论文标题
白矮人冷却期间的霓虹灯簇形成和相位分离
Neon Cluster Formation and Phase Separation During White Dwarf Cooling
论文作者
论文摘要
最近对Gaia的银河白矮人（WDS）的观察结果表明，有大量结晶的WDS表现出异常冷却 - Q分支。虽然单粒子$^{22} $ ne沉淀长期以来一直被认为是一种可能的热源，但最近的工作表明$^{22} $ ne必须分离为簇，增强扩散，以使沉降以在观察到的时间表上提供加热。我们确定地表明，$^{22} $ ne不能使用分子动力学模拟在C/O WD中形成簇，我们进一步提出了一般的C/O/NE相图，表明强$^{22} $ ne富集无法实现$^{22} $ ne Abrundance $ ne bardance $ \ ne LifeSim $ \ \ ne Libssim 30 30 30 \％\％。我们得出的结论是，异常的加热不能归因于$^{22} $ ne集群沉积，并且Q分支WDS可能具有异常的成分，可能具有较重的元素。
Recent observations of Galactic white dwarfs (WDs) with Gaia suggest there is a population of massive crystallizing WDs exhibiting anomalous cooling -- the Q branch. While single-particle $^{22}$Ne sedimentation has long been considered a possible heat source, recent work suggests that $^{22}$Ne must separate into clusters, enhancing diffusion, in order for sedimentation to provide heating on the observed timescale. We show definitively that $^{22}$Ne cannot separate to form clusters in C/O WDs using molecular dynamics simulations, and we further present a general C/O/Ne phase diagram showing that strong $^{22}$Ne enrichment is not achievable for $^{22}$Ne abundance $\lesssim 30\%$. We conclude that the anomalous heating cannot be due to $^{22}$Ne cluster sedimentation and that Q branch WDs may have an unusual composition, possibly rich with heavier elements.
