Updated

Updated · Gizmodo · Jul 21

Researchers Identify 1st Candidate Binary Supernova System Using 16 Years of Fermi Data

Updated

Updated · Gizmodo · Jul 21

Researchers Identify 1st Candidate Binary Supernova System Using 16 Years of Fermi Data

Q: How does a star survive its companion’s blast, only to explode itself tens of thousands of years later?

It can happen if both stars were massive and already close to the ends of their lives, so the first supernova did not destroy the second star outright. In the IC 443–G189.6+3.3 system, researchers think the two stars began as a binary pair, each roughly 20 to 40 times the Sun’s mass. The more evolved star exploded first, creating the older remnant, G189.6+3.3. That blast likely disrupted the binary and gave the companion a “kick,” sending it away rather than vaporizing it. A supernova is devastating, but at typical binary separations the companion can survive if it is not directly engulfed and if the explosion’s energy mostly expands outward into space. The surviving star would not need to be healthy for long by stellar standards. If it was already nearing core collapse, tens of thousands of years is a short delay. Massive stars live only millions of years, so a gap of about 20,000 to 100,000 years between explosions is plausible. The second star then exhausted its own fuel and exploded, producing IC 443, the younger remnant. That scenario fits the evidence. The two remnants are about 6,000 light-years away, separated by roughly 40 light-years, and both are interacting with the same giant gas cloud. Their estimated ages also line up: IC 443 is about 8,000 to 9,000 years old, while G189.6+3.3 is about 20,000 to 110,000 years old. Simulations show such separations and delays are realistic for interacting massive binaries.

3 articles · Updated · Gizmodo · Jul 21

A Nature Communications study says IC 443 and the newly confirmed G189.6+3.3 are likely the first observed remnants of a binary star system, rather than two unrelated supernova leftovers.
Sixteen years of NASA Fermi gamma-ray data, combined with X-ray and other observations, let researchers separate G189.6+3.3 from IC 443’s glare and show it emits gamma rays independently.
Spectral analysis found G189.6+3.3 accelerates protons and electrons and shares a gas cloud interaction with IC 443, placing both remnants in the same neighborhood about 6,000 light-years away.
A statistical test put the odds of a chance alignment at 1 in 1,000, leaving the team to label the pair a strong—but not yet certain—binary supernova candidate.
The finding could sharpen models of how massive binary stars die, including how long separates the two explosions and whether the system survives or is disrupted.

Sources

Gizmodo11h ago

Researchers Identify First Candidate Binary Supernova System, IC 443 and G189.6+3.3, Using NASA Fermi Data

Phys.org11h ago

Jellyfish nebula may be the scene of two stars going supernova

Scientific American10h ago

Astronomers Discover Rare Double Supernova System in Jellyfish Nebula Using Fermi Data

6 Sources

With the Rubin Observatory now scanning the sky, are we about to find many more of these ghost-like stellar pairs?

How does a star survive its companion’s blast, only to explode itself tens of thousands of years later?

Landmark Discovery: Dual Supernova Remnants in a Binary System Unveiled in Jellyfish Nebula Region

Overview

A major breakthrough in astrophysics was announced on June 17, 2026, revealing the first candidate binary supernova system. Researchers, led by Miltiadis Michailidis, used 16 years of data from NASA’s Fermi Gamma-ray Space Telescope to identify the Jellyfish Nebula (IC 443) and the hidden remnant G189.6+3.3 as two distinct supernova remnants from a pair of stars that both exploded. The main challenge was that G189.6+3.3 was concealed by the bright gamma-ray emissions of IC 443. This discovery opens new doors for understanding how massive stars in binary systems live and die.

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