One hundred million light years away from Earth, an unusual supernova explodes.
The exploding star — known as the “supernova LSQ14fmg” —is discovered by a 37-member international research team at Faraway, led by Florida State University Assistant Professor of Physics Eric Hisiao. His research, which was published in Astrophysical Journal, Helps uncover the origin of a group of supernovae belonging to this star.
The characteristics of this supernova — it accelerates very slowly, and is one of the brightest explosions in its orbit — are opposite to each other.
“It was a truly unique and strange phenomenon, and our explanation for it is equally interesting,” said the paper’s lead author, Hsiao.
Exploding Star is the one known as Type IA Supernova, and more specifically, a member of the “Super-Chandrasekhar” group.
Stars go through a kind of life cycle, and these supernovae are the end of the explosion of some stars with low mass. They are so powerful that they shape the evolution of galaxies, and so bright that we can see them even in half the universe from Earth.
Type Ia supernovas were important tools for discovery known as dark energy, a name given to unknown energies that caused the current accelerated expansion of the universe. Despite their importance, astronomers knew little about the origin of these supernova explosions, other than that they are thermonuclear explosions of white dwarf stars.
But the research team knew that light of a type Ia supernova would rise and fall over the course of weeks, driven by the radioactive decay of the nickel produced in the explosion. A supernova of that type intensifies as the nickel becomes more exposed, then faints as the supernova cools and the nickel reaches cobalt and iron.
After collecting data with binoculars in Chile and Spain, the research team noticed that the supernova was killing some material around it, leaving more light in it as well as rotting nickel. He also saw evidence that carbon monoxide was being produced. Those observations led to his conclusion – a supernova exploding inside what was an odd tactile branch (AGB) star on its way to becoming a planet nebula.
FSU doctoral candidate and paper co-author Jing Lu said, “It is very exciting to see how the observation of this interesting phenomenon agrees with the theory.”
They proved that the explosion of the core merged with the AGB star and triggered another white dwarf star within it. The central star was losing an abundant amount of mass through a stellar wind before the mass loss was abruptly stopped and a ring of material formed around the star. Soon after the supernova burst, it affected a ring of material often seen in planetary nebulae and produced additional light and saw a slow glow.
“This is the first strong observational evidence that a Type Ia supernova can explode in the AGBB or proto-planetary-nebula system and is an important step in understanding the origin of a Type Ia supernova,” Hsiao said. “These supernovas can be particularly disturbing because they can be found in samples of common supernovas used to study dark energy. This research gives us a better understanding of the potential origins of type Ia supernovas and Very deep energy will help improve research. ”
A new light is shining on the development of supernovas
EY Hsiao et al, Carnegie Supernova Project II: Clues to the Origin of the Slowest Rising Type Ia Supernova LSQ14fmg and Super-Chandrasekhar / 03fg-like Events: The Astrophysical Journal (2020). DOI: 10.3847 / 1538-4357 / abaf4c
Provided by Florida State University
Quotes: The research team recovered the unique supernova explosion (2020, 10 September) from https://phys.org/news/2020-09-team-unique-supernova-explosion.html by 10 September 2020.
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