Universality of the turbulent magnetic field in hypermassive neutron stars produced by binary mergers

Understand

The detection of a binary neutron star merger in 2017 through both gravitational waves and electromagnetic emission opened a new era of multimessenger astronomy.

• The understanding of the magnetic field amplification triggered by the Kelvin-Helmholtz instability during the merger is still a numerically unresolved problem because of the relevant small scales involved.
• One of the uncertainties comes from the simplifications usually assumed in the initial magnetic topology of merging neutron stars.
• We perform high-resolution, convergent large-eddy simulations of binary neutron star mergers, following the newly formed remnant for up to $30$ milliseconds.