June 19, 2024

New Clues to Understanding the Mysterious Origin of Supernovae

It is typically thought that type Ia supernovae are produced by the explosion of degenerate stars understood as white overshadows– stars that have burnt up their hydrogen and diminished into compact items– the process that activates the surges is not well understood.

Just recently, the discovery of white overshadows that are moving incredibly rapidly has actually offered added reliability to one proposed system for the origin of these supernovae, D6. To examine this, the researchers chose to replicate the long-term advancement of a supernova residue lasting thousands of years after the surge.

Scientists from the RIKEN Cluster for Pioneering Research have actually utilized computer system modeling to demonstrate how a hypothesized kind of supernova would progress on the scale of countless years, giving researchers a method to look for examples of supernovae of this model, understood as “D6.”.
Supernovae are essential for cosmology since one type, Ia, is used as a “standard candle” that permits range to be measured. In fact, they were utilized for the measurements that revealed, surprisingly to first observers, that deep spaces expansion is accelerating. It is usually thought that type Ia supernovae are produced by the explosion of degenerate stars understood as white overshadows– stars that have actually burnt up their hydrogen and shrunk into compact things– the procedure that sets off the explosions is not well comprehended.

Recently, the discovery of white overshadows that are moving extremely rapidly has provided included credibility to one proposed mechanism for the origin of these supernovae, D6. In this circumstance, one of 2 white dwarfs in a binary system undergoes what is known as a “double detonation,” where a surface layer of helium first blows up, then sparking a larger surge in the carbon-oxygen core of the star. This leads to the obliteration of the star, and the buddy, all of a sudden devoid of the gravitational tourist attraction of the taking off star, is flung out at massive speed.
To investigate this, the scientists chose to imitate the long-term development of a supernova remnant lasting thousands of years after the surge. Scientists were able to discover numerous functions in the progenitor system that were specific to this situation, offering a method to explore supernova physics, such as a “shadow” or dark patch surrounded by a brilliant ring.
According to Gilles Ferrand, the very first author of the study, “The D6 supernova explosion has a specific shape. We were not confident that it would show up in the remnant long after the preliminary occasion, but in fact we found that there is a specific signature that we can still see countless years after the surge.”.
Shigehiro Nagataki, the leader of the Astrophysical Big Bang Laboratory at RIKEN, says, “This is a really crucial finding, since it could have an effect on using Ia supernovae as cosmic yardsticks. They were as soon as believed to originate from a single phenomenon, however if they vary, then it may require a reevaluation of how we use them.”.
Ferrand continues, “Moving forward, we plan to discover how to more precisely compute the X-ray emission, taking into consideration the structure and state of the stunned plasma, in order to make direct contrasts with observations. We hope that our paper will offer new ideas to observers, of what to look for in supernova residues.”.
The research, performed in conjunction with a worldwide group including scientists from the University of Manitoba, was released in The Astrophysical Journal on May 6th, 2022.
Reference: “The Double Detonation of a Double-degenerate System, from Type Ia Supernova Explosion to its Supernova Remnant” by Gilles Ferrand, Ataru Tanikawa, Donald C. Warren, Shigehiro Nagataki, Samar Safi-Harb and Anne Decourchelle, 6 May 2022, The Astrophysical Journal.DOI: 10.3847/ 1538-4357/ ac5c58.