Four Indian Astronomers with Foreign Scientists Track Rare Supernova Explosion | India News


NEW DELHI: A team of four Indian astronomers, along with international collaborators, have tracked a rare supernova explosion and traced it to one of the hottest stars called Wolf-Rayet stars (Stars WR), which are objects of great luminosity a thousand times greater than Sun.
WR stars are massive stars and strip their outer hydrogen envelope, which is associated with the fusion of helium and other elements in the massive core. Tracking certain types of massive, luminous supernova explosions can help probe these stars that remain an enigma for scientists around the world.
The four Indian scientists from the Aryabhatta Observational Sciences Research Institute (ARIES), Nainital, an autonomous institute under the Department of Science and Technology, and 16 scientists from different institutes in the US, UK, Canada, Ireland, Italy, Sweden and Korea have carried out optical monitoring of a naked envelope supernova called SN 2015dj located in the galaxy NGC 7371. They calculated the mass of the star that collapsed to form the supernovae, as well as the geometry of its ejection. Scientists also discovered that the original star was a combination of two stars: one of them is a massive WR star and another is a star with much less mass than the Sun.
Talking to

TOI

from South Korea, Mridweeka Singh, who was part of ARIES when the supernova discovery was made, said: “This supernova was discovered in 2015. We observed the supernova for up to 170 days from its discovery. Thereafter, we submitted the manuscript in February of last year and it was accepted on January 22 of this year. The document is now available online and is being published. ”
Mridweeka, who moved to South Korea in 2019 after leaving the institute and currently works for the Korea Institute of Astronomy and Space Science, said

TOI

, “SN 2015dj is a type Ib supernova whose parent was in a binary system with mass between 13 and 20 M_sun. The geometry of the explosion was symmetrical for this supernova. “The team’s discovery and detailed study were recently published in ‘The Astrophysical Journal‘.
Supernovae (SNe) are highly energetic explosions in the universe that release an enormous amount of energy. Long-term monitoring of these transients opens the door to understanding the nature of the exploding star, as well as the exploding properties. It can also help to list the number of massive stars.
Long-term monitoring of these transients opens the door to understanding the nature of the exploding star, as well as the exploding properties. It can also help to list the number of massive stars.

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