3D simulations of strongly magnetized non-rotating supernovae: explosion dynamics and remnant properties

Varma, Vishnu; Müller, Bernhard; Schneider, Fabian R N

Abstract

We investigate the impact of strong initial magnetic fields in core-collapse supernovae of non-rotating progenitors by simulating the collapse and explosion of a 16.9 M-circle dot star for a strong- and weak-field case assuming a twisted-torus field with initial central field strengths of approximate to 10(12) and approximate to 10(6) G. The strong-field model has been set up with a view to the fossil-field scenario for magnetar formation and emulates a pre-collapse field configuration that may occur in massive stars formed by a merger. This model undergoes shock revival already 100 ms after bounce and reaches an explosion energy of 9.3 x10(50) erg at 310 ms, in contrast to a more delayed and less energetic explosion in the weak-field model. The strong magnetic fields help trigger a neutrino-driven explosion early on, which results in a rapid rise and saturation of the explosion energy. Dynamically, the strong initial field leads to a fast build-up of magnetic fields in the gain region to 40 per cent of kinetic equipartition and also creates sizable pre-shock ram pressure perturbations that are known to be conducive to asymmetric shock expansion. For the strong-field model, we find an extrapolated neutron star kick of approximate to 350 km s(-1), a spin period of approximate to 70 ms, and no spin-kick alignment. The dipole field strength of the proto-neutron star is 2 x10(14) G by the end of the simulation with a declining trend. Surprisingly, the surface dipole field in the weak-field model is stronger, which argues against a straightforward connection between pre-collapse fields and the birth magnetic fields of neutron stars.

Citation

Varma, V., Müller, B., & Schneider, F. R. N. (2022). 3D simulations of strongly magnetized non-rotating supernovae: explosion dynamics and remnant properties. Monthly Notices of the Royal Astronomical Society, 518(3), 3622-3636. https://doi.org/10.1093/mnras/stac3247

• Journal Article Type: Article
• Acceptance Date: Nov 4, 2022
• Online Publication Date: Nov 11, 2022
• Publication Date: Dec 1, 2022
• Deposit Date: May 30, 2023
• Journal: Monthly Notices of the Royal Astronomical Society
• Print ISSN: 0035-8711
• Electronic ISSN: 1365-2966
• Publisher: Oxford University Press
• Peer Reviewed: Peer Reviewed
• Volume: 518
• Issue: 3
• Pages: 3622-3636
• DOI: https://doi.org/10.1093/mnras/stac3247
• Keywords: Space and Planetary Science; Astronomy and Astrophysics