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Spectropolarimetric signatures of clumpy supernova ejecta.

机译:块状超新星喷射的光谱极化特征。

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摘要

Polarization has been detected at early times for all types of supernova, indicating that all such systems result from or quickly develop some form of asymmetry. In addition, the detection of strong line polarization in supernovae is suggestive of chemical inhomogeneities ("clumps") in the layers above the photosphere, which may reflect hydrodynamical instabilities during the explosion. We have developed a fast, flexible, approximate semi-analytic code for modeling polarized line radiative transfer within 3-D inhomogeneous rapidly-expanding atmospheres. Given a range of model parameters, the code randomly generates sets of clumps in the expanding ejecta and calculates the emergent line profile and Stokes parameters for each configuration. The ensemble of these configurations represents both the effects of various host geometries and of different viewing angles. We present results for the first part of our survey of model geometries, specifically the effects of the number and size of clumps (and the related effect of filling factor) on the emergent spectrum and Stokes parameters. We have also developed a method to connect the results of our simulations to robust observational parameters such as maximum degree of polarization and polarized flux throughout the line. Our models, in connection with spectropolarimetric observations, can constrain the 3-D structure of supernova ejecta and offer important insight into the SN explosion physics and the nature of their progenitor system.
机译:早期已对所有类型的超新星检测到极化,这表明所有此类系统都是由某种形式的不对称引起或迅速发展的。另外,对超新星中强线极化的检测表明在光球上方各层中存在化学不均匀性(“团块”),这可能反映了爆炸过程中的流体动力学不稳定性。我们已经开发了一种快速,灵活,近似的半解析代码,用于对3-D非均匀快速膨胀大气中的极化线辐射传递进行建模。在给定一系列模型参数的情况下,该代码会在扩展的喷射器中随机生成一组结块,并为每种配置计算出涌现线剖面和斯托克斯参数。这些配置的整体代表了各种主机几何形状和不同视角的影响。我们提供了模型几何调查的第一部分的结果,特别是块的数量和大小(以及填充因子的相关影响)对出现光谱和斯托克斯参数的影响。我们还开发了一种方法,可以将模拟结果与鲁棒的观测参数(例如,整个线路的最大极化程度和极化通量)相关联。我们的模型与光谱极化观测相结合,可以约束超新星喷射的3-D结构,并为SN爆炸物理学及其祖先系统的性质提供重要见识。

著录项

  • 作者

    Hole, Karen Tabetha.;

  • 作者单位

    The University of Wisconsin - Madison.;

  • 授予单位 The University of Wisconsin - Madison.;
  • 学科 Physics Astronomy and Astrophysics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 83 p.
  • 总页数 83
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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