TORONTO -- Scientists out of England believe that a 鈥溾�� discovery they thought was one star could actually be two stars merging.
An artist鈥檚 impression of the scientific discovery depicting a small white-hot star colliding with a larger one has been dubbed a 鈥�.鈥�
鈥�(Scientists) have discovered an unusual ultra-massive white dwarf around 150 light years from us with an atmospheric composition never seen before,鈥� wrote a University of Warwick spokesperson in a press release. The mass, named WDJ0551+4135, is estimated to be two-thirds the size of Earth but heavier than the sun.
The discovery, published Monday in the journal , is 鈥渢he first time that a merged white dwarf has been identified using its atmospheric composition as a clue.鈥�
Researchers analyzed data pulled from the European Space Agency鈥檚 Gaia telescope and the William Herschel Telescope to determine that this particular 鈥渨hite dwarf鈥� star had an abnormally high level of carbon in its atmosphere. White dwarfs are left after a star like the sun burns out and sheds its outer layer. This star was nearly twice the average mass of a typical white dwarf star and moved faster than most nearby white dwarfs, which suggested it was older than others. When white dwarfs merge, the process occurs over billions of years, the Warwick press release said.
鈥淭his star stood out as something we had never seen before,鈥� said Mark Hollands, from the University of Warwick Department of Physics. 鈥淲e have a composition that we can鈥檛 explain through normal stellar evolution, a mass twice the average for a white dwarf, and a kinematic age older than that inferred from cooling. We鈥檙e pretty sure of how one star forms one white dwarf and it shouldn鈥檛 do this. The only way you can explain it is if it was formed through a merger of two white dwarfs.鈥�
