Researchers from the University of Copenhagen have identified that neutrino flavor transformation plays a critical role in determining the final fate of massive stars. While stars typically end their lives as supernovae or collapse into black holes, the specific mechanism behind this divergence has remained a significant astrophysical question.
Neutrinos carry away approximately 99% of the energy during core collapse. If sufficient energy is deposited behind the shock wave, a supernova occurs; otherwise, the star collapses into a black hole. The team developed a simplified model to simulate 195 stars with masses ranging from 9 to 120 solar masses to test these interactions.
The simulations revealed that for stars between 16 and 30 solar masses, neutrino flavor conversion can prevent a supernova, leading instead to direct black hole formation. This mechanism may help resolve the 'supernova deficit problem,' where observed supernova counts are lower than theoretical predictions.
By accounting for these 'failed supernovae'—stars that collapse without visible explosions—scientists hope to bridge the gap between theoretical models and actual astronomical observations. Understanding these processes is essential for tracing the origins of heavy elements that form planets and life.
