Chilean scientists discover crucial event right before the death of a star

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Credit: NAOJ

A new paper in the journal Nature Astronomy, The delay of shock breakout due to circumstellar material evident in most Type II Supernovae, written by a group of researchers from the Center for Mathematical Modeling (CMM) and the Department of Astronomy of the University of Chile, Millennium Institute of Astrophysics (MAS) and international institutions, sheds new light on supernova explosions.

The group discovered that supernovae generated from red supergiants, stars of great size in advanced stages of their lives, present a flash before the main explosion not predicted by current models. The discovery was made by scanning the sky using DECam for 14 nights at the 4-m Victor Blanco Telescope located at the National Science Foundation's Cerro Tololo – part of the AURA Observatory in Chile. The observations will change what is known about supernova explosions and the last stages of stellar evolution.

This brightness is explained by a collision between the expanding gas of the supernova and a material of unknown origin that surrounds the star, explained Francisco Förster, a researcher at the CMM and MAS leader of the research, "The presence of this material makes it possible to extract part of the enormous energy produced during the explosion and turn it into light that we can detect."

The discovery was made possible because the explosions were observed in real time in their initial stages. To do this the researchers used unique data analysis techniques developed in Chile and used for the first-time for Astronomy, machine learning, astrophysical models created in Japan and high-performance computing.

"This research is part of the work that the CMM performs around acquiring and structuring complex databases, formulating methodologies to make sense of these databases and interpreting the results," said Alejandro Maass, director of the Center for Mathematical Modeling. "It's undoubtedly a step forward in the challenges that data science brings to society, academia and industry."

According to Förster, the discovery will open new research avenues for the large telescopes that are being built in northern Chile, such as the Large Synoptic Survey Telescope, also funded by the National Science Foundation, which will sweep the entire sky every three nights. "This will enable us to collect more supernova samples, which will let us gain a better understanding of this phenomenon."

The Director of Cerro Tololo, Dr. Steve Heathcote commented, "This result shows how in the era of Big Data, the use of advanced computing techniques -a field that in Chile has been established with global capabilities in CMM- to filter massive data sets delivered by modern instruments such as DECam, allow scientific discoveries that would have been impossible in the past. The techniques developed at CMM will be critical tools to handle the large amount of data that will come from LSST when it starts operations in Chile in 2023."

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About AURA Observatory in Chile and Cerro Tololo

The Association of Universities for Research in Astronomy (AURA) is an international consortium of universities and non-profit institutions that operate world-class astronomy facilities. In Chile, it administers and operates the telescopes of Cerro Tololo, Gemini South, SOAR and the future LSST under a cooperative agreement with the National Science Foundation of the United States.

About DECam, (Dark Energy Camera)

DECam is a 570 megapixel camera, one of the most powerful that exists, capable of digitally capturing the light of more than 100,000 galaxies up to a distance of 8 billion light years in each exposure. The camera was built by the Dark Energy Survey Collaboration, an international partnership with Fermilab (USA) as the lead institution, and for which the majority of funding was provided by the USA Department of Energy. DECam is installed in Chile in the 4-m Victor Blanco Telescope of Cerro Tololo, part of the AURA Observatory in Chile, and whose financing comes from the National Science Foundation of the United States.

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Original Source

http://www.ctio.noao.edu/noao/content/Chilean-scientists-discover-crucial-event-right-death-star http://dx.doi.org/10.1038/s41550-018-0563-4

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