A high-resolution image captured by the Large Binocular Telescope (LBT) in Arizona reveals an extraordinary phenomenon: a superluminous supernova, designated SN 2025wny, appearing five times in the night sky due to gravitational lensing by two foreground galaxies. This event, occurring 10 billion light-years away, provides a new method for measuring cosmic distances and the rate of the Universe’s expansion.
Superluminous supernovae serve as vital “standard candles” for astronomers, enabling them to gauge distances to objects billions of light-years away. The gravitational lensing effect, which bends the light from the supernova, results in multiple images appearing at different locations and times. By analyzing the time delays between these images, researchers can derive measurements of the Hubble-Lemaître Constant, a key factor in understanding cosmic expansion.
Collaboration and Observations
The research team, which includes scientists from the Technical University of Munich (TUM), the Max Planck Institute for Astrophysics (MPG), and several other institutions, has made significant strides in this area. Their findings have been accepted for publication in Astronomy & Astrophysics. The rarity of gravitationally lensed supernovae makes this study particularly noteworthy, as only a few such measurements have been attempted previously.
To determine the masses of the lensing galaxies, the team utilized the LBT’s two 8.4-meter mirrors and an adaptive optics system. This approach revealed two foreground galaxies surrounded by five bluish images of the supernova, resembling a fireworks display. Associate Professor Sherry Suyu from TUM noted that the chance of finding a superluminous supernova perfectly aligned with a suitable gravitational lens is less than one in a million.
Insights into Cosmic Expansion
Junior researchers Allan Schweinfurth and Leon Ecker constructed the first model of the lens mass distribution based on the positions of all five images. They found that the mass distributions of the two galaxies were smooth and regular, indicating they had not collided despite their close proximity. This simplicity presents an exciting opportunity for high-accuracy measurements of the Universe’s expansion rate.
This study introduces a third method for measuring cosmic expansion, complementing the existing Cosmic Distance Ladder and Cosmic Microwave Background (CMB) measurements. Unlike the Cosmic Distance Ladder, which relies on multiple steps and can accumulate errors, this new technique provides a more direct approach with fewer systematic uncertainties. Stefan Taubenberger, a key member of the research team, emphasized that this method could help address the ongoing Hubble Tension.
As astronomers worldwide continue to observe SN Winny with various telescopes, the results are anticipated to yield fresh insights into cosmic expansion and contribute to resolving the discrepancies in current measurements.
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