The increase in the sensitivity of gravitational wave (GW) interferometers will bring additional detections of binary black hole (BBH) and double neutron star (NS) mergers. It will also very likely add many merger events of BH–NS binaries. Distinguishing mixed binaries from BBHs mergers for high mass ratios could be challenging because in this situation the NS coalesces with the BH without experiencing significant disruption. To investigate the transition of mixed binary mergers into those behaving more like BBH coalescences, we present results from merger simulations for different mass ratios. We show how the degree of deformation and disruption of the NS impacts the inspiral and merger dynamics, the properties of the final BH, the accretion disk formed from the circularization of the tidal debris, the GWs, and the strain spectrum and mismatches. The results also show the effectiveness of the initial data method that generalizes the Bowen–York initial data for BH punctures to the case of binaries with NS companions.

引力波 (GW) 干涉仪灵敏度的提高将带来对双黑洞 (BBH) 和双中子星 (NS) 并合的额外探测。它也很可能会增加许多 BH-NS 二进制文件的合并事件。将混合双星与 BBH 合并的高质量比区分开来可能具有挑战性，因为在这种情况下，NS 与 BH 合并而不会遇到重大中断。为了研究混合二元合并向行为更像 BBH 合并的转变，我们提供了不同质量比的合并模拟结果。我们展示了 NS 的变形和破坏程度如何影响螺旋和合并动力学、最终 BH 的特性、潮汐碎片环化形成的吸积盘、GW 以及应变谱和不匹配。