A white dwarf—the collapsed core of a star that has run out of fuel—has been caught producing a powerful shock wave, even though it lacks the disk of infalling material that usually powers such emissions. The finding, reported by ScienceDaily, challenges existing models of how dead stars release energy.
The shock wave has persisted for at least 1,000 years, according to the report. While the star's magnetic field may contribute to the phenomenon, astronomers say an unexplained 'mystery engine' could also be responsible. No known mechanism fully accounts for the observed behavior.
The discovery suggests that white dwarfs may have more complex energy sources than previously thought. Further observations are needed to determine what is driving the shock wave and whether similar events occur elsewhere in the galaxy.