约束L1527 IRS包络结构的红外散射光模拟
Constraining the Envelope Structure of L1527 IRS: Infrared Scattered Light Modeling
摘要：
我们模型斯皮策太空望远镜观测金牛座0级原恒星L1527 IRS（IRAS 04368+2557），以提供其原恒星包络结构的约束。L1527 IRS的近边缘倾斜，加上该物体的高空间分辨率近中红外图像和详细的IRS光谱，使我们能够很好地约束流出腔的几何形状，减少其他导出参数的不确定性。中红外散射光图像显示了一个明亮的中心源在一个黑暗的车道;这个黑暗的车道的纵横比是这样的，它看起来极不可能是一个磁盘阴影。在模拟这个黑暗的车道，我们得出结论，L1527 IRS可能不是一个简单的双极腔的标准TSC信封。我们发现有必要将暗巷和中心源建模为修改后的内包络结构。这种结构可能是由于复杂的风-包络线相互作用或由中心双星引起的。为了适应整体SED，我们需要中央源有一个大的近中红外过剩，这表明大量的磁盘吸积。我们的模型再现的整体形态和表面亮度分布的L1527 IRS相当不错，使用轴对称模型，以适应非轴对称的真实对象的局限性，和推导出的包络线下降率是在合理的协议与其他一些调查。IRAC对L1527 IRS的观测间隔12个月，显示出总通量的变化和相对双极腔的变化，表明吸积的不对称变化。我们还提供了高分辨率的模型图像，用于与当前地面仪器和未来天基望远镜的未来观测进行比较。
英文摘要：
We model Spitzer Space Telescope observations of the Taurus Class 0 protostar L1527 IRS (IRAS 04368+2557) to provide constraints on its protostellar envelope structure. The nearly edge-on inclination of L1527 IRS, coupled with the highly spatially-resolved near to mid-infrared images of this object and the detailed IRS spectrum, enable us to constrain the outflow cavity geometry quite well, reducing uncertainties in the other derived parameters. The mid-infrared scattered light image shows a bright central source within a dark lane; the aspect ratio of this dark lane is such that it appears highly unlikely to be a disk shadow. In modeling this dark lane, we conclude that L1527 IRS is probably not described by a standard TSC envelope with simple bipolar cavities. We find it necessary to model the dark lane and central source as a modified inner envelope structure. This structure may be due either to a complex wind-envelope interaction or induced by the central binary. To fit the overall SED, we require the central source to have a large near to mid-infrared excess, suggesting substantial disk accretion. Our model reproduces the overall morphology and surface brightness distribution of L1527 IRS fairly well, given the limitations of using axisymmetric models to fit the non-axisymmetric real object, and the derived envelope infall rates are in reasonable agreement with some other investigations. IRAC observations of L1527 IRS taken 12 months apart show variability in total flux and variability in the opposing bipolar cavities, suggesting asymmetric variations in accretion. We also provide model images at high resolution for comparison to future observations with current ground-based instrumentation and future space-based telescopes.
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