A study of Si II and S II features in spectra of Type Ia supernovae

A study of Si II and S II features in spectra of Type Ia supernovae
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Ia型超新星光谱中Si II和S II特征的研究

DOI:
10.1093/mnras/staa3985
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发表时间:
2021-04
影响因子:
4.8
通讯作者:
Sai Hanna
Sai Hanna
中科院分区:
物理与天体物理2区
文献类型:
--
作者:
Zhao Xulin;Maeda Keiichi;Wang Xiaofeng;Sai Hanna

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我们研究了大样本Ia型超新星(λλIa)的SiIW4130、5972、6355和SiW槽的光谱特征。我们发现,在SNE Ia的NV(法向速度)子类中,除了Siiλ5972外,这些特征往往在最大光附近达到最大谱线强度。具有较高激发能量的光谱特征,如SiiW槽,相对较弱,具有相对较低的速度。具有较大ΔM15(B)的SneIa往往具有较低的速度,特别是在最大光后的相位。随着ΔM15(B)的增加,NVSNE呈现出增强的趋势,而91T/99aA类SNE呈现出相反的趋势。在接近最大光强时,SiIλ5972的吸收深度与ΔM15(B)的相关性最强,而在早期,SiIλλ4130和5972的吸收深度之和与ΔM15(B)的相关性最强。速度和线强度之间的总体相关性是正的,但在NV SNE中,这种相关性是负的或不相关的,具体取决于相位。在正常SNE Ia(包括高速SNE)中,长波特征与短波特征的速度差和深度比随ΔM15(B)的增大而增大。这些结果大部分可以用原子物理学很好地解释,但一些谜团仍然存在,可能与饱和、线竞争或其他因素的影响有关。
We studied the spectral features of Siiiλλ4130, 5972, 6355 and the SiiW-trough for a large sample of Type Ia supernovae (SNe Ia). We found that in the NV (normal-velocity) subclass of SNe Ia, these features tend to reach a maximum line strength near maximum light, except for Siiiλ5972. Spectral features with higher excitation energy, such as the SiiW-trough, are relatively weak and have a relatively low velocity. SNe Ia with larger Δm15(B) tend to have lower velocities, especially at phases after maximum light. NV SNe show a trend of increasing line strength with increasing Δm15(B), while 91T/99aa-like SNe show an opposite trend. Near maximum light, the absorption depth of Siiiλ5972 shows the strongest correlation with Δm15(B), while at early times the sum of the depths of Siiiλλ4130 and 5972 shows the strongest correlation with Δm15(B). The overall correlation between velocity and line strength is positive, but within NV SNe the correlation is negative or unrelated, depending on the phase. In normal SNe Ia (including the high-velocity SNe), the velocity difference and depth ratio of a longer-wavelength feature to a shorter-wavelength feature tend to increase with increasing Δm15(B). These results are mostly well explained with atomic physics, but some puzzles remain, possibly related to the effects of saturation, line competition or other factors.
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