FAILED-DETONATION SUPERNOVAE: SUBLUMINOUS LOW-VELOCITY Ia SUPERNOVAE AND THEIR KICKED REMNANT WHITE DWARFS WITH IRON-RICH CORES
FAILED-DETONATION SUPERNOVAE: SUBLUMINOUS LOW-VELOCITY Ia SUPERNOVAE AND THEIR KICKED REMNANT WHITE DWARFS WITH IRON-RICH CORES
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DOI：
10.1088/2041-8205/761/2/l23
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发表时间：
2012-08
期刊：
影响因子：
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通讯作者：
G. Jordan;H. Perets;R. Fisher;D. V. van Rossum
中科院分区：
文献类型：
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作者：
G. Jordan;H. Perets;R. Fisher;D. V. van Rossum
Ia型超新星(SNE Ia)起源于碳氧(C-O)白矮星(WD)的热核爆炸。单简并情景是一个探索得很好的SNE Ia模型，其中不稳定的热核燃烧在一个吸积的钱德拉塞卡尔质量WD中启动，并形成一个前进的火焰。通过几个提出的物理过程，上升的、燃烧的材料触发爆炸，然后爆炸消耗并解开WD。然而，如果没有触发爆炸，并且爆燃太弱而不能解开恒星，则会出现完全不同的情况。我们探讨了SneIa的引力约束爆轰机制的失效，并通过二维和三维模拟论证了失败爆轰的SNE性质。我们发现，未爆轰超临界流体引爆装置排出几个0.1M☉的烧毁和部分烧毁的材料，一部分材料落回WD上，用中等质量元素和铁族元素污染残留的WD，这些元素可能偏析到核心，形成其核心富铁的WD。剩下的物质以与WD逃逸速度相当的速度不对称地喷出，作为响应，WD被踢到几百公里的S−1的速度。这些踢打可能会解开双星，射出失控/超高速的WD。虽然失败爆轰SN的能量和抛射质量只是典型热核SNE的一小部分，但它们很可能表现为亚发光的低速SNE Ia。因此，这种失败的爆炸可能解释了观察到的特殊SNE Ia的分支，或与之有关，例如低速亚发光SNE家族(SN 2002cx/SN 2008ha-like SNE)。
Type Ia supernovae (SNe Ia) originate from the thermonuclear explosions of carbon–oxygen (C–O) white dwarfs (WDs). The single-degenerate scenario is a well-explored model of SNe Ia where unstable thermonuclear burning initiates in an accreting, Chandrasekhar-mass WD and forms an advancing flame. By several proposed physical processes, the rising, burning material triggers a detonation, which subsequently consumes and unbinds the WD. However, if a detonation is not triggered and the deflagration is too weak to unbind the star, a completely different scenario unfolds. We explore the failure of the gravitationally confined detonation mechanism of SNe Ia, and demonstrate through two-dimensional and three-dimensional simulations the properties of failed-detonation SNe. We show that failed-detonation SNe expel a few 0.1 M☉ of burned and partially burned material and that a fraction of the material falls back onto the WD, polluting the remnant WD with intermediate-mass and iron-group elements that likely segregate to the core forming a WD whose core is iron rich. The remaining material is asymmetrically ejected at velocities comparable to the escape velocity from the WD, and in response, the WD is kicked to velocities of a few hundred km s−1. These kicks may unbind the binary and eject a runaway/hypervelocity WD. Although the energy and ejected mass of the failed-detonation SN are a fraction of typical thermonuclear SNe, they are likely to appear as subluminous low-velocity SNe Ia. Such failed detonations might therefore explain or are related to the observed branch of peculiar SNe Ia, such as the family of low-velocity subluminous SNe (SN 2002cx/SN 2008ha-like SNe).