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arXiv 1608.03147astro-ph.EP
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从光子旅行时间看原行星盘中的螺旋

Spirals in protoplanetary disks from photon travel time

M. Kama, P. Pinilla, A. N. Heays

摘要:

螺旋结构是原行星盘的散射光图像中的一个常见特征,并且作为行星存在的可能示踪剂而引起极大兴趣。然而,其他的机制已经被提出来解释它们,包括自引力,盘包相互作用和死区边界。这些机制很好地解释了许多螺旋,但不能很容易地解释非常松散的螺旋和单旋臂。我们研究了光的旅行时间上的阴影的形状上的效果由一个团块轨道接近(${\sim}1\,$ AU内)的中央恒星,那里可以有显着的轨道运动在光的旅行时间从团块到外盘,然后到天空平面。这种光线到达天空平面的延迟产生了各种螺旋形和弧形阴影,我们用一个一般的拟合公式来描述一个张开的倾斜圆盘。

英文摘要:

Spiral structures are a common feature in scattered-light images of protoplanetary disks, and of great interest as possible tracers of the presence of planets. However, other mechanisms have been put foward to explain them, including self-gravity, disk-envelope interactions, and dead zone boundaries. These mechanisms explain many spirals very well, but are unable to easily account for very loosely wound spirals and single spiral arms. We study the effect of light travel time on the shape of a shadow cast by a clump orbiting close (within ${\sim}1\,$au) of the central star, where there can be significant orbital motion during the light travel time from the clump to the outer disk and then to the sky plane. This delay in light rays reaching the sky plane gives rise to a variety of spiral- and arc-shaped shadows, which we describe with a general fitting formula for a flared, inclined disk.

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。

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