来自GTC分光光度法的KIC 8462852的非灰色变暗事件
Non-grey dimming events of KIC 8462852 from GTC spectrophotometry
摘要：
我们报告的地基分光光度KIC 8462852，在其第一次调光事件，因为开普勒任务结束。暗点显示出清晰的颜色特征，并且在可见的蓝色波长中比红色波长更深。通量损失的波长依赖性可以用$2.19\pm0.45$的朗格斯特伦吸收系数来描述，这与粒径在0.0015至0.15 $μ$ m量级的光学薄尘埃的吸收是相容的。这些粒子将小于在靠近恒星时抵抗辐射压力吹出所需的尺寸。在掩星事件期间，这些粒子必须以天为时间尺度补充。如果尘埃确实是KIC 8462852的变暗事件的来源，那么更深的变暗事件应该显示出更多的中性颜色，正如从光学厚吸收体所预期的那样。
英文摘要：
We report ground-based spectrophotometry of KIC 8462852, during its first dimming events since the end of the Kepler mission. The dimmings show a clear colour-signature, and are deeper in visual blue wavelengths than in red ones. The flux loss' wavelength dependency can be described with an Ångström absorption coefficient of $2.19\pm0.45$, which is compatible with absorption by optically thin dust with particle sizes on the order of 0.0015 to 0.15 $μ$m. These particles would be smaller than is required to be resistant against blow-out by radiation pressure when close to the star. During occultation events, these particles must be replenished on time-scales of days. If dust is indeed the source of KIC 8462852's dimming events, deeper dimming events should show more neutral colours, as is expected from optically thick absorbers.
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