All articles tagged with #type 1a supernova
A new, extensive catalog of 2,087 Type 1a supernovae suggests that dark energy, which drives the universe's expansion, may be weakening over time, challenging the standard cosmological model that predicts it should be constant. This finding, based on data spanning 7 billion years, could have significant implications for our understanding of the universe's fate, although further data is needed for confirmation.
Astronomers using ESO's VLT have found visual evidence that a Type 1a supernova, SNR 0509-67.5, exploded twice through a double-detonation process, confirmed by the discovery of two separate calcium shells, supporting models where white dwarfs can explode before reaching the Chandrasekhar mass limit.
An international team of astronomers has discovered a previously unknown source of cosmic dust in the universe: Type 1a supernovae interacting with gas from their surroundings. This finding, published in Nature Astronomy, suggests that thermonuclear supernovae may account for a significant amount of dust in elliptical galaxies. The researchers monitored a supernova, SN 2018evt, for over three years and observed the creation of dust in the circumstellar gas after it cooled following the supernova shock wave passing through it. This discovery sheds light on the contribution of thermonuclear supernovae to cosmic dust and may have implications for space exploration, particularly with the upcoming James Webb Space Telescope.
NASA's James Webb Space Telescope captured an image of a type 1a supernova, providing researchers with a potential solution to the "Hubble tension" problem, which is the discrepancy between measuring the expansion of the universe using the cosmic microwave background (CMB) and the Hubble constant. The image showcases the supernova as a streak of orange light, magnified by gravitational lensing, and located 16 billion light-years from Earth. By studying this extremely old supernova, scientists hope to understand the discrepancy and unravel one of the biggest mysteries of the universe.
A new study using data from ESA’s Gaia survey has revealed six additional runaway stars, two of which break the record for the fastest radial velocity of any runaway star ever seen. These stars were launched by Type 1a supernovas, which occur in binary star systems. The study also suggests that double detonation supernovae can produce runaway stars, which are faster than those caused by single detonation supernovae. The fastest star in the galaxy is J0927, with a radial velocity almost twice that of any other star in the galaxy.