Ground-based telescopes provided the first real-time look at the death throes of a red supergiant star. While these aren’t the brightest or most massive stars, they are the largest in terms of volume.
However, the star at the heart of this new research, located in the NGC 5731 galaxy about 120 million light-years away from Earth, was 10 times more massive than the sun before it exploded.
Before they go out in a blaze of glory, some stars experience violent eruptions or release glowing hot layers of gas. Until astronomers witnessed this event, they believed that red supergiants were relatively quiet before exploding into a supernova or collapsing into a dense neutron star.
Instead, scientists watched the star self-destruct in dramatic fashion before collapsing in a type II supernova. This star death is the rapid collapse and violent explosion of a massive star after it has burned through the hydrogen, helium and other elements in its core.
“This is a breakthrough in our understanding of what massive stars do moments before they die,” said lead study author Wynn Jacobson-Galán, a National Science Foundation Graduate Research Fellow at University of California, Berkeley, in a statement.
“Direct detection of pre-supernova activity in a red supergiant star has never been observed before in an ordinary type II supernova. For the first time, we watched a red supergiant star explode.”
The final moments of stellar death
Astronomers were first alerted to the star’s unusual activity 130 days before it went supernova. Bright radiation was detected in the summer of 2020 by the University of Hawaiʻi Institute for Astronomy Pan-STARRS telescope on Maui’s Haleakalā.
Then, in the fall of that year, the researchers witnessed a supernova in the same spot.
They observed it using the W.M. Keck Observatory’s Low Resolution Imaging Spectrometer on Maunakea, Hawai’i, and named the supernova 2020tlf. Their observations revealed that there was material around the star when it exploded — the bright gas that the star violently kicked away from itself over the summer.
“It’s like watching a ticking time bomb,” said senior study author Raffaella Margutti, an associate professor of astronomy and astrophysics at UC Berkeley, in a statement. “We’ve never confirmed such violent activity in a dying red supergiant star where we see it produce such a luminous emission, then collapse and combust, until now.”
Some of these massive stars likely experience consequential internal changes that cause the tumultuous release of gas before they die, the finding has shown.
The work was conducted while Jacobson-Galán and Margutti were still at Northwestern University. They had remote access to the Keck Observatory’s telescopes in Hawai’i, which was “instrumental in providing direct evidence of a massive star transitioning into a supernova explosion,” Margutti said.
“I am most excited by all of the new ‘unknowns’ that have been unlocked by this discovery,” Jacobson-Galán said. “Detecting more events like SN 2020tlf will dramatically impact how we define the final months of stellar evolution, uniting observers and theorists in the quest to solve the mystery on how massive stars spend the final moments of their lives.”
