“We found something never seen before” – A dead star is producing a shock wave that shouldn’t exist

Date: September 24, 2026 Source: ESO Summary: A dead white dwarf with no detectable disk has somehow produced a powerful shock wave that appears to have persisted for at least 1,000 years. Its magnetic field may be partly responsible, but astronomers say an unexplained “mystery engine” may also be at work. Share: Facebook Twitter Pinterest LinkedIN Email FULL STORY The central square image, taken with the MUSE instrument on ESO’s Very Large Telescope, shows shock waves around the dead star RXJ0528+2838. When a star moves through space, it can push away nearby material, creating a so-called bow shock, which in this image is glowing in red, green, and blue. The colors represent hydrogen, nitrogen and oxygen, respectively. These shocks are usually produced by a strong outflow expelled from the star. However, in the case of RXJ0528+2838 –– a white dwarf with a Sun-like companion –– astronomers discovered that the shock wave can’t be explained . Some hidden energy source, perhaps magnetic fields, could be the answer to this mystery. Background: PanSTARRS Stars can produce powerful shock waves when gas and dust streaming away from them collide with material in the surrounding space. Astronomers have now captured a striking example around the dead star RXJ0528+2838 using the European Southern Observatory's Very Large Telescope (ESO's VLT). The discovery is puzzling because, based on known mechanisms, this small stellar remnant should not be capable of producing the structure seen around it. The unexpected finding challenges current ideas about how dead stars exchange matter and energy with their surroundings. "We found something never seen before and, more importantly, entirely unexpected," says Simone Scaringi, associate professor at Durham University, UK and co-lead author of the study published in Nature Astronomy. "Our observations reveal a powerful outflow that, according to our current understanding, shouldn't be there," says Krystian Ilkiewicz, a postdoctoral researcher at the Nicolaus Copernicus Astronomical Center in Warsaw, Poland and study co-lead. Astronomers use the term 'outflow' to describe material expelled from an object in space. A Shock Wave Around a Dead Star RXJ0528+2838 lies about 730 light-years from Earth. Like the Sun and other stars, it travels around the center of the Milky Way. As it moves through space, it encounters gas between the stars, producing a type of shock wave known as a bow shock. Noel Castro Segura, research fellow at the University of Warwick in the UK and collaborator in this study, describes it as "a curved arc of material, similar to the wave that builds up in front of a ship." Bow shocks are typically produced when material flowing away from a star slams into its surroundings.