April 19th, 2025

A star appears to have collapsed straight into a black hole without supernova

Astronomers observed a massive star transforming into a black hole without a supernova, suggesting up to 30% of such stars may collapse this way, impacting our understanding of black hole formation.

Read original articleLink Icon
A star appears to have collapsed straight into a black hole without supernova

Astronomers have observed a massive star, 25 times the mass of the sun, that likely transformed into a black hole without undergoing a typical supernova explosion. This phenomenon, termed a "failed supernova," was studied using the Large Binocular Telescope and NASA's Hubble and Spitzer space telescopes. The star, located in the spiral galaxy NGC 6946, was initially visible and even increased in brightness significantly before disappearing from sight. Researchers concluded that the star must have collapsed into a black hole, as no remnants of a supernova were detected. This discovery suggests that up to 30% of massive stars may end their lives in this manner, which could explain the scarcity of observed supernovae from the most massive stars. The findings have implications for understanding the formation of very massive black holes, particularly those detected by the LIGO experiment, as it raises questions about the mass retention of stars post-explosion. The research was conducted by a team from The Ohio State University and supported by the National Science Foundation.

- A massive star was observed transforming into a black hole without a supernova.

- This process is referred to as a "failed supernova."

- Up to 30% of massive stars may collapse into black holes without exploding.

- The findings could explain the low number of observed supernovae from massive stars.

- The research has implications for understanding the origins of very massive black holes detected by LIGO.

Link Icon 11 comments
By @bell-cot - 21 days
Here's a short (12 page) and pretty easy article from The Astrophysical Journal (2003), about end of life for massive stars. And why some would "directly" collapse (no big & bright supernova) into black holes.

https://open.clemson.edu/cgi/viewcontent.cgi?article=1006&co...

By @andrewstuart - 21 days
It’s a weird and scary thought.

Imagine seeing that up fairly close - a massive star just shrivel into a black hole and wink out.

By @bell-cot - 21 days
It's been a while since I crawled Wikipedia's rabbit hole on this - but I recall there being regions of the stellar "mass vs. metallicity" graph in which direct collapse to a black hole is the expected outcome.

Is there an astrophysicist in the house?

By @amelius - 21 days
What is the timespan of such an event?
By @mikhailfranco - 20 days

  As many as 30 percent of such stars 
  may quietly collapse into black holes
  no supernova required.
where 'such' refers to 25 solar mass stars.

Is that a significant contribution to 'dark matter'?

By @therealfiona - 21 days
Here is an article about some JWST data of the star.

https://arxiv.org/abs/2309.16121

By @udev4096 - 21 days
(2017)
By @roman_soldier - 21 days
Could be an advanced civilisation sucking all the stars energy into the back of their spaceship.
By @keepamovin - 21 days
Or something just moved in front of it. It did not rage against the dying of the light, the definition of out with a whimper.