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The merging of double white dwarfs (WDs) may produce the events ofaccretion-induced collapse (AIC) and form single neutron stars (NSs).Meanwhile, it is also notable that the recently proposed WD+He subgiantscenario has a significant contribution to the production of massive doubleWDs, in which the primary WD grows in mass by accreting He-rich material from aHe subgiant companion. In this work, we aim to study the binary populationsynthesis (BPS) properties of AIC events from the double WD mergers byconsidering the classical scenarios and also the contribution of theWD+Hesubgiant scenario to the formation of double WDs. First, we provided a denseand large model grid of WD+He star systems for producing AIC events through thedouble WD merger scenario. Secondly, we performed several sets of BPScalculations to obtain the rates and single NS number in our Galaxy. We foundthat the rates of AIC events from the double WD mergers in the Galaxy are inthe range of 1.4-8.9*10^-3 yr^-1 for all ONe/CO WD+ONe/CO WD mergers, and inthe range of 0.3-3.8*10^-3 yr^-1 when double COWD mergers are not considered.Wealso found that the number of single NSs from AIC events in our Galaxy mayrange from 0.328*10^7 to 1.072*10^8. The chirp mass of double WDs for producingAIC events distribute in the range of 0.55-1.25 Msun. We estimated that morethan half of doubleWDs for producing AIC events are capable to be observed bythe future space-based gravitational wave detectors.

The formation of single neutron-stars from double white-dwarf mergers via accretion-induced collapse