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arXiv 2101.09792astro-ph.HE
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探索Ia型超新星双爆轰爆炸的多样性:爆炸后氦壳层成分的影响

Exploring the diversity of double detonation explosions for type Ia supernovae: Effects of the post-explosion helium shell composition

M. R. Magee, K. Maguire, R. Kotak, S. A. Sim

摘要:

碳氧白矮星顶部氦壳层的爆炸被认为是Ia型超新星(SNe~Ia)的一种潜在爆炸机制。氦壳燃烧时产生的灰烬会导致光变曲线和光谱与正常的SNe~Ia不一致,但对于一些在爆炸后几天内显示光变曲线凸起的天体来说可能是可行的。我们提出了一系列的辐射转移模型,旨在模拟预测从双爆轰爆炸模型。我们考虑了一系列的核心和壳质量,并系统地探索多种爆炸后的氦壳组合物。我们发现,各种亮度和早期光变曲线凸点的时间尺度的结果,从这些模型的外壳含有$^{56}$镍,$^{52}$铁,或$^{48}$铬。将我们的模型与具有光变曲线凸起的SNe~Ia进行比较,我们发现这些模型可以再现几乎所有观测到的凸起的形状,但是只有那些在最大光附近具有红色的物体($B-V \gtrsim 1$)在它们的演化过程中很好地匹配。与以前的工作相一致,我们还表明,这些模型中的壳不包含铁族元素提供良好的协议与正常SNe~Ia不同的光度从爆炸后不久,最大的光。虽然我们的模型并不等于积极的证据,有利于双爆轰的情况下,我们表明,提供氦壳灰不含铁族元素,它可能是可行的范围广泛的正常SNe~Ia。

英文摘要:

The detonation of a helium shell on top of a carbon-oxygen white dwarf has been argued as a potential explosion mechanism for type Ia supernovae (SNe~Ia). The ash produced during helium shell burning can lead to light curves and spectra that are inconsistent with normal SNe~Ia, but may be viable for some objects showing a light curve bump within the days following explosion. We present a series of radiative transfer models designed to mimic predictions from double detonation explosion models. We consider a range of core and shell masses, and systematically explore multiple post-explosion compositions for the helium shell. We find that a variety of luminosities and timescales for early light curve bumps result from those models with shells containing $^{56}$Ni, $^{52}$Fe, or $^{48}$Cr. Comparing our models to SNe~Ia with light curve bumps, we find that these models can reproduce the shapes of almost all of the bumps observed, but only those objects with red colours around maximum light ($B-V \gtrsim 1$) are well matched throughout their evolution. Consistent with previous works, we also show that those models in which the shell does not contain iron-group elements provide good agreement with normal SNe~Ia of different luminosities from shortly after explosion up to maximum light. While our models do not amount to positive evidence in favour of the double detonation scenario, we show that provided the helium shell ash does not contain iron-group elements, it may be viable for a wide range of normal SNe~Ia.

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