paper

Accretion-Induced Collapse of Dark Matter Admixed White Dwarfs -- I: Formation of Low-mass Neutron Stars

arXiv:1908.05102 · doi:10.3847/1538-4357/ab3b5e

Abstract

Recently observed pulsars with masses challenge the conventional neutron star (NS) formation path by core-collapse supernova (CCSN). Using spherically symmetric hydrodynamics simulations, we follow the collapse of a massive white dwarf (WD) core triggered by electron capture, until the formation of a proto-NS (PNS). For initial WD models with the same central density, we study the effects of a static, compact dark matter (DM) admixed core on the collapse and bounce dynamics and mass of the PNS, with DM mass . We show that increasing the admixed DM mass generally leads to slower collapse and smaller PNS mass, down to about 1.0 . Our results suggest that the accretion-induced collapse of dark matter admixed white dwarfs can produce low-mass neutron stars, such as the observed low-mass pulsar J0453+1559, which cannot be obtained by conventional NS formation path by CCSN.

arXiv comment14 pages, 12 figures. Submitted to Astrophysical Journal at 9 July 2019, accepted at 13 August 2019, published at 7 October 2019. References and metadata updated

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