Study Findings: A Carbon-rich Atmosphere on a Windy Pulsar Planet

Posted on by onespaceman2000
Image (Credit): Artist’s rendering of of an exoplanet orbiting a rapidly spinning neutron star called a pulsar. (NASA, ESA, CSA, Ralf Crawford (STScI))

Abstract of pre-publication study findings:

A handful of enigmatic Jupiter-mass objects have been discovered orbiting pulsars. One such object, PSR\,J2322-2650b, uniquely resembles a hot Jupiter exoplanet due to its minimum density of 1.8 g/cm^3 and its ~1900 K equilibrium temperature. We use JWST to observe PSR J2322-2650b’s emission spectrum across an entire orbit. In stark contrast to every known exoplanet orbiting a main-sequence star, we find an atmosphere rich in molecular carbon (C3, C2) with strong westward winds. Our observations open up new exoplanetary chemical (ultra-high C/O and C/N ratios of >100 and >10,000, respectively) and dynamical regimes (ultra-fast rotation with external irradiation) to observational study. The extreme carbon enrichment poses a severe challenge to the current understanding of “black widow” companions, which were expected to consist of a wider range of elements due to their origins as stripped stellar cores.

Citation: Michael Zhang et al. A carbon-rich atmosphere on a windy pulsar planet. ApJL (2025).

https://doi.org/10.48550/arXiv.2509.04558

Study-related stories:

University of Chicago – “NASA’s Webb Telescope Finds Bizarre Atmosphere on a Lemon-shaped Exoplanet”

Scientific American – “This Planet Is the Shape of a Lemon. That May Be the Least Weird Thing about It”

Space Daily – “Webb Maps Carbon Rich Atmosphere on Distorted Pulsar Planet”