Accretion-induced Collapse of Dark Matter-admixed Rotating White Dwarfs: Dynamics and Gravitational-wave Signals

Abstract

We present two-dimensional hydrodynamic simulations of the accretion-induced collapse (AIC) of rotating white dwarfs admixed with an extended component of dark matter (DM) comprising of sub-GeV degenerate fermionic DM particles. We find that the DM component would follow the collapse of the normal matter (NM) component to become a bound DM core. Thus, we demonstrate how a DM-admixed neutron star could form through DM-admixed AIC (DMAIC) for the first time, with the dynamics of DM taken into account. The gravitational-wave (GW) signature from the DMAIC shows distinctive features. In the diffusive DM limit, the DM admixture indirectly suppresses the post-bounce spectral peak of the NM GWs. In the compact DM limit, the collapse dynamics of the DM in a Milky Way event generate GWs that are strong enough to be detectable by Advanced LIGO as continuous low-frequency ($<1000$ Hz) signals after the NM core bounce. Our study not only is the first-ever computation of GW from a collapsing DM object but also provides the key features to identify DM in AIC events through future GW detections.

14 pages, 13 figures

References in corpus (16)

• A direct empirical proof of the existence of dark matter
• GW190814: Gravitational Waves from the Coalescence of a 23 M${}_{\odot }$ Black Hole with a 2.6 M${}_{\odot }$ Compact Object
• Constraining the Galaxy's dark halo with RAVE stars
• Compact stars made of fermionic dark matter
• Constraints on Bosonic Dark Matter From Observations of Old Neutron Stars
• Dark matter admixed neutron star as a possible compact component in the GW190814 merger event
• Tidal Deformability of Dark Matter Admixed Neutron Stars
• A massive white-dwarf merger product before final collapse
• On the evolution of rotating accreting white dwarfs and type Ia supernovae
• Accretion-Induced Collapse From Helium Star + White Dwarf Binaries
• Discovery of a hot ultramassive rapidly rotating DBA White Dwarf
• Radio transients from accretion-induced collapse of white dwarfs
• The formation of single neutron-stars from double white-dwarf mergers via accretion-induced collapse
• Formation of millisecond pulsars with long orbital periods by accretion-induced collapse of white-dwarfs
• Asymmetric Dark Matter Imprint on Low-mass Main-sequence Stars in the Milky Way Nuclear Star Cluster
• Effects of dark matter in star formation

Cited by in corpus (1)

• Rotating dark matter admixed neutron stars