This bright burst first looked like a superkilonova similar to GW170817 but then changed shape quickly, showing blue light and hydrogen signals signs usually linked to supernovae instead.
Superkilonova: Scientists Detect Possible First-Ever Cosmic Explosion of Its Kind
The universe is full of incredible events that shape the stars and planets we see today. Recently, astronomers observed a rare cosmic phenomenon that may change how scientists understand the birth and collision of neutron stars. This event, called a superkilonova, could be a new kind of explosion combining two known types: the supernova and the superkilonova.
What Are Neutron Stars, Supernovae, and Kilonovae?
Neutron Stars: The Dense Star Remnants
Whenever big stars exhaust their fuel supply, neutron stars are produced. Supernova explosions are the result of their powerful explosions. Following its collapse, the remnant core forms an extremely dense mass that is only approximately 25 kilometers broad. These stars are extremely massive, with masses that are sometimes two or three times greater than that of our Sun.
Supernovae: Stellar Explosions That Create Heavy Elements
It is the spectacular demise of a big star that is referred to as a supernova. Carbon and iron are two of the key elements that are dispersed into space by it. This material contributes to the formation of new planets and life.
Kilonovae: Rare Explosions from Merging Neutron Stars
The collision of two neutron stars results in the explosion known as a kilonova. Gold and uranium are two of the heavier elements that are produced as a result of this explosion. In the year 2017, astronomers established the existence of a single kilonova event that was identified as GW170817. Additionally, it caused gravitational waves, which are thought to be ripples in space-time.
The Discovery of a Possible Superkilonova Event: AT2025ulz
A Double Blast Triggers Scientists’ Curiosity
On August 18, 2025, gravitational-wave detectors LIGO (in Louisiana and Washington) and Virgo (in Italy) picked up an unusual signal. It seemed to come from two merging objects—one smaller than typical neutron stars. Just hours later, telescopes around the world spotted a bright red flash in space named AT2025ulz.
This bright burst first looked like a superkilonova similar to GW170817 but then changed shape quickly, showing blue light and hydrogen signals signs usually linked to supernovae instead.
Merging Two Explosions into One Event?
A team led by Professor Mansi Kasliwal at Caltech believes this strange behavior might be a unique combination called a “superkilonova:” where a supernova quickly gives birth to neutron stars which then merge as a kilonova while still inside the exploding star’s debris.
This theory could explain why initial observations matched kilonova features but later showed characteristics typical for supernovae. Essentially, one powerful blast may hide or alter the signature of another explosive event happening shortly after.
The Exciting Possibilities for Future Research and Space Exploration
A Challenge to Current Models of Neutron Star Formation
This potential superkilonova presents a challenge to the conventional wisdom on the formation and collision of neutron stars. During the course of their collapse, some spinning big stars may divide into two smaller neutron stars, according to predictions made by scientists. This is a phenomenon that has never been observed in actual data but has been predicted by theory.
It will add another layer of complication to the way that astronomers interpret cosmic explosions that involve star remains if it turns out to be true.
The Importance of Detecting More Events Like AT2025ulz
The discovery highlights the importance of continuing monitoring with advanced observatories such as the Nancy Roman Space Telescope, which is scheduled to be launched by NASA, or the Vera Rubin Observatory, which is located at Caltech. In order to decipher more rare celestial phenomena in their entirety, these techniques are able to catch them at an earlier stage.
Additionally, to stay updated with the latest developments in STEM research, visit ENTECH Online. Basically, this is our digital magazine for science, technology, engineering, and mathematics. Further, at ENTECH Online, you’ll find a wealth of information.
Reference:
Kasliwal, M. M., Ahumada, T., Stein, R., Karambelkar, V., Hall, X. J., Singh, A., Fremling, C., Metzger, B. D., Bulla, M., Swain, V., Antier, S., Pillas, M., Busmann, M., Freeburn, J., Karpov, S., Bochenek, A., O’Connor, B., Perley, D. A., Akl, D., & Anand, S. (2025). ZTF25abjmnps (AT2025ulz) and S250818k: A Candidate Superkilonova from a Subthreshold Subsolar Gravitational-wave Trigger. The Astrophysical Journal Letters, 995(2), L59. https://doi.org/10.3847/2041-8213/ae2000
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