Astronomers Witness Star’s Direct Collapse into Black Hole in Andromeda Galaxy
In a groundbreaking observation, astronomers have documented a massive star in the Andromeda galaxy collapsing directly into a black hole without the typical supernova explosion. This rare event, observed over several years, provides unprecedented insight into the formation of black holes and challenges existing theories about stellar death.
The star, designated M31-2014-DS1, is located approximately 2.5 million light-years away in the Andromeda galaxy. Researchers, led by Kishalay De of the Flatiron Institute, initially noticed the star’s increasing brightness in infrared light in 2014. However, by 2016, its luminosity plummeted, becoming virtually invisible in optical and near-infrared wavelengths. Further measurements between 2022 and 2023 confirmed the star’s dramatic fading, detectable only in mid-infrared with a luminosity ten thousand times lower than its original state. The findings were published in the journal Science.
“This star used to be one of the most luminous in the Andromeda galaxy, and suddenly it wasn’t there,” explained De. “Imagine if Betelgeuse disappeared overnight, it would be a scandal.”
Unlike most massive stars that end their lives in spectacular supernova explosions, M31-2014-DS1 underwent a “direct collapse,” bypassing the supernova phase entirely. This phenomenon, long theorized but rarely observed, offers a unique opportunity to study the process of black hole formation. The observation provides some of the strongest evidence to date that “failed supernovae” can indeed produce stellar-mass black holes.
The research team analyzed data collected by NASA’s NEOWISE project and other ground- and space-based telescopes, including the Hubble Space Telescope, spanning from 2005 to 2023. They utilized a prediction from the 1970s suggesting that a direct collapse would abandon behind a faint infrared glow as the star’s outer layers dissipated and were enveloped in dust. According to reports, this discovery was “probably the most surprising of my life” for De.
The team’s findings, which include scientists from the Simons Foundation, MIT, and universities including Harvard, Princeton, and Columbia, are reshaping our understanding of how black holes are created. As reported by Sinc, the event involved a massive, hydrogen-depleted supergiant star.
This observation marks a significant advancement in astrophysics, offering a rare glimpse into the final moments of a star’s life and the birth of a black hole. The ability to witness such an event provides valuable data for refining models of stellar evolution and black hole formation, furthering our understanding of the universe’s most enigmatic objects.
