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首页> 外文期刊>PASJ: Publications of the Astronomical Society of Japan >Revealing progenitors of type Ia supernovae from their light curves and spectra
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Revealing progenitors of type Ia supernovae from their light curves and spectra

机译：从其光曲线和光谱中揭示Ia型超新星的祖细胞

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In the single degenerate (SD) scenario of type Ia supernovae (SNe Ia), the collision of the ejecta with its companion results in stripping hydrogen-rich matter from the companion star. This hydrogen-rich matter might leave its trace in the light curves and/or spectra. In this paper, we perform radiation hydrodynamical simulations of this collision for three binary systems. As a result, we find that the emission from the shock-heated region is not as strong as in previous studies. This weak emission, however, may be a result of our underestimation of the coupling between the gas and radiation in the shock interaction. Therefore, though our results suggest that the observed early light curves of SNeIa cannot rule out a binary system with a short separation as the progenitor system, more elaborate numerical studies will be needed to reach a fair conclusion. Alternatively, our results indicate that the feature observed in the early phase of a recent type Ia SN2014J might result from interaction of the ejecta with a red giant companion star. We also discuss the dependence of spectral features of H alpha and Si II absorption lines on viewing angles and investigate whether they can constrain the event rate of the SD progenitor.
机译：在Ia型超新星（SNe Ia）的单一简并（SD）场景中，喷射流与其伴星的碰撞导致从伴星中剥离出富氢物质。这种富氢物质可能会在光曲线和/或光谱中留下痕迹。在本文中，我们对三个二元系统进行了该碰撞的辐射流体动力学模拟。结果，我们发现冲击加热区域的发射不如以前的研究那么强烈。但是，这种微弱的发射可能是由于我们低估了冲击相互作用中气体与辐射之间的耦合。因此，尽管我们的结果表明观察到的SNeIa早期光曲线不能排除作为分离祖先系统的短距离二元系统，但仍需要进行更详尽的数值研究才能得出合理的结论。另外，我们的结果表明，在最近型Ia SN2014J的早期阶段观察到的特征可能是由喷射器与红色巨星伴星相互作用造成的。我们还讨论了H alpha和Si II吸收线的光谱特征对视角的依赖性，并研究它们是否可以限制SD祖细胞的事件发生率。

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