标题： 仙后座V488碎片盘的极端变异性 显示英文标题

标题： Extreme Variability of the V488 Persei Debris Disk

摘要： V488 Persei 是目前已知的在拦截和再辐射恒星光度比例方面最极端的碎片盘。 其盘的红外输出变化非常大，在这方面类似于之前已知变化最大的盘，即 NGC 2547 中 ID8 周围的盘。 我们表明，这些变化可能是由于行星系统中行星或低质量棕矮星成员通过引力扰动导致的大天体（直径大于 100 公里）带中的碰撞造成的。 由此产生的尘埃由于恒星风的拖拽作用正落入恒星中。 所指示的天体破坏率非常高，因此目前的活动水平很可能不会持续超过约 1000 - 10,000 年，这可能标志着行星系统结构的重大重新排列。 显示英文摘要

摘要： V488 Persei is the most extreme debris disk known in terms of the fraction of the stellar luminosity it intercepts and reradiates. The infrared output of its disk is extremely variable, similar in this respect to the most variable disk known previously, that around ID8 in NGC 2547. We show that the variations are likely to be due to collisions of large planetesimals (> 100 km in diameter) in a belt being stirred gravitationally by a planetary or low-mass-brown-dwarf member of a planetary system around the star. The dust being produced by the resulting collisions is falling into the star due to drag by the stellar wind. The indicated planetesimal destruction rate is so high that it is unlikely that the current level of activity can persist for much longer than ~ 1000 - 10,000 years, and it may signal a major realignment of the configuration of the planetary system.