磁层捕获的尘埃和WD 1145+017处异常凌日的可能模型
Magnetospherically-trapped dust and a possible model for the unusual transits at WD 1145+017
摘要：
在WD 1145+017附近观测到的迅速演变的尘埃和气体消光为行星体在白矮星上的破坏-吸积机制打开了一个实时窗口，并强调了考虑这些物体周围尘埃粒子动力学的重要性。这里有人认为，（带电）尘埃颗粒和恒星磁场之间的相互作用是一个重要的组成部分，在理解的物理分布红外发射粒子在附近的白矮星。这些想法被用来提出WD 1145+017的可能模型，其中不寻常的凌日形状是由恒星磁层中捕获的不透明尘埃云造成的。该模型可以解释所观察到的过境周期，如果恒星旋转是近4.5小时，因为被困的尘埃云，然后位于附近或内的共同旋转半径。该模型要求表面磁场至少在几十kG左右。与大的微行星在潮汐解体时的偏心轨道相反，被磁层捕获的尘埃云的轨道基本上是圆形的，与观测结果一致。
英文摘要：
The rapidly evolving dust and gas extinction observed towards WD 1145+017 has opened a real-time window onto the mechanisms for destruction-accretion of planetary bodies onto white dwarf stars, and has served to underline the importance of considering the dynamics of dust particles around such objects. Here it is argued that the interaction between (charged) dust grains and the stellar magnetic field is an important ingredient in understanding the physical distribution of infrared emitting particles in the vicinity of such white dwarfs. These ideas are used to suggest a possible model for WD 1145+017 in which the unusual transit shapes are caused by opaque clouds of dust trapped in the stellar magnetosphere. The model can account for the observed transit periodicities if the stellar rotation is near 4.5 h, as the clouds of trapped dust are then located near or within the co-rotation radius. The model requires the surface magnetic field to be at least around some tens of kG. In contrast to the eccentric orbits expected for large planetesimals undergoing tidal disintegration, the orbits of magnetospherically-trapped dust clouds are essentially circular, consistent with the observations.
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