Type Ia supernovae: Progenitors and evolution with redshift
Type Ia supernovae: Progenitors and evolution with redshift
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Ia 型超新星：祖细胞和红移演化
DOI：
10.1063/1.1291694
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发表时间：
2000
期刊：
影响因子：
--
通讯作者：
T. Tsujimoto
中科院分区：
文献类型：
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作者：
K. Nomoto;H. Umeda;C. Kobayashi;I. Hachisu;M. Kato;T. Tsujimoto
Ia型超新星（SNe Ia）相对均匀的光变曲线和光谱演化使得人们可以将其作为确定宇宙学参数的“标准烛光”。宇宙学常数的统计意义值能否获得取决于超新星Ia的峰值亮度是否足够不受宇宙和星系演化的影响。在这里，我们首先回顾了单简并的情况下，阿拉塞卡质量白色矮星（WD）的超新星Ia模型。我们用两个通道来识别其祖先星的演化和种群：（1）WD+RG（红巨星）通道和（2）WD+MS（近主序星富氦星星）通道。在这些通道中，来自WDs吸积的强风起着关键作用，这产生了重要的年龄和金属丰度的演化。然后，我们解决的问题是否SNe Ia的性质依赖于系统的环境属性，如金属丰度和祖系统的年龄，以及是否存在显着的进化效应。我们认为，C+O WD中碳质量分数X（C）的变化（或WD初始质量的变化）导致了Ia超新星亮度的差异。这个模型可以解释观测到的Ia超新星亮度与星系类型和距银心距离的关系。最后，应用金属丰度效应对超新星Ia祖先演化的影响，我们预测了宇宙超新星速率历史作为不同类型星系中超新星速率的合成。
Relatively uniform light curves and spectral evolution of Type Ia supernovae (SNe Ia) have led to the use of SNe Ia as a “standard candle” to determine cosmological parameters. Whether a statistically significant value of the cosmological constant can be obtained depends on whether the peak luminosities of SNe Ia are sufficiently free from the effects of cosmic and galactic evolutions. Here we first review the single degenerate scenario for the Chandrasekhar mass white dwarf (WD) models of SNe Ia. We identify the progenitor’s evolution and population with two channels: (1) the WD+RG (red-giant) and (2) the WD+MS (near mainsequence He-rich star) channels. In these channels, the strong wind from accreting WDs plays a key role, which yields important age and metallicity effects on the evolution. We then address the questions whether the nature of SNe Ia depends systematically on environmental properties such as metallicity and age of the progenitor system and whether significant evolutionary effects exist. We suggest that the variation of the carbon mass fraction X(C) in the C+O WD (or the variation of the initial WD mass) causes the diversity of the brightness of SNe Ia. This model can explain the observed dependences of SNe Ia brightness on the galaxy types and the distance from the galactic center. Finally, applying the metallicity effect on the evolution of SN Ia progenitors, we make a prediction of the cosmic supernova rate history as a composite of the supernova rates in different types of galaxies.