IISc research reveals magnetic fields could allow white dwarfs to exceed mass limits

Researchers at the Indian Institute of Science (IISc) in Bangalore have proposed that strong magnetic fields could permit white dwarfs to exceed the Chandrasekhar limit, a fundamental threshold in astrophysics that has long been considered an upper bound on stellar mass.

The Chandrasekhar limit, approximately 1.4 times the mass of our Sun, represents the maximum mass a white dwarf can theoretically support before collapsing into a neutron star. This limit, established nearly a century ago, has been a cornerstone of our understanding of stellar evolution and the endpoints of massive stars.

The IISc study proposes that under conditions of exceptionally strong magnetic fields, white dwarfs may be able to resist gravitational collapse and continue accumulating matter beyond this traditionally accepted threshold. Such magnetic fields could provide additional pressure support that counteracts the relentless inward pull of gravity, allowing these dense stellar remnants to grow beyond conventional predictions.

This research has potential implications for understanding Type Ia supernovae and the binary star systems in which they occur. If white dwarfs can indeed exceed the Chandrasekhar limit under specific conditions, it could reshape models of stellar explosions and the cosmic processes by which heavy elements are distributed throughout the universe.

The findings add to growing evidence that magnetic fields play a more significant role in stellar physics than previously appreciated, particularly in extreme environments where matter reaches extraordinary densities and temperatures.