论文标题
分辨率对IA型超新星的双重测量模型的影响
The Impact of Resolution on Double-Detonation Models for Type Ia Supernovae
论文作者
论文摘要
热核超新星是白矮人剧烈解开的结果，但是爆炸机制的确切性质是主动争论的问题。为此，已经提出了几种特定情况来解释SNE IA的可观察性特征。有前途的途径是双重测量的情况，其中白矮人从伴侣中吸收了富含氦气的材料的外壳，而所产生的氦壳中的爆炸是爆炸的主要原因。通过一组基于二维网格的模拟，我们清楚地区分了进化的三个阶段：外部富含氦气的爆炸，核心压缩加热和最终的核心碳燃烧。尽管在所有分辨率上都实现了整个系统的最终破坏，但只有最低分辨率为4〜km并更好地展示所有三个阶段的模型。特别是，仅观察到较高分辨率的核心压缩加热，从而产生质子合成的质量不同。我们确定了较细的空间分辨率对引爆氦层与基础C/O WD之间界面中热硅混合的影响，这是这些动态差异的主要驱动力。
Thermonuclear supernovae are the result of the violent unbinding of a white dwarf, but the precise nature of the explosion mechanism(s) is a matter of active debate. To this end, several specific scenarios have been proposed to explain the observable traits of SNe Ia. A promising pathway is the double-detonation scenario, where a white dwarf accretes a shell of helium-rich material from a companion and a detonation in the resulting helium shell is the primary cause of the explosion. Through a set of two-dimensional grid-based simulations of this scenario we clearly distinguish three phases of evolution: external helium-rich detonation, core compressive heating, and a final core carbon burn. Though final disruption of the whole system is achieved at all resolutions, only models with minimum resolutions of 4~km and better exhibit all three phases. Particularly, core compression heating is only observed for higher resolutions, producing qualitatively different nucleosynthetic outcomes. We identify the effect of finer spatial resolution on the mixing of hot silicon at the interface between the detonating helium layer and the underlying C/O WD as a primary driver of these dynamic differences.
