PSR J2322−2650

PSR J2322−2650 is a millisecond pulsar located approximately 750 light-years from Earth in the constellation Sculptor. It is notable for its low luminosity and for hosting a confirmed exoplanet, PSR J2322−2650 b, a Jupiter-mass object discovered through pulsar timing observations in 2017. The system is one of the few known examples of a pulsar with a surviving planetary companion, offering insights into planetary formation and survival in the aftermath of a supernova.
In December 2025, the James Webb Space Telescope provided the first detailed infrared observations of the exoplanet, revealing an exotic, carbon and helium dominated atmosphere that challenges conventional models of planetary formation.

Planetary system

PSR J2322−2650 b

PSR J2322−2650 b is a tidally locked exoplanet discovered in 2017. In 2025, the James Webb Space Telescope found that the planet's atmosphere is dominated by helium and carbon, likely featuring clouds of carbon soot that condense to create diamonds, but an unexplained absence of nitrogen and oxygen.