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Type Ia supernovae (SNe Ia) play a crucial role as standardizablecosmological candles, though the nature of their progenitors is a subject ofactive investigation. Recent observational and theoretical work has pointed tomerging white dwarf binaries, referred to as the double-degenerate channel, asthe possible progenitor systems for some SNe Ia. Additionally, recenttheoretical work suggests that mergers which fail to detonate may producemagnetized, rapidly-rotating white dwarfs. In this paper, we present the firstmultidimensional simulations of the post-merger evolution of white dwarfbinaries to include the effect of the magnetic field. In these systems, the twowhite dwarfs complete a final merger on a dynamical timescale, and are tidallydisrupted, producing a rapidly-rotating white dwarf merger surrounded by a hotcorona and a thick, differentially-rotating disk. The disk is stronglysusceptible to the magnetorotational instability (MRI), and we demonstrate thatthis leads to the rapid growth of an initially dynamically weak magnetic fieldin the disk, the spin-down of the white dwarf merger, and to the subsequentcentral ignition of the white dwarf merger. Additionally, these magnetizedmodels exhibit new features not present in prior hydrodynamic studies of whitedwarf mergers, including the development of MRI turbulence in the hot disk,magnetized outflows carrying a significant fraction of the disk mass, and themagnetization of the white dwarf merger to field strengths $\sim 2 \times 10^8$G. We discuss the impact of our findings on the origins, circumstellar media,and observed properties of SNe Ia and magnetized white dwarfs.

astrophysical journal/the astrophysical journal

The Post-Merger Magnetized Evolution of White Dwarf Binaries: The  Double-Degenerate Channel of Sub-Chandrasekhar Type Ia Supernovae and the  Formation of Magnetized White Dwarfs