The James Webb Space Telescope (JWST) has once again amazed astronomers by revealing one of the most bizarre discoveries to date, offering a glimpse into the strange and distant corners of our universe.
In a new study published in The Astrophysical Journal Letters, scientists have explored the peculiar planet PSR J2322-2650b, which is caught in a strange and destructive relationship with its pulsar star.
The planet’s unusual shape and unexpected atmosphere have left researchers baffled, as they continue to piece together the mystery behind its existence.
PSR J2322-2650b, about the size of Jupiter, orbits a pulsar a rapidly spinning remnant of a massive star that has collapsed after a supernova explosion. This pulsar spins at an astonishing 700 times per second, making it a millisecond pulsar.
Pulsars emit powerful beams of radiation, which can only be detected when they are aligned with Earth. These beams are primarily gamma rays, which are incredibly intense.
However, because JWST operates in the infrared, it is unaffected by the pulsar’s overwhelming radiation, allowing astronomers to observe PSR J2322-2650b with clarity never before achieved.
According to Michael Zhang, principal investigator from the University of Chicago, the pulsar is “completely bizarre it has the mass of the sun, but is the size of a city.” He continued, “This is a new type of planet atmosphere that no one has ever seen before.”
PSR J2322-2650b is a lemon-shaped planet with an atmosphere made primarily of helium and carbon. The carbon-rich atmosphere likely causes diamond rain to fall on the planet’s surface.
Peter Gao, an astronomer at the Carnegie Earth and Planets Laboratory, expressed his surprise, saying, “It was an absolute shock. When we first analyzed the data, our collective reaction was, ‘What is this? It’s so different from what we expected.’”
The planet orbits its pulsar from a distance of just one million miles about 30 times closer than Mercury orbits the Sun. Because of this, PSR J2322-2650b completes an orbit in just eight hours.
Being so close to the pulsar has caused PSR J2322-2650b to develop a strange shape. This type of planet-pulsar pairing is referred to as a “black widow” system, named after the spider that devours its mate. Ultimately, PSR J2322-2650b is expected to be consumed by its pulsar.
The gravitational forces of the pulsar have tidally locked the planet, meaning that one side is always facing the pulsar. The sun-facing side is heated to an intense 3,700°F, while the dark side, which always faces space, remains much colder at 1,200°F.
At such extreme temperatures, astronomers would typically expect the carbon in the planet’s atmosphere to combine with other elements like oxygen or nitrogen. However, PSR J2322-2650b remains rich in pure molecular carbon, making it unlike any other planet studied so far.
Zhang remarked, “Did this planet form like a regular one? No, its composition is entirely different.” He added, “Did it form by stripping the outer layers of a star, like other black widow systems? Probably not, because nuclear physics does not produce pure carbon.”
The researchers are still investigating how the planet’s unique atmosphere was formed. One theory is that the carbon rain on the planet may play a key role.
Roger Romani, an astronomer from Stanford University, explained, “As the companion pulsar cools, the mixture of carbon and oxygen inside the planet begins to crystallize.
Pure carbon crystals float to the top and mix into the helium atmosphere, which is what we are observing.” He added, “But something must be preventing oxygen and nitrogen from mixing in, and that’s where the mystery lies.”
Romani concluded, “It’s exciting not to have all the answers yet. I’m eager to continue exploring the strange nature of this planet’s atmosphere. It’s a fascinating puzzle waiting to be solved.”
