AI Insight
White dwarfs, the dense stellar remnants left after dying stars shed their outer layers, have traditionally been thought to have a maximum mass of approximately 1.4 solar masses, known as the Chandrasekhar limit. New research suggests that strong magnetic fields could allow white dwarfs to exceed this long-established theoretical boundary. This challenges a fundamental principle in stellar astrophysics that has been accepted for nearly a century.
Why it matters
This finding could explain observations of unusually massive white dwarfs that have puzzled astronomers and may require revisions to models of stellar evolution and Type Ia supernovae. Understanding how white dwarfs can exceed the Chandrasekhar limit has implications for using these objects as standard candles in measuring cosmic distances.
Understand the Science
When a dying star runs out of fuel and sheds its outer layers, its remaining core can become an approximately Earth-sized, extremely dense stellar remnant called a white dwarf. For a white dwarf that is not strongly rotating or magnetized, there is a well-known upper mass limit of about 1.4 times the mass of the sun, known as the Chandrasekhar limit.
Source: Strong magnetic fields could allow white dwarfs to grow beyond the Chandrasekhar limit