作为银河系$^7$Li产生源及潜在吸积诱导坍缩前身星的氧氖经典新星流体动力学模拟
Hydrodynamic Simulations of Oxygen-Neon Classical Novae as Galactic $^7$Li Producers and Potential Accretion Induced Collapse Progenitors
AI总结：
本研究使用NOVA代码模拟氧氖白矮星上的经典新星热核失控过程，发现抛射物中7Be大量富集，表明经典新星是银河系7Li的重要来源，且白矮星质量因抛射少于吸积而增长，可能成为吸积诱导坍缩事件的重要通道。
摘要：
我们报告了经典新星（CN）爆炸的研究，在其中我们追踪了氧氖（ONe）白矮星（WDs）上热核失控（TNRs）的演化。使用一维流体动力学计算机代码NOVA，我们吸积太阳物质直到TNR正在进行，然后切换为混合成分。这种方法受到WDs中TNRs的多维研究结果的指导，这些研究发现，在TNR充分进行之后，会与WD核心物质发生充分的混合，并达到与CN抛射物丰度观测相符的CNONeMg元素富集水平。由于吸积物质的量与氧丰度成反比，通过首先吸积太阳物质，吸积物质的量比那些初始就具有富集成分的模拟更大。我们改变了WD的质量（从0.6 Msun到1.35 Msun）以及混合物质的成分。我们的结果显示，抛射气体中7Be大量富集，这意味着ONe CNe和CO CNe（Starrfield et al. 2020）可能对银河系7Li（约1000 Msun）的很大一部分（约100 Msun）负有责任。我们讨论了CN爆炸中22Na和26Al的产生以及我们模拟预测的伽马射线发射。在我们所有的模拟中，WDs抛射的物质少于它们吸积的物质，我们预测WD的质量由于CN爆发而不断增长。因此，ONe CNe可能是吸积诱导坍缩（AIC）事件的一个重要通道。
英文摘要：
We report on studies of Classical Nova (CN) explosions where we follow the evolution of thermonuclear runaways (TNRs) on oxygen-neon (ONe) white dwarfs (WDs). Using NOVA, a one-dimensional hydrodynamic computer code, we accrete Solar matter until the TNR is ongoing and then switch to a mixed composition. This approach is guided by the results of multi-dimensional studies of TNRs in WDs which find that sufficient mixing with WD core material occurs after the TNR is well underway, and levels of enrichment of the CNONeMg elements are reached that agree with observations of CN ejecta abundances. Because the amount of accreted material is inversely proportional to the oxygen abundance, by first accreting Solar matter, the amount of accreted material is larger than in those simulations with an initially enriched composition. We vary the mass of the WD (from 0.6 Msun to 1.35 Msun) and the composition of the mixed materials. Our results show large enrichments of 7Be in the ejected gases implying that ONe CNe and CO CNe (Starrfield et al. 2020) may be responsible for a significant fraction (about 100 Msun) of the galactic 7Li ( about 1000 Msun). The production of 22Na and 26Al in CN explosions and the gamma-ray emission predicted by our simulations is discussed. The WDs in all our simulations eject less material than they accrete and we predict that the WD is growing in mass as a consequence of the CN outburst. ONe CNe, therefore, may be an important channel for accretion induced collapse (AIC) events.
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