Impact of Magnetic Field on Thermal Instability

Magnetic fields can significantly enhance thermal instability (up to one order of magnitude) in gravitationally stratified medium, by suppressing internal gravity waves and supporting cold filaments against gravity. The physics involved here can help us to understand the formation of cool gas in circumgalactic medium, intracluster medium, and other circumstances involved with thermally unstable plasmas. (Ji et al., in prep)

Efficiency of Magnetic Field Amplification at Shocks

This project investigates the interaction between shocks and magneto hydrodynamic turbulence in astrophysical context (supernova remnants and galaxy cluster outskirts), during which the shock propagating through turbulence amplifies magnetic field and changes the field topology. We find that in supernova remnants, field amplification by strong shocks is stretching dominated, producing radially biased field in downstream, while in clusters is weaker and mostly compressional, producing tangential fields, which is consistent with observations. (Ji et al., 2016)

Thermonuclear Explosions in Binary White Dwarf Mergers Driven by Spiral Instability

We examined the formation and development of spiral modes in the accretion disk of a super-Chandrasekhar binary white dwarf merger, which leads to a detonation on a dynamical timescale. This is the first work that demonstrates a detonation without artificial ignition on double-degenerate scenario of Type Ia supernovae. (Kashyap et al., 2015)

Post-merger Magnetized Evolution of White Dwarf Binaries

We investigated the magneto hydrodynamic evolution of white dwarf mergers, and found that an initially weak magnetic field is highly amplified by magnetorotational instability, and forms a high-field magnetic white dwarf with field strength of 1010 Gauss. This is the first work to explore in detail the possible influence of magnetic field on double-degenerate scenario of Type Ia supernovae. (Ji et al., 2013)