Skip to content

Opening book details…

Can I read A $\Delta R\sim 9.5$ mag Super Flare of An Ultracool Star Detected by $\text{SVOM/GWAC}$ System on EtoBox?

A $\Delta R\sim 9.5$ mag Super Flare of An Ultracool Star Detected by $\text{SVOM/GWAC}$ System by Xin, L. P.; Li, H. L.; Wang, J.; Han, X. H.; Xu, Y.; Meng, X. M.; Cai, H. B.; Huang, L.; Lu, X. M.; Qiu, Y. L.; Wang, X. G.; Liang, E. W.; Dai, Z. G.; Wang, X. Y.; Wu, C.; Zhang, J. B.; Li, G. W.; Turpin, D.; Feng, Q. C.; Deng, J. S.; Sun, S. S.; Zheng, T. C.; Yang, Y. G.; Wei, J. Y. is a scholarly article available to read on EtoBox.

What is A $\Delta R\sim 9.5$ mag Super Flare of An Ultracool Star Detected by $\text{SVOM/GWAC}$ System about?

In this paper, we report the detection and follow-ups of a super stellar flare GWAC\,181229A with an amplitude of $\Delta R\sim$9.5 mag on a M9 type star by $\text{SVOM/GWAC}$ and the dedicated follow-up telescopes. The estimated bolometric energy $E_{bol}$ is $(5.56-9.25)\times10^{34}$ ergs, which places the event to be one of the most powerful flares on ultracool stars. The magnetic strength is inferred to be (3.6-4.7) kG. Thanks to the sampling with a cadence of 15 seconds, a new component near the peak time with a very steep decay is detected in the $R$-band light curve, followed by the two-component flare template given by Davenport et al. (2014). An effective temperature of $5340\pm40$ K is measured by a blackbody shape fitting to the spectrum at the shallower phase during the flare. The filling factors of the flare are estimated to be $\sim$30\% and 19\% at the peak time and at 54 min after the first detection. The detection of the particular event with large amplitude, huge-emitted energy and a new component demonstrates that a high cadence sky monitoring cooperating with fast follow-up observations is very essential for understanding the violent magnetic activity.

Author
Xin, L. P.; Li, H. L.; Wang, J.; Han, X. H.; Xu, Y.; Meng, X. M.; Cai, H. B.; Huang, L.; Lu, X. M.; Qiu, Y. L.; Wang, X. G.; Liang, E. W.; Dai, Z. G.; Wang, X. Y.; Wu, C.; Zhang, J. B.; Li, G. W.; Turpin, D.; Feng, Q. C.; Deng, J. S.; Sun, S. S.; Zheng, T. C.; Yang, Y. G.; Wei, J. Y.
Published
2020
Language
EN

More by Xin, L. P.; Li, H. L.; Wang, J.; Han, X. H.; Xu, Y.; Meng, X. M.; Cai, H. B.; Huang, L.; Lu, X. M.; Qiu, Y. L.; Wang, X. G.; Liang, E. W.; Dai, Z. G.; Wang, X. Y.; Wu, C.; Zhang, J. B.; Li, G. W.; Turpin, D.; Feng, Q. C.; Deng, J. S.; Sun, S. S.; Zheng, T. C.; Yang, Y. G.; Wei, J. Y.

Browse all works by Xin, L. P.; Li, H. L.; Wang, J.; Han, X. H.; Xu, Y.; Meng, X. M.; Cai, H. B.; Huang, L.; Lu, X. M.; Qiu, Y. L.; Wang, X. G.; Liang, E. W.; Dai, Z. G.; Wang, X. Y.; Wu, C.; Zhang, J. B.; Li, G. W.; Turpin, D.; Feng, Q. C.; Deng, J. S.; Sun, S. S.; Zheng, T. C.; Yang, Y. G.; Wei, J. Y.