边邻双星盘分子谱线观测分析的若干问题
Selected aspects of the analysis of molecular line observation of edge-on circumbinary disks
摘要：
上下文内腔、吸积臂和密度波是环双星盘密度分布的特征结构。它们是中心双星与周围盘的非轴对称引力的潮汐相互作用的结果，并且在内部区域最突出，其中不对称性最明显。目的。本研究的目的是测试的可行性重建的气体密度分布和量化的结构在边缘上的circumbinary磁盘的内部区域使用多个分子线观测的性能。方法.用二维流体动力学模拟方法计算了环双星盘的密度分布。随后，用三维辐射转移模拟生成分子线发射图。在此基础上，我们研究了空间分辨和未分辨盘的最内层区域的特征环双星结构的可观测性。结果我们发现，从边缘观察的环双星盘的空间分辨多波长分子线观测可以重建其内腔、吸积臂和密度波，对于空间分辨的观测，只能得到从腔到盘内缘过渡区的密度梯度的估计。
英文摘要：
Context. Inner cavities, accretion arms and density waves are characteristic structures in the density distribution of circumbinary disks. They are the result of the tidal interaction of the non-axisymmetric gravitational forces of the central binary with the surrounding disk and are most prominent in the inner region, where the asymmetry is most pronounced. Aims. The goal of this study is to test the feasibility of reconstructing the gas density distribution and quantifying properties of structures in the inner regions of edge-on circumbinary disks using multiple molecular line observations. Methods. The density distribution in circumbinary disks is calculated with two-dimensional hydrodynamic simulations. Subsequently, molecular line emission maps are generated with 3D radiative transfer simulations. Based on these, we investigate the observability of characteristic circumbinary structures located in the innermost region for spatially resolved and unresolved disks. Results. We find that it is possible to reconstruct the inner cavity, accretion arms and density waves from spatially resolved multi-wavelength molecular line observation of circumbinary disks seen edge-on. For the spatially unresolved observation only an estimate for the density gradient in the transition area from cavity to inner disk rim can be derived.
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