论文标题
快速，时间分辨光谱法揭示的两个M型刀片中与耀斑相关的复合动力学
Flaring-associated Complex Dynamics in Two M-dwarfs Revealed by Fast, Time-resolved Spectroscopy
论文作者
论文摘要
据信，系外行星的可居住性受到宿主恒星活动的深刻影响，尽管相关的冠状质量弹出（CME）仍然很少在太阳能和晚期恒星中被检测到。我们在这里报告了一项关于由碎角摄像机系统进行的高积极调查触发的两种M型武器耀斑的观察性研究。在这两个事件中，快速，时间分辨的光谱学使我们能够以几乎为零的体积速度识别对称的宽H $α$排放，而且还具有较大的预计最大速度，高达$ \ sim700-800 \ \\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\\ \ \ \ \ \ \ s^km \ s^s^{ - 1}} $。这种扩展可能是由恒星肢体的鲜明（压力）效应或与燃烧相关的CME产生的。在CME方案的上下文中，CME质量估计为$ \ sim4 \ times10^{18} $ g和$ 2 \ times10^{19} $ g。此外，我们的光谱分析揭示了这两个事件中窄H $α$排放的线中心的时间变化。变化振幅为$ \ mathrm {km \ s^{ - 1}} $，在一个事件中可以归因于色层蒸发，另一个事件中的二进制场景。通过从我们的光度监测仪确定的总燃烧能量，我们显示出一种增强趋势，其中较大的耀斑能量，CME质量更高。
Habitability of an exoplanet is believed to be profoundly affected by activities of the host stars, although the related coronal mass ejections (CMEs) are still rarely detected in solar-like and late-type stars. We here report an observational study on flares of two M-dwarfs triggered by the high-cadence survey performed by the Ground Wide-angle Camera system. In both events, the fast, time-resolved spectroscopy enables us to identify symmetric broad H$α$ emission with not only a nearly zero bulk velocity, but also a large projected maximum velocity as high as $\sim700-800\ \mathrm{km\ s^{-1}}$. This broadening could be resulted from either Stark (pressure) effect or a flaring-associated CME at stellar limb. In the context of the CME scenario, the CME mass is estimated to be $\sim4\times10^{18}$ g and $2\times10^{19}$ g. In addition, our spectral analysis reveals a temporal variation of the line center of the narrow H$α$ emission in both events. The variation amplitudes are at tens of $\mathrm{km\ s^{-1}}$, which could be ascribed to the chromospheric evaporation in one event, and to a binary scenario in the other one. With the total flaring energy determined from our photometric monitor, we show a reinforced trend in which larger the flaring energy, higher the CME mass is.
