arXiv 2103.062772021-03-10astro-ph.SR

He-爆轰引发大质量混合HeCO白矮星的热核爆炸

Thermonuclear explosion of a massive hybrid HeCO white-dwarf triggered by a He-detonation on a companion

Ruediger Pakmor, Yossef Zenati, Hagai B. Perets, Silvia Toonen

备注：: 14 pages, 10 figures, accepted by MNRAS, comments welcome
DOI：: 10.1093/mnras/stab686

摘要：

正常的Ia型超新星（SNe）被认为是由大质量（$>0.8$ M $_\odot$）碳氧白矮星（WD）的热核爆炸产生的，尽管确切的机制还存在争议。在一些模型中，氦吸积到一个碳氧（CO）WD从伴星被建议动态触发爆炸的吸积氦壳。氦爆炸然后产生冲击波，该冲击波在靠近CO-WD的核心处会聚在其自身上之后，触发二次碳爆炸并引起高能爆炸。然而，这种情况下的大多数研究已经完成了在一个或两个维度，和/或没有考虑自洽的吸积和氦供体的模型。在这里，我们利用详细的三维模拟研究的相互作用的富氦混合$0.69\,\mathrm{M_\odot}$ HeCO WD与更大量的$0.8\,\mathrm{M_\odot}$ CO~WD。我们发现，从混合WD到CO~WD的吸积引起氦爆轰。然而，氦爆轰并不触发CO~WD中的碳爆轰。相反，氦爆炸燃烧通过吸积流，也燃烧供体混合HeCO-WD的氦壳。其巨大的氦壳爆炸，然后压缩其CO核心，并触发其爆炸和完全破坏。爆炸产生了一个微弱的，可能是高度变红的瞬变，可能是由维拉鲁宾调查观察到的，以及高速（$\sim 1000\,\mathrm{km s^{-1}}$）喷射的加热幸存的CO~WD伴星。由于恒星演化的不确定性，我们估计这种瞬变的速率高达Ia SNe型速率的$\sim10\%$。

英文摘要：

Normal type Ia supernovae (SNe) are thought to arise from the thermonuclear explosion of massive ($>0.8$ M$_\odot$) carbon-oxygen white dwarfs (WDs), although the exact mechanism is debated. In some models helium accretion onto a carbon-oxygen (CO) WD from a companion was suggested to dynamically trigger a detonation of the accreted helium shell. The helium detonation then produces a shock that after converging on itself close to the core of the CO-WD, triggers a secondary carbon detonation and gives rise to an energetic explosion. However, most studies of such scenarios have been done in one or two dimensions, and/or did not consider self-consistent models for the accretion and the He-donor. Here we make use of detailed 3D simulation to study the interaction of a He-rich hybrid $0.69\,\mathrm{M_\odot}$ HeCO WD with a more massive $0.8\,\mathrm{M_\odot}$ CO~WD. We find that accretion from the hybrid WD onto the CO~WD gives rise to a helium detonation. However, the helium detonation does not trigger a carbon detonation in the CO~WD. Instead, the helium detonation burns through the accretion stream to also burn the helium shell of the donor hybrid HeCO-WD. The detonation of its massive helium shell then compresses its CO core, and triggers its detonation and full destruction. The explosion gives rise to a faint, likely highly reddened transient, potentially observable by the Vera Rubin survey, and the high-velocity ($\sim 1000\,\mathrm{km s^{-1}}$) ejection of the heated surviving CO~WD companion. Pending on uncertainties in stellar evolution we estimate the rate of such transient to be up to $\sim10\%$ of the rate of type Ia SNe.

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。

摘要：

英文摘要：

相关论文