JWST Identifies SN 2025pht Progenitor at 8.7 Micrometers, Solving Decades-Old Missing Red Supergiant Puzzle
Updated
Updated · spacedaily.com · May 26
JWST Identifies SN 2025pht Progenitor at 8.7 Micrometers, Solving Decades-Old Missing Red Supergiant Puzzle
1 articles · Updated · spacedaily.com · May 26
SN 2025pht’s progenitor was found in pre-explosion James Webb images of NGC 1637, about 40 million light-years away, marking Webb’s first identification of a supernova progenitor star.
Webb detected the red supergiant from 1.3 to 8.7 micrometers while Hubble largely missed it, because a thick dust shroud dimmed the star’s optical light by roughly a factor of 100.
The star was about 100,000 times brighter than the Sun, and the dust appears carbon-rich rather than the silicate-rich material models had expected for red supergiants.
That composition points to late-stage internal mixing that may have dredged carbon from the star’s interior shortly before explosion, offering new clues to how massive stars die.
The finding suggests many “missing” red supergiant progenitors were hidden by dust rather than absent, and that Webb’s mid-infrared surveys could finally reconcile observations with supernova theory.
The Webb telescope found one 'missing' star before it exploded. How many more cosmic ghosts has it uncovered since then?
Was this dusty, dying star a cosmic rarity, or are most massive stars hiding their explosive final moments from us?
If dying stars can hide behind self-made dust shrouds, what other cosmic events have we been completely missing?
JWST’s First Direct Detection of a Hidden Supernova Progenitor Solves the “Missing Red Supergiant” Mystery
Overview
The James Webb Space Telescope (JWST) made a breakthrough by directly identifying the progenitor of supernova SN 2025pht—a red supergiant star hidden in a thick cloud of carbon-rich dust. Thanks to JWST’s advanced mid-infrared imaging, astronomers could observe at wavelengths like 8.7 micrometers and detect the heat from this star, which was invisible to visible-light telescopes like Hubble. This discovery shows that many massive stars are hidden by dust before exploding, helping solve the mystery of missing red supergiant supernova progenitors and revealing new details about the final stages of stellar evolution.