环双星，非过渡：关于HD142527盘中的旋臂、空洞、阴影、快速径向流、流光和马蹄形
Circumbinary, not transitional: On the spiral arms, cavity, shadows, fast radial flows, streamers and horseshoe in the HD142527 disc
摘要：
我们提出了三维流体动力学模型的HD 142527原行星盘，一个明亮的和良好的研究光盘，显示螺旋和阴影的散射光周围的100金气体腔，一个大的马蹄形尘埃结构在毫米连续发射，连同神秘的快速径向流动和气体运动学中看到的流光。通过考虑几个可能的轨道与所观察到的弧一致，我们表明，所有的主要观测特征可以解释的一个机制-光盘和观测到的双同伴之间的相互作用。我们发现，螺旋，阴影和马蹄铁只在正确的位置角由一个倾斜和偏心轨道接近近星点的伴星产生-来自Lacour等人的“红色”家族。尘埃气体模拟显示径向和方位角浓度的灰尘周围的空腔，所观察到的马蹄形一致。这个模型在HD 142527圆盘中的成功表明，其他显示空腔，螺旋和尘埃不对称性的毫米明亮过渡圆盘也可以通过与中央同伴的相互作用来解释。
英文摘要：
We present 3D hydrodynamical models of the HD142527 protoplanetary disc, a bright and well studied disc that shows spirals and shadows in scattered light around a 100 au gas cavity, a large horseshoe dust structure in mm continuum emission, together with mysterious fast radial flows and streamers seen in gas kinematics. By considering several possible orbits consistent with the observed arc, we show that all of the main observational features can be explained by one mechanism - the interaction between the disc and the observed binary companion. We find that the spirals, shadows and horseshoe are only produced in the correct position angles by a companion on an inclined and eccentric orbit approaching periastron - the 'red' family from Lacour et al. (2016). Dust-gas simulations show radial and azimuthal concentration of dust around the cavity, consistent with the observed horseshoe. The success of this model in the HD142527 disc suggests other mm-bright transition discs showing cavities, spirals and dust asymmetries may also be explained by the interaction with central companions.
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