• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>The Astrophysical journal >Optical Spectropolarimetry And Asphericity Of The Type Ic Sn 2007gr
【24h】

Optical Spectropolarimetry And Asphericity Of The Type Ic Sn 2007gr

机译：Ic Sn 2007gr型的光谱偏振和非球面度

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

We present an optical spectropolarimetric observation of the Type Ic supernova (SN) 2007gr made with the Subaru Telescope at 21 days after maximum brightness (～37 days after the explosion). Nonzero polarization as high as ～3% is observed at the absorption feature of the Ca Ⅱ IR triplet. The polarization of the continuum light is ～0.5% if we estimate the interstellar polarization (ISP) component by assuming that the continuum polarization has a single polarization angle. This suggests that the axis ratio of the SN photosphere projected on the sky differs from unity by～10%. The polarization angle at the Ca Ⅱ absorption is almost aligned with that of the continuum light. These features may be understood in the context of a model in which a bipolar explosion with an oblate photosphere is being viewed from a slightly off-axis direction and explosively synthesized Ca near the polar region obscures the light that originates around the minor axis of the SN photosphere. Given the uncertainty in the ISP, however, the polarization data could also be interpreted with a model with an almost spherically symmetric photosphere and a clumpy Ca Ⅱ distribution.
机译：我们在最大亮度后21天（爆炸后约37天）展示了用斯巴鲁望远镜对Ic型超新星（SN）2007gr进行的光学旋光偏振观测。 CaⅡIR三重态的吸收特征观察到高达〜3％的非零极化。如果我们通过假设连续偏振具有单个偏振角来估计星际偏振（ISP）分量，则连续光的偏振约为〜0.5％。这表明SN光球投射在天空上的轴比与统一的相差约10％。 CaⅡ吸收时的偏振角几乎与连续光的偏振角一致。这些特征可以在模型的上下文中理解，在该模型中，从稍微偏离轴方向观察带有扁球形光圈的双极爆炸，并且在极性区域附近的爆炸性合成Ca遮盖了围绕SN短轴发出的光光球。然而，考虑到ISP中的不确定性，也可以使用具有几乎球形对称光球和块状CaⅡ分布的模型来解释偏振数据。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号