论文标题
来自中子星星合并的重元素和电磁瞬变
Heavy elements and electromagnetic transients from neutron star mergers
论文作者
论文摘要
涉及中子星的紧凑型二进制合并可以将其质量的一小部分弹出到空间上。这种材料非常富含中子，经历了快速中子捕获核合成，因此产生的放射性能力快速，短暂的电磁瞬变称为Kilonova或Macronova。这种瞬态是对最极端的物理状况的令人兴奋的探针，它们的观察表明，宇宙的富集充满了沉重的元素。在这里，我们回顾了我们目前对质量弹出机制，喷射的特性和产生的放射性瞬变的理解。 GW170817之后的第一个观察到的事件获得了很多见解，但是当今有关此类事件的大部分图片仍然基于理论研究的拼凑而成。除了总结当前的理解外，我们还指出了尚未达成共识的问题，我们勾勒出未来研究的可能方向。在附录中，我们描述了基于Winnet核反应网络的公开加热率库，并提供了一个简单的拟合公式来减轻流体动力模拟中的实现。
Compact binary mergers involving neutron stars can eject a fraction of their mass to space. Being extremely neutron rich, this material undergoes rapid neutron capture nucleosynthesis, and the resulting radioactivity powers fast, short-lived electromagnetic transients known as kilonova or macronova. Such transients are exciting probes of the most extreme physical conditions and their observation signals the enrichment of the Universe with heavy elements. Here we review our current understanding of the mass ejection mechanisms, the properties of the ejecta and the resulting radioactive transients. The first well-observed event in the aftermath of GW170817 delivered a wealth of insights, but much of today's picture of such events is still based on a patchwork of theoretical studies. Apart from summarizing the current understanding, we also point out questions where no consensus has been reached yet, and we sketch possible directions for the future research. In an appendix, we describe a publicly available heating rate library based on the WinNet nuclear reaction network, and we provide a simple fit formula to alleviate the implementation in hydrodynamic simulations.
