arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 2005.10722astro-ph.EPastro-ph.GAastro-ph.IMastro-ph.SR
收藏

御夫座AB盘腔内的双星诱导旋臂

Binary-induced spiral arms inside the disc cavity of AB Aurigae

Pedro P. Poblete, Josh Calcino, Nicolás Cuello, Enrique Macías, Álvaro Ribas, Daniel J. Price, Jorge Cuadra, Christophe Pinte

摘要:

在这项工作中,我们证明了在御夫座AB中观察到的内部螺旋结构可以由尘埃腔内的双星轨道产生。我们发现,质量比为0.25,半长轴为40 au,偏心率为0.5,倾角为90°的伴星产生的气体螺旋与$^{12}$ CO(2-1)谱线发射中观察到的气体螺旋非常匹配。基于环双星盘中的尘埃动力学(Poblete,Cuello和Cuadra 2019),我们将双星相对于环双星盘的倾角限制在60°到90°之间。我们预测,这颗伴星的位置大约是0.18角秒,从中央恒星向东南偏东,在圆盘平面上方。如果这颗伴星在不久的将来被发现,我们的模型表明它应该以6质量/年的速度在天空平面上远离主星。由于我们的伴星是倾斜的,我们还预测螺旋结构将随着时间的推移而变化,而不仅仅是与伴星共同旋转。

英文摘要:

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.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑