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arXiv 2510.03396astro-ph.HEastro-ph.SR
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双HeCO白矮星并合中单次氦爆轰产生的暗弱超新星与超高速逃逸白矮星

Faint supernovae and hyper-runaway white-dwarfs from single He-detonation in double HeCO-white-dwarf mergers

Technion - Israel Institute of Technology(以色列理工学院);California Institute of Technology(加州理工学院)

Hila Glanz, Hagai B. Perets, Aakash Bhat

AI总结:

通过三维流体动力学模拟,研究双HeCO白矮星并合的氦爆轰过程,发现其可产生暗弱快速演化的热核瞬变,或解释部分暗弱超新星,还可能形成高速PG-1159型恒星,拓展了对白矮星并合的认知。

摘要:

我们开展了低质量混合HeCO白矮星(WDs)并合的三维流体动力学模拟,为热核瞬变事件的多样性提供了新见解。与此前研究的大质量HeCO白矮星和CO白矮星并合(氦爆轰常触发核心点火)不同,我们的模拟显示,质量相当的低质量白矮星对会发生不完整的氦壳爆轰,产生由中等质量元素和放射性同位素(如$^{48}$Cr、$^{52}$Fe)抛射驱动的暗弱、快速演化瞬变,无显著$^{56}$Ni生成。这类瞬变可能在即将开展的宽场巡天中被探测到,或可解释部分暗弱热核超新星。并合遗迹的长期演化表明,该过程可能形成高速PG-1159型恒星,与普通CO-CO白矮星并合类似。本研究拓展了我们对白矮星并合及其核合成与恒星演化意义的理解。

英文摘要:

We present three-dimensional hydrodynamical simulations of mergers between low-mass hybrid HeCO white dwarfs (WDs), offering new insights into the diversity of thermonuclear transients. Unlike previously studied mergers involving higher-mass HeCO WDs and CO WDs, where helium detonation often triggers core ignition, our simulations reveal incomplete helium shell detonations in comparable-mass, lower-mass WD pairs. The result is a faint, rapidly evolving transient driven by the ejection of intermediate-mass elements and radioactive isotopes such as $^{48}$Cr and $^{52}$Fe, without significant $^{56}$Ni production. These transients may be detectable in upcoming wide-field surveys and could account for a subset of faint thermonuclear supernovae. Long-term evolution of the merger remnant shows that high-velocity PG-1159-type stars might be formed through this scenario, similar to normal CO-CO white dwarf mergers. This work expands our understanding of white dwarf mergers and their implications for nucleosynthesis and stellar evolution.

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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