Structures in circumbinary disks: Prospects for observability

Structures in circumbinary disks: Prospects for observability
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环二元盘中的结构:可观测性的前景

DOI:
10.1051/0004-6361/201321770
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发表时间:
2015
期刊:
arXiv: Earth and Planetary Astrophysics
影响因子:
--
通讯作者:
V. Grinin
V. Grinin
中科院分区:
--
文献类型:
--
作者:
J.P. Ruge;S. Wolf;T. Demidova;V. Grinin

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在过去的十年里,围绕着各种年轻双星的环双星盘被发现。流体动力学计算表明,中心双星星星与周围盘之间的引力相互作用导致盘密度轮廓的全局扰动.AimsWe study the observability of characteristic large-scale disk structures resulting from the binary-disk interaction in the case of close binary systems.MethodsWe derived the structures of circumbinary disks from smoothed-particle hydrodynamics simulations.随后,我们进行了辐射传输模拟,以获得散射光和热再发射图。我们研究了双星质量比、双星轨道相对于盘中平面的倾角以及双星轨道的偏心率对观测量的影响。ResultsWe发现,如果盘是正面的,阿尔马将允许跟踪盘的内边缘的不对称性并可能分辨螺旋臂。阿尔马将允许通过径向亮度轮廓中的不对称性来检测盘密度分布中的扰动。通过圆盘的非对称结构,形成的区域的温度比同等未扰动圆盘中相同位置的温度高2.6倍。密度波和旋臂随时间变化的外观对物体的总再发射通量有百分之几的影响。
ContextDuring the past decade circumbinary disks have been discovered around various young binary stars. Hydrodynamical calculations indicate that the gravitational interaction between the central binary star and the surrounding disk results in global perturbations of the disk density profile.AimsWe study the observability of characteristic large-scale disk structures resulting from the binary-disk interaction in the case of close binary systems.MethodsWe derived the structure of circumbinary disks from smoothed-particle hydrodynamic simulations. Subsequently, we performed radiative transfer simulations to obtain scattered light and thermal reemission maps. We investigated the influence of the binary mass ratio, the inclination of the binary orbit relative to the disk midplane, and the eccentricity of the binary orbit on observational quantities.ResultsWe find that ALMA will allow tracing asymmetries of the inner edge of the disk and potentially resolving spiral arms if the disk is seen face-on. For an edge-on orientation, ALMA will allow detecting perturbations in the disk density distribution through asymmetries in the radial brightness profile. Through the asymmetric structure of the disks, areas are formed with a temperature 2.6 times higher than at the same location in equivalent unperturbed disks. The time-dependent appearance of the density waves and spiral arms in the disk affects the total re-emission flux of the object by a few percent.
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