Astronomers Unmask Supernova Impostor AT 2016blu

• A massive star, AT 2016blu, previously thought to be on the verge of a supernova, has been revealed as an binary system instead.
• Located 29 million light years away, the star is a Luminous Blue Variable (LBV) about 33 times more massive than the Sun.
• Since 2012, it has exhibited 27 periodic, supernova-like outbursts approximately every 113 days.

New Research and Findings

• Researchers, led by Mojgan Aghakhanloo at the University of Virginia, utilized the Chandra X-ray Telescope during a predicted outburst in March 2026.
• X-ray data from 2026 confirms the presence of an active source, which was absent in archived data from 2001-2002.
• The research concludes that the outbursts are caused by intermittent accretion of material from the massive star onto a compact companion, such as a black hole or neutron star.

Scientific Significance

• This discovery marks the first known instance of an LBV supernova impostor driven by accretion onto a compact object, identifying it as a high-mass X-ray binary.
• The findings suggest that many observed pre-supernova transients in massive stars may actually be explained by similar binary interactions.
• Expanding this sample is considered essential for understanding the evolutionary pathways and life cycles of the universe's most massive and consequential stars.