| 高速Ia型超新星的蓝色超出: 星周介质的尘埃散射 |
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| 引用本文： | 胡茂凯,王力帆,王晓锋.高速Ia型超新星的蓝色超出: 星周介质的尘埃散射[J].天文学报,2023,64(2):13-22. |
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| 作者姓名： | 胡茂凯 王力帆 王晓锋 |
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| 作者单位： | 中国科学院紫金山天文台 南京 210023;中国科学技术大学天文与空间科学学院 合肥 230026;Department of Physics and Astronomy, Texas A&M University, Texas TX-77843;清华大学物理系 北京 100084;北京天文馆 北京 100044 |
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| 基金项目： | 国家自然科学基金项目(11761141001)、中国科学院前沿科学重点研究项目(QYZDY-SSW-SLH010)资助 |
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| 摘 要： | Ia型超新星起源于碳氧白矮星在质量接近钱德拉塞卡极限时的热核爆炸,并被广泛地用作宇宙学距离的标准烛光.然而, Ia型超新星的前身星系统和爆炸机制还存在很多不明确的地方.近几十年来, Ia型超新星的星周环境得到了越来越多的关注.星周介质的空间分布性质为探究Ia型超新星的物理起源提供了重要线索.同时星周尘埃的散射会在Ia型超新星晚期的光变曲线、光谱和偏振等方面产生可观测效应.光谱上正常的Ia型超新星可以分成两类:喷射物速度正常和高速Ia型超新星.对比两者的光变曲线可以发现高速Ia型超新星在光极大后几个月内有明显颜色偏蓝的超出.该蓝色超出可以通过星周介质中的尘埃散射拟合得到.同时, Ia型超新星晚期光谱的拟合可以限制星周尘埃的颗粒大小等性质,晚期的偏振信号可以有效地限制星周尘埃的空间分布.拟合结果表明针对Ia型超新星晚期的多次图像偏振观测是揭示其星周尘埃环境特征的重要手段.
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| 关 键 词： | 超新星:普通 星周物质 偏振 |
| 收稿时间： | 2022/4/2 0:00:00 |
The Blue Excess of High-velocity Type Ia Supernovae: Dust Scattering of Circumstellar Material |
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| HU Mao-kai,WANG Li-fan,WANG Xiao-feng.The Blue Excess of High-velocity Type Ia Supernovae: Dust Scattering of Circumstellar Material[J].Acta Astronomica Sinica,2023,64(2):13-22. |
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| Authors: | HU Mao-kai WANG Li-fan WANG Xiao-feng |
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| Institution: | Purple Mountain Observatory, Chinese Academy of Sciences, Nanjing 210023;School of Astronomy and Space Science, University of Science and Technology of China, Hefei 230026;Department of Physics and Astronomy, Texas A&M University, Texas TX-77843; Physics Department, Tsinghua University, Beijing 100084;Beijing Planetarium, Beijing 100044 |
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| Abstract: | Type Ia supernovae (SNe Ia) originate from thermonuclear explosions of carbon-oxygen white dwarfs at masses approaching the Chandrasekhar limit and are widely used as standard candles for cosmological distances. However, the progenitor system and explosion mechanism of SNe Ia are still unclear. The circumstellar environment of SNe Ia has received increasing attention in recent decades. The distance and other geometric properties of the circumstellar material provide important clues for exploring the physical origin of SNe Ia. At the same time, the scattering of circumstellar dusts can produce observable effects on the light curve, spectrum and polarization during the late phase of SNe Ia. The spectroscopically normal SNe Ia can be classified into two categories: normal-velocity and high-velocity SNe Ia. Comparing the light curve of the two, it can be found that the high-velocity SNe Ia have a clear blue excess within a few months after the maximum brightness. This blue excess can be fitted by dust scattering in the circumstellar material. At the same time, the fitting late-phase spectra of SNe Ia can limit the size of dust grains, and the late-phase polarization signal can effectively limit the geometric distribution of circumstellar dusts. The result indicates that multi-epochs image polarimetry during the late phase of SNe Ia is an important probe to reveal the characteristics of circumstellar dusts. |
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| Keywords: | supernovae: general circumstellar matter polarization |
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