Variations on Debris Disks. IV. An Improved Analytical Model for Collisional Cascades

Variations on Debris Disks. IV. An Improved Analytical Model for Collisional Cascades
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碎片盘的变体。

DOI:
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发表时间:
2017
期刊:
影响因子:
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通讯作者:
B. Bromley
B. Bromley
中科院分区:
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文献类型:
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作者:
S. Kenyon;B. Bromley

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我们推导了一个新的分析模型,用于在围绕单一中心恒星的薄环内的碰撞级联演化。在该模型中,最大对象的大小rmax随时间变化,为0.1-0.2。与rmax随时间不变的标准模型相比,这种演变导致环空中固体总质量Md和环空中小颗粒光度Ld的下降速度更快。我们证明,该分析模型与1 au和25 au环空的综合数值混凝模拟非常匹配。如果真正的碎片盘的演化遵循分析模型或数值模型的预测,那么观测到的演化恒星的光度就需要比以前的分析模型预测的质量多出两倍。
We derive a new analytical model for the evolution of a collisional cascade in a thin annulus around a single central star. In this model, rmax the size of the largest object changes with time, , with 0.1–0.2. Compared to standard models where rmax is constant in time, this evolution results in a more rapid decline of Md, the total mass of solids in the annulus, and Ld, the luminosity of small particles in the annulus: and . We demonstrate that the analytical model provides an excellent match to a comprehensive suite of numerical coagulation simulations for annuli at 1 au and at 25 au. If the evolution of real debris disks follows the predictions of the analytical or numerical models, the observed luminosities for evolved stars require up to a factor of two more mass than predicted by previous analytical models.
灾难性小天体碰撞的全面数值模拟
DOI: 10.1016/j.icarus.2008.09.013
发表时间: 2009
期刊: Icarus
影响因子: 3.2
作者:
Leinhardt Z
通讯作者: Leinhardt Z
DOI: 10.1088/0004-637x/745/1/79
发表时间: 2012-01-20
影响因子: 4.9
作者:
Leinhardt, Zoe M.;Stewart, Sarah T.
通讯作者: Stewart, Sarah T.