The researchers discovered this superluminous supernova, named DES14X3taz, in 2014 by examining data from theDark Energy Survey. DES14X3taz is located about 6.4 billion light-years from Earth.
Using the Gran Telescopio Canarias, a telescope in Spain's Canary Islands, the team of astronomers carried out follow-up observations shortly after DES14X3taz was first detected. This helped the researchers to see how the supernova's temperature evolved over time.
The researchers saw that after the initial spike of brightness, the object rapidly cooled off. Another, more powerful burst of brightness followed.
The initial spike of brightness likely coincided with the dying star's ejection of a huge bubble of material into outer space. The star's mass was about 200 times that of the sun, and the mass of the bubble of expelled material was about equivalent to the sun's, the researchers estimated. This bubble of expelled material cooled rapidly as it grew, they said.
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Following the initial spike in brightness, this supernova gave birth to a magnetar, the researchers said. Magnetars are among the most powerful magnets in the universe. They are a kind of neutron star, which is the leftover core of material in a dead massive star. To reach this conclusion about the magnetar birth, the researchers compared the data with several physical models of supernovas.
The explosion created by the magnetar's formation heated up the bubble expelled by the first explosion, leading to the second, more powerful burst of brightness, the researchers found.
However, the researchers said that their most surprising discovery was "not that the supernova had a double peak, but that there's significant evidence that most superluminous supernovae do, too," Smith told Space.com.
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Previous research of past superluminous supernovas suggested "these astrophysical objects are all highly similar, and thus presumably, one explosion mechanism can explain them all," Smith said.
The research team's analysis of other superluminous supernovas does indeed suggest that double peaks "may be intrinsic to all superluminous supernovae," Smith said.
"The hunt is now on to find these events early and really tie down what causes them," Smith said. "Fingers crossed we find some more."
The scientists detailed their findings online July 26 in The Astrophysical Journal Letters.
Original story on Space.com.
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