Rare cosmic bow shock discovered in Milky Way's white dwarf system

Astronomers have spotted a rare cosmic phenomenon in the Milky Way, roughly 730 light-years from Earth. A white dwarf star, paired with a red dwarf companion, is generating a striking bow shock as it moves through space. The discovery reveals an unusual interaction between the two stars, unseen in other known systems.

The white dwarf sits in the constellation Auriga, bound by gravity to its smaller companion. Together, they complete an orbit every 80 minutes. The red dwarf, just a tenth of the sun's mass, feeds gas into the white dwarf's powerful magnetic field.

This transfer of material releases bursts of energy and radiation. As the white dwarf ploughs through interstellar gas, it creates a glowing shockwave. Images from the Very Large Telescope show the bow shock shining in vivid colours, heated by the collision.

The white dwarf itself packs a sun's worth of mass into a body barely larger than Earth. Its movement and the shockwave's shape suggest the process has lasted at least 1,000 years. No other white dwarf with such a structure has been observed before.

The system's discovery provides a unique case study of stellar interactions. The bow shock's longevity and brightness offer clues about the white dwarf's behaviour over centuries. Further observations may reveal more about how such extreme systems evolve.