Astronomers have discovered a surprising reason for the sudden disappearance of a massive star located in the Kinman Dwarf galaxy. The star was situated approximately 75 million light years away from Earth and was known for its bright blue glow. However, in 2019, researchers found that it was no longer visible.
An international team of scientists led by PhD student Andrew Allan of Trinity College Dublin, Ireland, have now published a study in the Monthly Notices of the Royal Astronomical Society, providing possible explanations for the star’s disappearance. The team initially believed that the star had collapsed into a black hole without producing a supernova explosion, a rare event that has not been directly observed in the universe so far. However, subsequent research has led them to a different conclusion.
The star, which was 2.5 million times brighter than the Sun, was observed between 2001 and 2011, and it demonstrated signs of nearing the end of its life. This particular type of star, known as a luminous blue variable, is known to undergo dramatic shifts in their spectra and brightness, even though they’re relatively rare.
The research team used the European Southern Observatory’s Very Large Telescope (VLT) based in Chile to look for the star in 2019, but they couldn’t find it. They then turned to older data collected by the VLT between 2002 and 2009, as well as from other telescopes, to further investigate the star’s history.
According to the researchers, the star likely underwent a period of strong outbursts that resulted in the ejection of a lot of mass. These outbursts would have transformed the luminous blue variable into a less luminous star, which could then have been partially obscured by dust.
The team also suggested that the star might have collapsed into a black hole, but the absence of a supernova would make this a very rare event. The study concludes that the star’s disappearance might be due to a combination of these factors – a decrease in luminosity following outbursts, and a subsequent obscuring by dust.
This incident provides an interesting insight into the lifecycle of massive stars and the different paths they can take at the end of their lives. It also highlights the importance of continuous observation and the use of advanced telescopes in the field of astronomy. The team’s research could help astronomers predict and understand similar events in the future. The findings also underscore the need for further studies in this area, especially the possibility of a star collapsing into a black hole without a supernova explosion.
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