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The supernova, which is presumed to be much rarer.



Faulty identity: the presumed supernova was a much rarer

Credit: Carnegie Institution for Science

In the case of the cartoon’s erroneous identity, an international team of astronomers revealed that what they once thought to be a supernova is a periodic flare from galaxies where supermassive black holes provide explosive energy every 1

14 days. As it tore off a piece of the star’s orbit.


Six years after the first discovery, reported in The Astronomer’s Telegram by Carnegie’s Thomas Holoien, led by Anna Payne of the University of Hawai’i at Mānoa, it can be said that the phenomenon they observed is termed ASASSN-14ko. A recurring flare occurs from the galactic center, more than 570 million light-years away, in the southern constellation Pictor.

Their findings, based on 20 regular eruptions, are published in Journal of Astrophysics And presented by Payne at the annual meeting of the American Astronomical Society.

Active galaxies, such as the ASASSN-14ko host, have an unusually bright, variable center. These objects produce more energy than the total star involvement. Astrophysicists think this is due to the gravitational force and friction that causes the swirling disks of gas and dust that accumulate around the central supermassive black hole. Black holes gradually consume material, which generates low-level random changes emitted by the disk.

This is the first clear example of such a machine behavior from an active galaxy. Sporadic flares, such as those from ASASSN-14ko, may be evidence of an elusive cosmic phenomenon observed by earlier theorists.

“Knowing Old Faithful’s out-of-this-world schedule allows us to coordinate and study more details,” Payne said.

ASASSN-14ko was first detected by the All-Sky Automated Survey for Supernovae (ASAS-SN), a global network of 20 robotic telescopes headquartered at The Ohio State University (OSU) in Columbus when Payne. Check out all the ASAS-SN data on this phenomenon.She has observed 17 regularly spaced firework.

Based on this discovery, astronomers predicted that the galaxy would explode again on May 17 of last year and coordinate ground and space facilities for observation. Since then, they have successfully predicted and seen the fireworks on September 7 and December 26.

“ASAS-SN was designed to investigate the physics of our universe, looking for transient and variable events,” Holoien said. “It’s exciting to see the luminous object we used to think of as a supernova explosion. Which is interesting in and of itself But something more common, it turns out to be a cosmic event that has long been in demand. ”

So what is the cause of the repeat fireworks? The team looked at several possible explanations. But I think the most likely one is the so-called partial tidal interruption.

The tidal disruption, or TDE, occurs when a star gets too close to a supermassive black hole, causing it to tear to shreds. Some of the material was thrown into space and the rest fell back to the black hole, forming a disk of hot and bright gas when used.

In this case, instead of the star being obliterated by interacting with the black hole, it will slowly dissipate in each orbit. A flare occurs when a missing object with a mass equal to three times the mass of Jupiter each cycle falls into the black hole.

Astronomers are not sure how long the fireworks will last. Stellar masses cannot be lost forever, and while scientists can estimate the amount of mass lost in each orbit, it is impossible to lose mass. But they don’t know the mass in the beginning.

“We plan to continue to anticipate and observe these bursts, or as long as possible,” said Benjamin Shappee, second author from UH Mānoa (and a Carnegie alumnus). Reveal new details about black hole physics ”


NASA mission helps investigate galaxies that operate ‘Old Faithful’


More information:
ASASSN-14ko is a periodic nuclear transient in ESO 253 – G003 arXiv: 2009.03321. [astro-ph.HE] arxiv.org/abs/2009.03321

Offered by Carnegie Institution for Science.

Reference: Misidentification: A supernova that is presumed to be much rarer (2021, January 13) .Retrieved January 13, 2021 from https://phys.org/news/2021-01-mistaken-identity. -presumed-supernova-rarer.html

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