The universe has changed significantly in the 14 billion years since its creation. It was a dusty start, and all chemical elements were missing at that time. Stars form as the universe evolves, and astronomers classify them into three groups: population. The youngest, most metal-rich stars like the Sun are classified as Population I, while old, metal-poor stars are classified as Population II.
Astronomers also classify the oldest metal-free stars as Population III or pop. III. To date, no astronomer has discovered a Pop. III star due to their theoretical age being older than the Milky Way and other surrounding galaxies, requiring telescopes to explore extreme distances.
An international team of scientists proposed a new approach to searching for Pop. III stars by expanding the search to include supernova explosions, improving the odds of discovering these ancient stars.
The research team focused on a type of supernova explosion called a white dwarf reignited by injection of a substance, resulting in flare-ups like Type Ia supernova.
To test their hypothesis, astronomers used a stellar astrophysics experimental code module called mesa to conduct simulations. Through these simulations, they found that Pop. III stars could indeed produce type Ia supernovae, debunking previous doubts. They then estimated the frequency of these supernovae in observable regions of space.
Based on their calculations, scientists could expect to find up to two Pop. III Type Ia supernovae in a three-year mission covering 0.002% of the sky. They emphasized the need for telescopes like JWST, which can observe extreme distances of 24 billion light-years.
While their discovery relies on assumptions about unseen physics, the researchers believe that most distant supernovae come from ancient stars, potentially allowing us to witness events from billions of years ago.
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Source: sciworthy.com
