SN Ares: A Strongly Lensed Type IIb Supernova at $\mathbf{z=1.276}$ with a Predicted 70-Year Time Delay
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Conor Larison, Justin D. R. Pierel, Matthew Siebert, Tom Resseguier, Lukas J. Furtak, Masamune Oguri et al. · arXiv: 2610.33161v1 · Summary page
Why cover this story this week?
A supernova with a delayed return
The gravity of a foreground galaxy cluster has magnified a distant supernova called Ares. JWST spectroscopy reveals helium and hydrogen features that identify it as a Type IIb event: an explosion from a star that had lost much, but not all, of its hydrogen envelope. The authors describe it as the highest-redshift member of this class identified spectroscopically.
The cluster’s gravitational lens also sends light along paths of different lengths. A model predicts that Ares will appear again in other images of its host galaxy after a delay of roughly 70 years or longer. That is a forecast, not an observed recurrence; planned spectroscopy should improve the lens model. The discovery nevertheless shows how gravitational lenses can expose distant stellar explosions while turning their future appearances into tests of the intervening mass distribution.
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