An extremely unusual supernova that exploded twice

As a general rule, when the star enters the stage of the supernova, an explosion occurs and ... in fact, it ends. However, the new discovery of astronomers can force us to reconsider our concept of how the stars die. Scientists discovered a star entering the supernova stage, bursting, somehow escaping the event, and then bursting again 60 years later. For space researchers, this shift of events turned out to be very unusual. Simply because it should not be.

The supernova, named iPTF14hls, was discovered in 2014, and for the first time researchers looked like a very ordinary Super -ova class II. The supernovae of this layer represent the nuclei of the giant stars that turn into a neutron star and create a powerful shock wave that passes through its outer, hydrogen-rich outer space. The neglected material is ionized by the shock wave, then cooled and then unified.

The observable spectral properties in the IPTF14hls seem to be identical with the II-P supernovae. But a few months later, she showed behavior that does not usually show another supernova - as she said again, they say.

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During the 600-day observation period, it fell several times, then became brighter again. In less than three years, at least 5 such cases have been registered. Typically the maximum maximum brightness reaches maximum brightness, shine for several months, then begin to fade permanently. However, when scientists from the Las Cumbres Observatory (USA) returned to study the archived data, they discovered something surprising - the same supernova exploded in 1954.

"This supernova denies everything we know about these things - that's the biggest puzzle I have encountered in almost a decade of research in the collapse of stars," says astronomer Yair Arkoy of the University of California at Santa Barbara and his colleagues. Note Las Cumbres.

In the journal Nature, researchers cite computations that were initially supernova iPTF14hls a larger star, at least 50 times greater than our sun, and probably much more.

    "In fact, the supernova iPTF14hls could be the biggest explosion of a star ever seen," said Lars Feldstein, director of the Institute of Theoretical Physics at California State University.

The astronomer believes that the potential interpretation of the iPTF14hls could be a greater velocity than the unstable supernova, making it the first such object of its kind to be detected. This happened to unleash a huge amount of stellar material, which may at first sight appear to be a greater mystery, but without destroying the star.

According to scientists, this phenomenon is possible only with large-mass stars 95-130 times the solar mass. During these emissions, the star transmits the outer layer, reducing its solar mass from 10 to 25. It can be repeated until the star eventually collapses into a black hole. But that's just an assumption. As a former candidate for the role of the greatest unstable stable unstable, this star Kiel was considered. According to the scientists, there was an 1843 expelling of the material on it, but researchers have not yet been able to ascertain that the star belongs to this class.

    "Similar explosions can be expected in the stars early in the universe, but they are certainly not now, as if we discovered a real living dinosaur today." If they do, they may ask themselves: Is this a dinosaur? , Andy Howell, of the University of California, who leads the team on the study and study of supernovae, comments.

The puzzle seems to be close to the solution. But everything is not as simple as we want. The fact is, the hypothesis does not take into account the presence of hydrogen in an unstable supernova. After the explosion in 1954, IPTF14s kept the hydrogen in a shell in several dozen sun blocks. In addition, in a subsequent explosion of supernovae, energy was several times higher than that described in the hypothesis of super unstable unstable precipitation. Two conclusions can be drawn from this: either iPTF14hls is already the greatest unstable accelerator, but it is at the same time very unfamiliar, or it is a completely different kind of supernovae unprecedented than before.

The team continues to monitor this supernova, hoping to be able to find the right answer at the right time.

    "This is one of those kinds of events, through which you literally break your head." At first, we thought it was completely natural and completely unfamiliar, and then it became brighter, and that brightness did not change from month to month. " Says researcher Peter Nugent of the Lawrence National Laboratory in Berkeley.

    "By collecting all the data from our observations from the Palomar Observatory, the Cake Observatory, the Las Combs Observatory and even the images obtained through the Palomar Review of 1954, we will be able to reach the bottom of it."

    "I really want to discover something else at least," he said.

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