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arXiv 1805.04501astro-ph.SR
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后AGB双星IRAS08544-4431周围尘埃盘的扰动升华边缘

The perturbed sublimation rim of the dust disk around the post-AGB binary IRAS08544-4431

J. Kluska, M. Hillen, H. Van Winckel, R. Manick, M. Min, S. Regibo, P. Royer

摘要:

内容:后渐近巨星分支(AGB)双星被稳定的尘埃和气体盘包围,类似于年轻恒星周围的盘。而显着的努力是花在模拟观测磁盘周围的年轻恒星的对象,磁盘周围的后AGB双星收到显着较少的关注,即使它们构成了显着的限制理论的磁盘物理和二进制的演变。目的:我们想研究后AGB恒星周围的环双星盘的结构和现象。我们继续分析我们的近红外干涉仪图像的内缘周围的环双星盘IRAS 08544 -4431。我们想了解这个内部盘边缘的物理规律。研究方法:我们使用一个尘埃盘的辐射转移模型来同时再现测光以及IRAS 08544 -4431上的近红外干涉数据集。该模型假设流体静力平衡,并考虑粉尘沉降自洽。结果如下:最佳拟合的辐射转移模型显示出极好的协议的光谱能量分布毫米波长,以及与PIONIER能见度数据。它需要一个圆形的内缘结构,从8.25 au的半径开始。然而,该模型不能完全再现检测到的过分辨通量,也不能再现内边缘的方位角通量分布。虽然不对称的内盘边缘结构可能是盘-双星相互作用的结果,但额外的过分辨通量的来源仍然不清楚。结论:在年轻的恒星天体中,IRAS 08544 -4431的盘内缘是由尘埃升华物理所控制的。需要额外的观测来了解扩展通量的起源和圆盘内缘的方位角扰动。

英文摘要:

Context: Post-Asymptotic Giant Branch (AGB) binaries are surrounded by stable dusty and gaseous disks similar to the ones around young stellar objects. Whereas significant effort is spent on modeling observations of disks around young stellar objects, the disks around post-AGB binaries receive significantly less attention, even though they pose significant constraints on theories of disk physics and binary evolution. Aims: We want to examine the structure of and phenomena at play in circumbinary disks around post-AGB stars. We continue the analysis of our near-infrared interferometric image of the inner rim of the circumbinary disk around IRAS08544-4431. We want to understand the physics governing this inner disk rim. Methods: We use a radiative transfer model of a dusty disk to reproduce simultaneously the photometry as well as the near-infrared interferometric dataset on IRAS08544-4431. The model assumes hydrostatic equilibrium and takes dust settling self-consistently into account. Results: The best-fit radiative transfer model shows excellent agreement with the spectral energy distribution up to mm wavelengths as well as with the PIONIER visibility data. It requires a rounded inner rim structure, starting at a radius of 8.25 au. However, the model does not fully reproduce the detected over-resolved flux nor the azimuthal flux distribution of the inner rim. While the asymmetric inner disk rim structure is likely to be the consequence of disk-binary interactions, the origin of the additional over-resolved flux remains unclear. Conclusions: As in young stellar objects, the disk inner rim of IRAS08544-4431 is ruled by dust sublimation physics. Additional observations are needed to understand the origin of the extended flux and the azimuthal perturbation at the inner rim of the disk.

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