论文标题
白矮人潮汐破坏事件中热核启动的分辨率研究
Resolution Study of Thermonuclear Initiation in White Dwarf Tidal Disruption Events
论文作者
论文摘要
我们研究了中间质量（$ 10^3 m_ \ odot $）黑洞的潮汐破坏白矮星星中热核爆炸的启动。在三维中，不容易达到解决起始机制所需的长度尺度，因此我们设计了二维代理模型，这些模型与对数格栅策略一起可以很好地捕获爆炸波阵列，因为材料经受同时压缩和从潮汐力而伸展的材料。我们考虑0.15和0.6太阳质量白色矮人星星通过潮汐强度在$β= 4〜 \ text {to} 〜23 $的范围内参数化。高空间分辨率阐明了导致热核爆炸的方式和条件，将起始序列与恒星组成和潮汐强度联系起来。我们所有的模型都遭受持续的爆发，这是由绝热压缩，轻度热核预处理和碰撞加热的组合触发的，这主要取决于潮汐强度。我们发现，沿着轨道平面的规模高度，在10公里以下的分辨率下，许多诊断（例如温度，总释放的能量和铁组产品）相当良好（大于10％）。例外是中间质量瞬变，例如钙，即使在1 km分辨率下，钙仍然不确定两个因素。
We study the initiation of thermonuclear detonations in tidally disrupted white dwarf stars by intermediate-mass ($10^3 M_\odot$) black holes. The length scales required to resolve the initiation mechanism are not easily reached in three-dimensions, so instead we have devised two-dimensional proxy models which, together with a logarithmic gridding strategy, can adequately capture detonation wave fronts as material undergoes simultaneous compression and stretching from tidal forces. We consider 0.15 and 0.6 solar mass white dwarf stars parameterized by tidal strengths in the range $β=4~\text{to}~23$. High spatial resolution elucidates the manner and conditions leading to thermonuclear detonation, linking the initiation sequence to stellar composition and tidal strength. All of our models suffer sustained detonations triggered by a combination of adiabatic compression, mild thermonuclear preconditioning, and collisional heating, in degrees depending primarily on tidal strength. We find many diagnostics, such as temperature, total released energy, and iron group products, are fairly well-converged (better than 10%) at resolutions below 10 km along the scale height of the orbital plane. The exceptions are intermediate mass transients like calcium, which remain uncertain up to factors of two even at 1 km resolution.
