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arXiv 1504.05702astro-ph.EP
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在宽行星质量伴星影响下的碎片盘:HD106906系统

A debris disk under the influence of a wide planetary mass companion: The system of HD106906

Lucie Jilkova, Simon Portegies Zwart

摘要:

HD 106906是一颗1300万年前的恒星,其轨道上有一个至少0.067 M_Moon的碎片盘,其内外半径分别为20 AU和120 AU,以及一颗距离650 AU的行星。我们使用这种紧密的低质量盘和宽行星的奇怪组合来激励我们对这个系统的模拟。我们研究了初始条件的参数空间,以量化碎片盘的质量损失及其在行星影响下的寿命。我们发现,当行星的轨道接近恒星比约50 AU和低倾角相对于磁盘(小于约10度),更多的磁盘材料被扰动外比内的时间尺度短于1万年的观测约束的区域。考虑到系统的年龄,如此短的圆盘寿命与行星-行星散射的时间尺度不相容,这是解释行星广泛分离的假设之一。对于某些配置,当行星的轨道相对于磁盘倾斜时,后者将开始摆动。我们认为,这种摆动是由一种类似于Kozai-Lidov振荡的机制。我们还观察到各种共振结构(如环和螺旋臂)诱导的磁盘的行星。

英文摘要:

The 13 Myr old star HD106906 is orbited by a debris disk of at least 0.067 M_Moon with an inner and outer radius of 20 AU and 120 AU, respectively, and by a planet at a distance of 650 AU. We use this curious combination of a close low-mass disk and a wide planet to motivate our simulations of this system. We study the parameter space of the initial conditions to quantify the mass loss from the debris disk and its lifetime under the influence of the planet. We find that when the planet orbits closer to the star than about 50 AU and with low inclination relative to the disk (less than about 10 degrees), more disk material is perturbed outside than inside the region constrained by observations on timescales shorter than 1 Myr. Considering the age of the system, such a short lifetime of the disk is incompatible with the timescale for planet--planet scattering which is one of the scenarios suggested to explain the wide separation of the planet. For some configurations when the planet's orbit is inclined with respect to the disk, the latter will start to wobble. We argue that this wobbling is caused by a mechanism similar to the Kozai--Lidov oscillations. We also observe various resonant structures (such as rings and spiral arms) induced in the disk by the planet.

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