Massive Star WOH G64's Evolutionary Status Reassessed
Recent observations suggest that WOH G64, a massive star in the Large Magellanic Cloud, remains a red supergiant, challenging previous beliefs of its imminent supernova explosion.
WOH G64, a colossal red supergiant located approximately 160,000 light-years away in the Large Magellanic Cloud, has been the subject of recent astronomical studies. Previously thought to be transitioning into a yellow hypergiant—a phase often preceding a supernova—new findings indicate that the star remains in its red supergiant stage.
Between November 2024 and December 2025, researchers utilized the Southern African Large Telescope (SALT) to observe WOH G64. Their spectroscopic analysis detected titanium oxide in the star's atmosphere, a molecule characteristic of cooler red supergiants. This discovery suggests that WOH G64 has not undergone the expected transformation into a hotter yellow hypergiant.
The study proposes that WOH G64 may be part of a binary system, with a smaller companion star interacting gravitationally. This interaction could be causing the observed mass loss and the formation of a surrounding dusty cocoon, without necessitating a change in the primary star's classification.
These findings challenge earlier assumptions about WOH G64's imminent explosion and highlight the complexities of stellar evolution in massive stars. Continued monitoring is essential to understand the future trajectory of this celestial giant.