© NASA, ESA, and P. Jeffries and A. Feild (STScI)
Several exploding stars have been found outside the cozy confines of galaxies, where most stars reside. These wayward supernovae are also weird because they exploded billions of years before their predicted detonations. Using archived observations from several telescopes, astronomers have developed a theory for where these doomed stars come from and how they arrived at their current homes. A new analysis of 13 supernovae — including archived data from NASA’s Hubble Space Telescope — is helping astronomers explain how some young stars exploded sooner than expected, hurling them to a lonely place far from their host galaxies.
It’s a complicated mystery of double-star systems, merging galaxies, and twin black holes that began in 2000 when the first such supernova was discovered, according to study leader Ryan Foley, University of Illinois at Urbana-Champaign. “This story has taken lots of twists and turns, and I was surprised every step of the way,” he said. “We knew these stars had to be far from the source of their explosion as supernovae and wanted to find out how they arrived at their current homes.”
Foley thought that the doomed stars had somehow migrated to their final resting spots. To prove his idea, he studied data from the Lick Observatory in California and the W. M. Keck Observatory and the Subaru Telescope, both in Hawaii, to determine how fast the stars were traveling. To his surprise, he discovered that the doomed stars were zipping…