论文标题
氦积聚诱导的热核超新星的弹出伴侣星的预测空间和速度分布
Predicted spatial and velocity distributions of ejected companion stars of helium accretion-induced thermonuclear supernovae
论文作者
论文摘要
热核超新星（SNE），其中一部分是非常重要的SNE型\，IA，仍然是现代天体物理学已知的较知之不得的现象之一。近年来，单个退化的氦（HE）供体通道，那里是白矮星（WD）从一个耗尽氢化的伴侣中吸收丰富的物质，已成为这些事件的有希望的候选祖细胞场景。在这种情况下，尚未解决的问题是同伴星的命运，在SN事件之后，这将是显而易见的热门小区（He sdo/b）。先前的研究表明，弹出伴侣的运动特性为仔细研究SN祖细胞系统的性质提供了机会。但是，由于观察到的对象的数量与理论上不匹配预测，因此该机制的可行性被质疑。在这项研究中，我们首先合成了由上述机制弹出的一批伴侣恒星，考虑到预测的弹出速度，推断出银河系（GAL。）质量分布中的种群密度以及随后的GAL运动学。潜在的。然后，我们讨论该人群的星体特性。我们提出$ 10^{6} $单个弹射轨迹，该轨迹是通过新开发的轻量级仿真框架计算的。预计在GAL的方向上预计关闭物体的密度分布中的峰值。中心。如果实现了整个考虑的质量范围，则径向速度分布应显示在500 \ kms处的峰值。如果仅关闭我们\，则考虑708个类似物，则应在（$ \ sim750-850 $）\ kms上有一个峰值。我们表明，令人困惑的缺乏已确认的热核SNE尚存的伴侣恒星，尽管可能是与观察相关的选择效果，但可能表明对SD供体通道中的高质量供体进行选择。 （-简略-）
Thermonuclear supernovae (SNe), a subset of which are the highly important SNe Type\,Ia, remain one of the more poorly understood phenomena known to modern astrophysics. In recent years, the single degenerate helium (He) donor channel, where a white dwarf star (WD) accretes He-rich matter from a hydrogen-depleted companion, has emerged as a promising candidate progenitor scenario for these events. An unresolved question in this scenario is the fate of the companion star, which would be evident as a runaway hot subdwarf (He sdO/B) in the aftermath of the SN event. Previous studies have shown that the kinematic properties of an ejected companion provide an opportunity to closer examination of the properties of an SN progenitor system. However, with the number of observed objects not matching predictions by theory, the viability of this mechanism is called into question. In this study, we first synthesize a population of companion stars ejected by the aforementioned mechanism, taking into account predicted ejection velocities, inferred population density in the Galactic (Gal.) mass distribution and subsequent kinematics in the Gal. potential. We then discuss the astrometric properties of this population. We present $10^{6}$ individual ejection trajectories, numerically computed with a newly developed, lightweight simulation framework. A peak in the density distribution for close objects is expected in the direction of the Gal. center. If the entire considered mass range is realized, the radial velocity distribution should show a peak at 500\kms. If only close US\,708 analogues are considered, there should be a peak at ($\sim750-850$)\kms. We show that the puzzling lack of confirmed surviving companion stars of thermonuclear SNe, though possibly an observation-related selection effect, may indicate a selection against high mass donors in the SD He donor channel. (-abridged-)
