An American team has just published an article in Nature highlighting the presence of a third star orbiting the high-mass X-ray binary (HMXB) V404 Cygni.
The discovery of this third distant companion suggests that the stellar black hole at the heart of the X-ray binary may have formed without a supernova explosion, which would be unprecedented.
This discovery, as the authors explain in the article, was made by chance while the authors were exploring images from the PanSTARRS survey using Aladin Lite, the software developed by the CDS at the Strasbourg Astronomical Observatory.
You too can explore these images using Aladin Lite:
Article : The black hole low-mass X-ray binary V404 Cygni is part of a wide triple