Tomasz Nowakowski is a member of the physics.org community.
Astronomers have conducted multi-wavelength observations of a Type IIn supernova known as the SN 2017hcc. The results of the campaign were published on arXiv.org.
A stellar explosion called a nova is powerful and Luminous. They offer important clues into the evolution of stars and the universe. The two groups are based on their atomic spectrum. The type I and type II have hydrogen in their spectrum.
They show narrow optical emission lines. The light seen here on Earth comes mostly from interactions between the stars and dense material surrounding them.
On Oct 2, 2017, the Asteroid Terrestrial–impact Last Alert System (ATLAS) detected a type I In SN. An absolute peak magnitude of 20.7 mag is at a distance of some 243 million light years. The peak bolometric luminosity of 1.34 tredecillion erg/s was found to be one of the most Luminous SNe IIn ever found.
After the explosion of the Karl G. Jansky Very Large Array, a team of astronomy led by Poonam Chandra of the National Radio Astronomy Observatory in Virginia began observing it using NASA's Chandra, Spitzer and Swift satellites. The campaign gave important information about the properties and evolution of the supernova.
The late time emission dominates the energy distribution. The supernova had a very high bolometric luminosity, but it was not visible in X-rays or radio waves. The X-ray to total luminosity ratio was found to be lower than expected.
The early properties suggest that there was a shock that broke into a dense mass loss region. The mass-loss rate obtained at 30 days was less than the one at few hundred days. The results show that there was an enhanced mass-loss event a decade before the explosion.
The explosion is believed to have taken place years before. The researchers explained that the fine tuning between an LBV undergoing enhanced mass-loss and an explosion is an important issue.
The authors of the paper said that further studies of the SNe could help advance our knowledge.
More information: Poonam Chandra, Roger A. Chevalier, Nicholas J. H. James, Ori D. Fox, The luminous Type IIn supernova SN 2017hcc: Infrared bright, X-ray and radio faint. arXiv:2210.03212v1 [astro-ph.HE], arxiv.org/abs/2210.03212There is a science network.
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