论文标题
AB Aurigae的圆盘腔内二进制引起的螺旋臂
Binary-induced spiral arms inside the disc cavity of AB Aurigae
论文作者
论文摘要
在这项工作中，我们证明了在AB Aurigae中观察到的内部螺旋结构可以由尘埃空腔内的二进制恒星创建。我们发现，质量比率为0.25的同伴，半高40 au的半高轴，偏心率为0.5，倾斜度为90°，可产生气态螺旋，与在$^{12} $ CO（2-1）中观察到的气螺旋匹配。基于环形光盘中的灰尘动力学（Poblete，Cuello和Cuadra 2019），我们将二进制相对于环形光盘的倾斜度限制为在60°至90°之间。我们预测，恒星伴侣的位置约为0.18 Arcsec，从中央恒星向东南偏东，圆盘平面上方。如果在不久的将来检测到该伴侣，我们的模型表明，它应该以6 mas/yr的速度在天空平面上移开。由于我们的同伴倾向于，我们还预测，螺旋结构似乎会随着时间而变化，而不仅仅是与同伴共同旋转。
In this work we demonstrate that the inner spiral structure observed in AB Aurigae can be created by a binary star orbiting inside the dust cavity. We find that a companion with a mass-ratio of 0.25, semi-major axis of 40 au, eccentricity of 0.5, and inclination of 90° produces gaseous spirals closely matching the ones observed in $^{12}$CO (2-1) line emission. Based on dust dynamics in circumbinary discs (Poblete, Cuello, and Cuadra 2019), we constrain the inclination of the binary with respect to the circumbinary disc to range between 60° and 90°. We predict that the stellar companion is located roughly 0.18 arcsec from the central star towards the east-southeast, above the plane of the disc. Should this companion be detected in the near future, our model indicates that it should be moving away from the primary star at a rate of 6 mas/yr on the plane of the sky. Since our companion is inclined, we also predict that the spiral structure will appear to change with time, and not simply co-rotate with the companion.
