标题： 一个恒星超级耀斑中的多周期振荡 显示英文标题

标题： A Multi-Period Oscillation in a Stellar Superflare

摘要： 耀斑的规模比最强烈的太阳耀斑大几个数量级，这些耀斑在类似太阳的恒星上经常被观测到，这引发了关于太阳耀斑和恒星耀斑是否由相同的物理过程引起的疑问。 在本信中，我们介绍了由NASA的开普勒任务观测到的恒星KIC9655129上的白光恒星超级耀斑，该耀斑表现出罕见的多周期准周期脉动（QPP）模式。 利用小波和自相关技术检测到了两个显著的周期性过程，周期分别为78 +/- 12分钟和32 +/- 2分钟。 通过比较两个周期性的相位和衰减时间，发现QPP信号最可能是线性的，表明这两个周期性是独立的，可能分别对应于耀斑区域的不同磁流体动力学模式，或者同一模式的不同空间谐波。 多个周期性的存在表明QPP是由磁流体动力学振荡引起的，并暗示恒星耀斑期间发生的物理过程可能与太阳耀斑相同。 显示英文摘要

摘要： Flares that are orders of magnitude larger than the most energetic solar flares are routinely observed on Sun-like stars, raising the question of whether the same physical processes are responsible for both solar and stellar flares. In this letter we present a white-light stellar superflare on the star KIC9655129, observed by NASA's Kepler mission, with a rare multi-period quasi-periodic pulsation (QPP) pattern. Two significant periodic processes were detected using the wavelet and autocorrelation techniques, with periods of 78 +/- 12 min and 32 +/- 2 min. By comparing the phases and decay times of the two periodicities, the QPP signal was found to most likely be linear, suggesting that the two periodicities are independent, possibly corresponding either to different magnetohydrodynamic modes of the flaring region, or different spatial harmonics of the same mode. The presence of multiple periodicities is a good indication that the QPPs were caused by magnetohydrodynamic oscillations, and suggests that the physical processes in operation during stellar flares could be the same as those in solar flares.