论文标题
来自宽白色矮人的IA超新星类型
Type Ia Supernovae from wide white-dwarfs triples
论文作者
论文摘要
对于超宽系统（外部轨道> $ 10^{3} {\ rm au}）$，银河场是碰撞的。因此，Flyby Stars可以使超大的三重白堤（TWD）受到扰动，以使外偏高的偏心足够高，从而使三重变成动态不稳定。不稳定的三重速度在所有三个WD之间遭到多个二进制谐振。这些相遇可能会导致任何随机两个WD之间的直接碰撞，并导致IA型超新星（SN）事件。如果多个谐振遭遇没有产生碰撞，则形成紧凑的二进制（而第三个WD被弹出），该二进制会通过重力波发射碰撞或合并，类似于经典的双基因（DD）通道。在这项研究中，我们估计直接碰撞渠道IA型SN的银河系速率为$ 0.1 \％-4 \％$，主要是$ 2 \％-36 \％$从DD方案中。
For ultra-wide systems (with outer orbit >$10^{3}{\rm AU})$ the galactic field is collisional. Hence, ultra-wide triple white-dwarfs (TWDs) can be perturbed, by flyby stars, to sufficiently high outer eccentricity such that the triple becomes dynamically unstable. An unstable triple undergoes multiple binary-single resonant encounters between all three WDs. These encounters might result in a direct collision between any random two WDs and lead to a Type Ia supernova (SN) event. In case where the multiple resonant encounters did not produce a collision a compact binary is formed (while the third WD is ejected), this binary either collides or merges via gravitational wave emission, similar to the classic double-degenerate (DD) channel. In this research study we estimate the galactic rates of Type Ia SN from the direct collision channel is to be $0.1\%-4\%$ and primarily $2\%-36\%$ from the DD scenario.
