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- W4385965804 abstract "Fallback in core-collapse supernova explosions is potentially of significant importance for the birth spins of neutron stars and black holes. It has recently been pointed out that the angular momentum imparted onto a compact remnant by fallback material is subtly intertwined with its kick because fallback onto a moving neutron star or black hole will preferentially come for a conical region around its direction of travel. We show that contrary to earlier expectations such one-sided fallback accretion onto a neutron star will tend to produce spin-kick misalignment. Since the baroclinic driving term in the vorticity equation is perpendicular to the nearly radial pressure gradient, convective eddies in the progenitor as well as Rayleigh-Taylor plumes growing during the explosion primarily carry angular momentum perpendicular to the radial direction. Fallback material from the accretion volume of a moving neutron star therefore carries substantial angular momentum perpendicular to the kick velocity. We estimate the seed angular momentum fluctuations from convective motions in core-collapse supernova progenitors and argue that accreted fallback material will almost invariably be accreted with the maximum permissible specific angular momentum for reaching the Alfv'en radius. This imposes a limit of $mathord{sim}10^{-2}M_odot$ of fallback accretion for fast-spinning young neutron stars with periods of $mathord{sim}20,mathrm{ms}$ and less for longer birth spin periods." @default.
- W4385965804 created "2023-08-18" @default.
- W4385965804 creator A5061104637 @default.
- W4385965804 date "2023-08-16" @default.
- W4385965804 modified "2023-09-29" @default.
- W4385965804 title "Fallback onto Kicked Neutron Stars and its Effect on Spin-Kick Alignment" @default.
- W4385965804 doi "https://doi.org/10.1093/mnras/stad2881" @default.
- W4385965804 hasPublicationYear "2023" @default.
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