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Northwestern University

Groundbreaking Discovery: James Webb Space Telescope Reveals Red Giant Supernova Progenitor

Strategic Insights

— 2 min read

Researchers from Northwestern University led by Charlie Kilpatrick have captured the most detailed glimpse of a doomed star before it exploded, using NASA's James Webb Space Telescope (JWST). This achievement marks the JWST's first detection of a supernova progenitor, providing new insights into the lives and deaths of massive stars. The study reveals that the explosion came from a massive red supergiant star cloaked in an unexpected shroud of dust, solving a decades-old mystery of why these stars rarely explode.

Key Takeaways:

  • The study, published in The Astrophysical Journal Letters, reveals the most detailed glimpse of a doomed star before it exploded, using JWST.
  • The supernova progenitor is identified as a massive red supergiant star, cloaked in a thick shroud of dust, which is the reddest and dustiest ever observed.
  • The discovery challenges theoretical models that predict red supergiants should make up the majority of core-collapse supernovae, suggesting that previous explosions might have been more luminous due to dust obscuration.
  • The study highlights the importance of JWST's infrared observations, which have provided the quality of data needed to detect and characterize the reddish environment of the exploding star.
  • The research team, led by Northwestern's Charlie Kilpatrick, used archival images from the Hubble Space Telescope and the All-Sky Automated Survey of Supernovae to gather evidence for the discovery.
  • The supernova progenitor, dubbed SN2025pht, is found to be extremely bright and incredibly red, with a dusty veil that obscured much of its light, making it appear more than 100 times dimmer in visible light than it would without the dust.
  • The study suggests that massive stars might be dustier than previously thought, which could explain why they are less detectable before explosion.
  • Theobservations also reveal the dust composition, rich in carbon and less rich in oxygen, which is surprising for a red supergiant of this mass.

Statistics:

  • The star shined about 100,000 times brighter than our sun.
  • The dust veil that surrounded the star obscured much of its light, making it appear more than 100 times dimmer in visible light than it would without the dust.
  • The star is located in the galaxy NGC 1637, 40 million light-years away from Earth.
  • The study marks the first time astronomers have used JWST to directly identify a supernova progenitor star.
  • The research was supported by the National Science Foundation (award number AST-2432037).

Sources:

  • "The Type II SN 2025pht in NGC 1637: A red supergiant with carbon-rich circumstellar dust as the first JWST detection of a supernova progenitor star" published in The Astrophysical Journal Letters on October 8, 2025.
  • Northwestern University press release, October 26, 2025.
  • NewsRx LLC, October 26, 2025.

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