论文标题
从低质量恒星上的超级风光造成长达一分钟的准周期性脉动加倍
Doubling of minute-long Quasi-Periodic Pulsations from super-flares on a low mass star
论文作者
论文摘要
使用安装在2.4米泰国国家望远镜上的Ultraspec仪器，我们观察到了两个大耀斑，每种耀斑的总能量接近10^34 ERG，并带有亚秒的节奏。小波分析（傅立叶变换加上经验模式分解）的组合揭示了准期脉动（QPP），该脉动表现出明显的振荡时期倍增。这两个事件在几分钟内均显示了几分钟的振荡，尽管有次秒的节奏，但仍未证据表明振荡。 QPP时期QPP时期和较短的寿命较短的QPP模式在冠状环中强烈偏爱磁性水力学波的共振动力学。我们估计循环长度为0.2-0.7 r*，与典型的太阳冠状环相一致。这些观察结果表明了恒星电晕中紧凑的等离子体回路的罕见和令人信服的证据。
Using the ULTRASPEC instrument mounted on the 2.4-m Thai National Telescope, we observed two large flares, each with a total energy close to 10^34 erg with sub-second cadence. A combination of a wavelet analysis, a Fourier transform plus an empirical mode decomposition, reveals quasi-period pulsations (QPP) which exhibit an apparent doubling of the oscillation period. Both events showed oscillations of a few minutes over a interval of several minutes, and despite the availability of sub-second cadence, there was no evidence of sub-minute oscillations. The doubling of the QPP periods and shorter lifetime of shorter-period QPP modes strongly favour resonant dynamics of magnetohydrodynamic waves in a coronal loop. We estimate loop lengths to be 0.2-0.7 R*, in agreement with a typical length of solar coronal loops. These observations presents rare and compelling evidence for the presence of compact plasma loops in a stellar corona.
