Detection of a giant white-light flare on an L2.5 dwarf with the Next Generation Transit Survey
Detection of a giant white-light flare on an L2.5 dwarf with the Next Generation Transit Survey
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DOI：
10.1093/mnrasl/slz039
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发表时间：
2019-02
影响因子：
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通讯作者：
J. Jackman;P. Wheatley;D. Bayliss;M. Burleigh;S. Casewell;P. Eigmüller;M. Goad;D. Pollacco;
中科院分区：
文献类型：
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作者：
J. Jackman;P. Wheatley;D. Bayliss;M. Burleigh;S. Casewell;P. Eigmüller;M. Goad;D. Pollacco;
我们展示了下一代凌日巡天（NGTS）对超冷 L2.5 矮星 ULAS J224940.13−011236.9 的 ΔV ∼ -10 耀斑的检测。该耀斑是在 NGTS 全帧图像中对晚型恒星进行有针对性的搜索时检测到的，是迄今为止从超冷矮星观测到的最大耀斑之一。这种耀斑还将白光耀斑的探测范围扩展到温度低于 2000 K 的恒星。我们计算出耀斑的能量为 $3.4^{+0.9}_{-0.7}\times 10^{33}$ erg，使其比太阳上的卡林顿事件能量高一个数量级。我们的数据展示了如何使用高节奏 NGTS 全帧图像来探测最新光谱类型中的白光耀斑行为。
We present the detection of a ΔV ∼ −10 flare from the ultracool L2.5 dwarf ULAS J224940.13−011236.9 with the Next Generation Transit Survey (NGTS). The flare was detected in a targeted search of late-type stars in NGTS full-frame images and represents one of the largest flares ever observed from an ultracool dwarf. This flare also extends the detection of white-light flares to stars with temperatures below 2000 K. We calculate the energy of the flare to be $3.4^{+0.9}_{-0.7}\times 10^{33}$ erg, making it an order of magnitude more energetic than the Carrington event on the Sun. Our data show how the high-cadence NGTS full-frame images can be used to probe white-light flaring behaviour in the latest spectral types.