IIn型超新星的早期紫外线观测限制了其星周物质的非球面性
Early Ultra-Violet observations of type IIn supernovae constrain the asphericity of their circumstellar material
摘要：
本文报道了12颗Ⅰ In型超新星（SNe Ⅱ In）在紫外光和可见光下的早期演化。我们使用这个调查约束的几何形状的拱星材料（CSM）周围SN IIn爆炸，这可能会揭示他们的祖先的多样性。为了区分非球面和球面拱星材料（CSM），我们估计的黑体半径的时间演变的SNe IIn我们的样本，以下的方法介绍了由苏马尼亚克等人。我们发现，更高的光度对象往往显示证据非球面CSM。根据这种相关性是否是由于物理原因或一些选择偏差，我们得出一个较低的限制在35%和66%之间的分数SNe IIn显示证据非球面CSM。这一结果表明，围绕SNe IIn的CSM的非球面性是常见的-与经历相当大的质量损失的恒星的分辨率图像的数据一致。为了对这些事件进行更真实的建模，应将其考虑在内。
英文摘要：
We present a survey of the early evolution of 12 Type IIn supernovae (SNe IIn) in the Ultra-Violet (UV) and visible light. We use this survey to constrain the geometry of the circumstellar material (CSM) surrounding SN IIn explosions, which may shed light on their progenitor diversity. In order to distinguish between aspherical and spherical circumstellar material (CSM), we estimate the blackbody radius temporal evolution of the SNe IIn of our sample, following the method introduced by Soumagnac et al. We find that higher luminosity objects tend to show evidence for aspherical CSM. Depending on whether this correlation is due to physical reasons or to some selection bias, we derive a lower limit between 35% and 66% on the fraction of SNe IIn showing evidence for aspherical CSM. This result suggests that asphericity of the CSM surrounding SNe IIn is common - consistent with data from resolved images of stars undergoing considerable mass loss. It should be taken into account for more realistic modelling of these events.
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