Environments of Type Ia Supernovae with Different Relative Equivalent Widths of the Si ii Feature in Their Spectra

Environments of Type Ia Supernovae with Different Relative Equivalent Widths of the Si ii Feature in Their Spectra
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光谱中 Si ii 特征相对当量宽度不同的 Ia 型超新星环境

DOI:
10.3847/1538-4357/acad77
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发表时间:
2022-12
期刊:
The Astrophysical Journal
影响因子:
--
通讯作者:
Xiao-Feng Wang
Xiao-Feng Wang
中科院分区:
其他
文献类型:
--
作者:
Xiang-Cun Meng;Ju-Jia Zhang;Xulin Zhao;Li-Ping Li;Xiao-Feng Wang

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抽象的。尽管Ia型超新星(SNe Ia)在宇宙学等许多天体物理领域非常重要,但它们的爆炸机制和前身系统仍不清楚。在物理学中,Si ii 635.5 nm 吸收特征的相对等效宽度(REW)反映了超新星喷射物中硅的速度区间,这可能为超新星 Ia 的爆炸机制提供约束。在本文中,我们根据 Si ii 635.5 nm 吸收线在最大光附近的 REW,将 SNe Ia 分为宽线 (BL) 和法线 (NL) 子样本,我们发现 BL SNe Ia 的平均亮度比 NL 的要暗,这可能是它们金属丰度不同的结果。然而,基于对两个子样本环境的像素统计研究,我们没有发现BL和NL SNe Ia的环境存在任何显着的潜在差异,这意味着SNe Ia的爆炸机制可能与其祖先种群无关。
Abstract. Although type Ia supernovae (SNe Ia) are very important in many astrophysical fields, such as cosmology, their explosion mechanisms and progenitor systems still remain unclear. In physics, the relative equivalent width (REW) of the Si ii 635.5 nm absorption feature reflects the velocity interval of the silicon in the SN ejecta, which may then provide constraints on the explosion mechanisms of SNe Ia. In this paper, we divide the SNe Ia into broad-line (BL) and normal-line (NL) subsamples, based on the REW of the Si ii 635.5 nm absorption lines around their maximum lights, and we find that the BL SNe Ia have a dimmer mean brightness than the NL ones, which is possibly a result of their different metallicities. However, based on a pixel statistics study of the environments of the two subsamples, we do not find any significant potential differences in the environments of the BL and NL SNe Ia, which implies that the explosion mechanisms of SNe Ia could be independent of their progenitor populations.
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