Oral Presentation

Hydrodynamic Simulation of Dark Matter Admixed Accretion-Induced Collapse: Gravitational-wave Signals

Author(s): Shuai Zha, Ming-Chung Chu, Lap-Ming Lin (Department of Physics, the Chinese University of Hong Kong) Shing-Chi Leung (Kavli IPMU, the University of Tokyo)

Presenter: Shuai Zha (the Chinese University of Hong Kong)

The possible importance of dark matter (DM) on stellar structure, evolution and death has recently attracted attention. A previous study showed that dark matter admixture can reduce the effective Chandrasekhar mass limit of white dwarfs (WD) and result in sub-luminous type Ia supernovae (SNe Ia). Here we report on our research on the alternative death pathway of WDs reaching Chandrasekhar mass, i.e. accretion-induced collapse (AIC). We performed one-dimensional hydrodynamic simulations with neutrino transport of DM admixed AIC. The proto-neutron star has a smaller mass than the normal case (without DM) while the explosion energy and neutrino luminosity are just slightly weaker. We also performed two-dimensional simulations starting from initially rotating WDs. We identity the features in the gravitational-wave (g-wave) that could be altered by the DM admixture. Future detection of g-waves from AICs might help us to search for dark matter admixture in their progenitors.