Stellar flares detected with the Next Generation Transit Survey
Stellar flares detected with the Next Generation Transit Survey
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DOI：
10.1093/mnras/stab979
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发表时间：
2021-04
影响因子：
4.8
通讯作者：
J. Jackman;P. Wheatley;J. Acton;D. Anderson;D. Bayliss;J. Briegal;M. Burleigh;S. Casewell;B. Gänsicke;S. Gill;E. Gillen;M. Goad;M. Günther;B. Henderson;S. Hodgkin;J. Jenkins;C. Pugh;D. Queloz;L. Raynard;R. Tilbrook;C. Watson;R. West
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文献类型：
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作者：
J. Jackman;P. Wheatley;J. Acton;D. Anderson;D. Bayliss;J. Briegal;M. Burleigh;S. Casewell;B. Gänsicke;S. Gill;E. Gillen;M. Goad;M. Günther;B. Henderson;S. Hodgkin;J. Jenkins;C. Pugh;D. Queloz;L. Raynard;R. Tilbrook;C. Watson;R. West
我们在下一代凌日巡天（NGTS）的第一次数据发布中展示了对恒星耀斑的搜索结果。我们发现了来自339颗恒星的610个耀斑，光谱类型在F8和M6之间，其中大多数属于银河系薄盘。我们利用13秒的NGTS光曲线来测量耀斑的振幅、持续时间和辐射能量等特性。我们测量了K星和早期到中期m星的平均耀斑发生率，并提出了一种广义的方法来测量这些发生率，同时考虑到探测灵敏度的变化。我们发现，场龄K和早期M恒星表现出类似的耀斑行为，而完全对流的M恒星表现出增加的白光耀斑活动，我们将其归因于它们增加的自旋下降时间。我们还研究了主序前K星和M星的平均耀斑率，表明它们的耀斑活动相对于主序前K星和M星有所增加。
We present the results of a search for stellar flares in the first data release from the Next Generation Transit Survey (NGTS). We have found 610 flares from 339 stars, with spectral types between F8 and M6, the majority of which belong to the Galactic thin disc. We have used the 13-s cadence NGTS light curves to measure flare properties such as the flare amplitude, duration, and bolometric energy. We have measured the average flare occurrence rates of K and early to mid-M stars and present a generalized method to measure these rates while accounting for changing detection sensitivities. We find that field age K and early M stars show similar flare behaviour, while fully convective M stars exhibit increased white-light flaring activity, which we attribute to their increased spin-down time. We have also studied the average flare rates of pre-main-sequence K and M stars, showing they exhibit increased flare activity relative to their main-sequence counterparts.