Long-term evolution of a magnetic massive merger product

Understand

About 10% of stars more massive than ${\approx}\,1.5\,\mathrm{M}_\odot$ have strong, large-scale surface magnetic fields and are being discussed as progenitors of highly-magnetic white dwarfs and magnetars.

• The origin of these fields remains uncertain.
• Recent 3D magnetohydrodynamical simulations have shown that strong magnetic fields can be generated in the merger of two massive stars.
• Here, we follow the long-term evolution of such a 3D merger product in a 1D stellar evolution code.