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arXiv 1709.00422astro-ph.HE
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WD-WD head-on collisions在孤立的三元组中的比率太低,无法解释标准的Ia型超新星

The rate of WD-WD head-on collisions in isolated triples is too low to explain standard type Ia supernovae

S. Toonen, H. B. Perets, A. S. Hamers

摘要:

Ia型超新星(Ia-SNe)被认为是由白矮星(WD)的热核爆炸产生的。这种爆炸的前身仍然是高度争论,特别是在WD中导致爆炸的条件在大多数建议的前身模型中没有得到很好的理解。然而,两个WD的直接正面碰撞被证明会引起爆炸,并产生类似Ia-SNe的爆炸,并被认为是可能的祖先。在致密的球状星团中,这种碰撞的速率远低于观测到的Ia型超新星的速率,但有人认为,等级三元组的准长期演化可能会产生很高的碰撞速率。在这里,我们使用详细的三重恒星演化人口的合成模型耦合动力学长期演化计算的WD-WD碰撞率在三重和他们的性质。我们探索了一系列具有不同实际初始条件的模型,并推导出每个模型的预期SNe总质量,质量比和延迟时间分布。我们发现,从WD WD碰撞的SNe率是0.1%的顺序观察到的Ia-SNe率在我们所有的模型,延迟时间分布几乎是均匀的时间,是不一致的观测。我们的结论是,从WD WD碰撞在孤立的三重态的SNe最多可以提供一小部分的Ia-SNe,并不能作为这种爆炸的主要祖先。

英文摘要:

Type Ia supernovae (Ia-SNe) are thought to arise from the thermonuclear explosions of white dwarfs (WDs). The progenitors of such explosions are still highly debated; in particular the conditions leading to detonations in WDs are not well understood in most of the suggested progenitor models. Nevertheless, direct head-on collisions of two WDs were shown to give rise to detonations and produce Ia-SNe - like explosions, and were suggested as possible progenitors. The rates of such collisions in dense globular clusters are far below the observed rates of type Ia SNe, but it was suggested that quasi-secular evolution of hierarchical triples could produce a high rate of such collisions. Here we used detailed triple stellar evolution populations synthesis models coupled with dynamical secular evolution to calculate the rates of WD-WD collisions in triples and their properties. We explored a range of models with different realistic initial conditions and derived the expected SNe total mass, mass-ratio and delay time distributions for each of the models. We find that the SNe rate from WD-WD collisions is of the order of 0.1% of the observed Ia-SNe rate across all our models, and the delay-time distribution is almost uniform in time, and is inconsistent with observations. We conclude that SNe from WD-WD collisions in isolated triples can at most provide for a small fraction of Ia-SNe, and can not serve as the main progenitors of such explosions.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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