaofeng Zhao, Donghua Zhou, Guiping |
| contents | The Lobster Eye Imager for Astronomy (LEIA) detected a new X-ray transient on 2022 November 7, identified as a superflare event occurring on a nearby K-type giant star HD 251108. The flux increase was also detected in follow-up observations at X-ray, UV and optical wavelengths. The flare lasted for about 40 days in soft X-ray observations, reaching a peak luminosity of ~1.1 * 10^34 erg/s in 0.5-4.0 keV, which is roughly 60 times the quiescent luminosity. Optical brightening was observed for only one night. The X-ray light curve is well described by a double fast rise and exponential decay model, attributed to the cooling process of a loop arcade structure formed subsequent to the initial large loop with a half-length of ~1.9 * 10^12 cm. Time-resolved X-ray spectra were fitted by a four-temperature apec model (with three components being the quiescent background), showing significant evolution of plasma temperature and emission measure over time. The estimated energy released in the LEIA band is ~3 * 10^39 erg, suggesting that this is likely the most energetic X-ray stellar flare with the longest duration detected to date. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2410_17999 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | LEIA discovery of the longest-lasting and most energetic stellar X-ray flare ever detected Mao, Xuan Liu, He-Yang Wang, Song Ling, Zhixing Yuan, Weimin Cheng, Huaqing Pan, Haiwu Li, Dongyue Favata, Fabio Ji, Tuo Zhang, Jujia Zhao, Xinlin Wan, Jing Cai, Zhiming Castro-Tirado, Alberto J. Dai, Yanfeng Deng, Licai Ding, Xu Ji, Kaifan Jin, Chichuan Lei, Yajuan Li, Huali Lin, Jun Liu, Huaqiu Liu, Mingjun Liu, Shuai Liu, Yuan Sun, Hui Sun, Shengli Sun, Xiaojin Shi, Jianrong Wang, Jianguo Wang, Jingxiu Wang, Wenxin Wei, Jianyan Xin, Liping Xiong, Dingrong Zhang, Chen Zhang, Wenda Zhang, Yonghe Zhang, Xiaofeng Zhao, Donghua Zhou, Guiping High Energy Astrophysical Phenomena Solar and Stellar Astrophysics The Lobster Eye Imager for Astronomy (LEIA) detected a new X-ray transient on 2022 November 7, identified as a superflare event occurring on a nearby K-type giant star HD 251108. The flux increase was also detected in follow-up observations at X-ray, UV and optical wavelengths. The flare lasted for about 40 days in soft X-ray observations, reaching a peak luminosity of ~1.1 * 10^34 erg/s in 0.5-4.0 keV, which is roughly 60 times the quiescent luminosity. Optical brightening was observed for only one night. The X-ray light curve is well described by a double fast rise and exponential decay model, attributed to the cooling process of a loop arcade structure formed subsequent to the initial large loop with a half-length of ~1.9 * 10^12 cm. Time-resolved X-ray spectra were fitted by a four-temperature apec model (with three components being the quiescent background), showing significant evolution of plasma temperature and emission measure over time. The estimated energy released in the LEIA band is ~3 * 10^39 erg, suggesting that this is likely the most energetic X-ray stellar flare with the longest duration detected to date. |
| title | LEIA discovery of the longest-lasting and most energetic stellar X-ray flare ever detected |
| topic | High Energy Astrophysical Phenomena Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2410.17999 |