标题： 以短延迟时间演变为Ia型超新星 显示英文标题

标题： Evolving to Type Ia Supernovae with Short Delay Times

摘要： 当前，单简并模型是I型超新星（SNe Ia）的有利前身星模型。对单简并模型的白矮星+氦星通道的最新研究暗示，该通道在产生SNe Ia方面值得注意。在本文中，我们通过详细的双星种群合成方法研究了该通道的SNe Ia诞生率和延迟时间。我们发现，根据我们的标准模型，银河系中来自白矮星+氦星通道的SNe Ia诞生率为$\sim 0.3\times 10^{-3} {\rm yr}^{-1}$，并且该通道可以解释延迟时间较短的SNe Ia（$\sim4.5\times10^7 - 1.4\times10^8$ yr）。同时，这些白矮星+氦星系统可能在SNe Ia爆发前与年轻的超软X射线源有关。 显示英文摘要

摘要： The single-degenerate model is currently a favourable progenitor model for Type Ia supernovae (SNe Ia). Recent investigations on the WD + He star channel of the single-degenerate model imply that this channel is noteworthy for producing SNe Ia. In this paper we studied SN Ia birthrates and delay times of this channel via a detailed binary population synthesis approach. We found that the Galactic SN Ia birthrate from the WD + He star channel is $\sim 0.3\times 10^{-3} {\rm yr}^{-1}$ according to our standard model, and that this channel can explain SNe Ia with short delay times ($\sim4.5\times10^7 - 1.4\times10^8$ yr). Meanwhile, these WD + He star systems may be related to the young supersoft X-ray sources prior to SN Ia explosions.