Posted on 12/20/2025 3:56:07 PM PST by Red Badger
An artist's illustration of what exoplanet PSR J2322-2650b might look like. Because of its extremely tight orbit, the planet’s entire year—the time it takes to go around the pulsar—is just 7.8 hours. (Credit: NASA, ESA, CSA, Ralf Crawford (STScI))
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Nothing about this planet makes sense. And that’s both confounding and exciting for astronomers.
In A Nutshell
* Astronomers discovered a Jupiter-sized planet with an atmosphere unlike anything seen before, dominated by carbon molecules in ratios that defy current planetary formation theories.
* The planet orbits a pulsar (a dead star’s ultra-dense core) every 7.8 hours and is blasted with gamma rays, heating its atmosphere to nearly 3,000 degrees Fahrenheit while stretching it into a lemon shape.
* The carbon-to-oxygen ratio exceeds 100 to 1, and carbon-to-nitrogen tops 10,000 to 1—numbers so extreme that no known planet orbiting a normal star comes close, leaving scientists without an explanation for how it formed.
* The planet’s unusual heating from gamma rays creates powerful westward winds and dramatic temperature differences between its day and night sides, making it a unique laboratory for studying atmospheres under extreme conditions.
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Astronomers have discovered what might be the strangest planet ever found: a lemon-shaped world where soot clouds drift through the air and diamonds may form deep underground. Its composition is so extreme that scientists are left searching for an explanation of how such an object could form.
The Jupiter-sized world dubbed “PSR J2322-2650b” circles a pulsar just 1 million miles away, closer than any planet in our solar system gets to the Sun. It completes one orbit in just 7.8 hours. The intense gravity from this dead star squeezes the planet into an oval shape like a lemon.
But the real mystery is what the planet is made of. Its atmosphere contains carbon in amounts that scientists can’t explain. No theory of how planets form can account for what they’re seeing.
Using the James Webb Space Telescope to observe the entire orbit, researchers explain that molecular carbon dominates the spectrum so completely that oxygen, nitrogen, and hydrogen (elements typically abundant in planetary atmospheres) appear strongly depleted or weren’t clearly detected.
“The planet orbits a star that’s completely bizarre — the mass of the Sun, but the size of a city,” explained lead author Michael Zhang, of the University of Chicago, in a statement. “This is a new type of planet atmosphere that nobody has ever seen before.”
This artist’s concept shows what the exoplanet called PSR J2322-2650b (left) may look like as it orbits a rapidly spinning neutron star called a pulsar (right). Gravitational forces from the much heavier pulsar are pulling the Jupiter-mass world into a bizarre lemon shape. (Credit: NASA, ESA, CSA, Ralf Crawford (STScI))
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“This was an absolute surprise,” added co-author Peter Gao of the Carnegie Earth and Planets Laboratory in Washington, D.C. “I remember after we got the data down, our collective reaction was ‘What the heck is this?'”
An Atmosphere Built From Carbon Chains
When light passes through the planet’s atmosphere, different molecules absorb specific colors. By analyzing which colors are missing, astronomers can identify what molecules are present. In this case, the spectrum revealed molecules rarely seen in planetary atmospheres: C3 (three carbon atoms bonded together) and C2 (two carbon atoms).
These carbon chains absorbed light at specific wavelengths (particular colors in the infrared, invisible to human eyes). C3 showed up as a sudden drop at 3.014 microns, in the infrared beyond human vision. C2 created a sawtooth pattern between 2.45 and 2.85 microns. Additional absorption features suggested the presence of carbon-hydrogen bonds, though the exact molecules remain uncertain.
To understand how unusual this is, consider what should happen in a hot atmosphere. Carbon and oxygen atoms strongly prefer to bond together, forming carbon monoxide. The only way to have more molecular carbon than carbon monoxide is if carbon outnumbers oxygen by huge amounts, in this case, by more than 2,000 to one. Similarly, carbon and nitrogen should bond together unless carbon outnumbers nitrogen by more than 10,000 to one.
“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,” the researchers wrote.
How Black Widows Form, And Why This One Breaks the Rules The planet orbits what astronomers call a pulsar, or the collapsed core left behind when a massive star explodes. Pulsars spin incredibly fast and shoot out beams of radiation like cosmic lighthouses.
This particular system is what’s called a “black widow,” named after the creepy, venomous spiders that eat their mates. In space, the pulsar slowly destroys its companion star through radiation and gravity, stealing away its outer layers bit by bit.
Scientists thought they understood how these systems form. This process should produce an object made mostly of helium if the stripping happens early enough, before the star begins converting helium into carbon in its core through nuclear fusion. The remnant should contain whatever elements existed in the star’s core at that moment, typically a mix of helium, carbon, nitrogen, and oxygen in moderate ratios.
This planet doesn’t fit that pattern at all.
“Did this thing form like a normal planet? No, because the composition is entirely different,” said Zhang. “Did it form by stripping the outside of a star, like normal black widow systems? Probably not, because nuclear physics doesn’t make pure carbon.”
Some rare stars show elevated carbon levels, with carbon-to-oxygen ratios reaching 12 to 81. While higher than typical stars, these values still fall far short of what this planet displays.
Other aging stars convert helium into carbon through a nuclear process, creating what astronomers call “carbon stars.” These reach carbon-to-oxygen ratios of only several. They produce carbon-rich dust in their outflows, offering another potential carbon source. However, the mechanism for concentrating that dust into a Jupiter-mass planet with such extreme ratios remains unclear.
In one illustrative model, the planet consists mostly of helium with roughly 1% carbon by mass in its interior. A planet made entirely of carbon would be much smaller and denser than observations indicate, about one-third Jupiter’s radius rather than roughly matching it. But if the planet is mostly helium inside, what process concentrated so much carbon in the atmosphere we can see?
0:20 VIDEO AT LINK...................
VIDEO: This animation shows an exotic exoplanet orbiting a distant pulsar, or rapidly rotating neutron star with radio pulses. The planet, which orbits about 1 million miles away from the pulsar, is stretched into a lemon shape by the pulsar’s strong gravitational tides. (Credit: NASA, ESA, CSA, Ralf Crawford (STScI))
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Gamma-Ray Heat and Westward Winds
The planet’s heating differs from anything seen on worlds orbiting normal stars. Gamma rays likely penetrate deep into the atmosphere instead of warming just the surface layers the way visible sunlight does on Earth.
In the models, these high-energy photons deposit their energy at a depth where the pressure reaches about 10 bars, roughly 10 times the air pressure at sea level on Earth. This deep heating drives the planet’s wind patterns differently than on normal hot Jupiters (giant planets orbiting close to their stars).
The researchers tracked how the planet’s light shifted to bluer or redder wavelengths as it moved toward or away from Earth in its orbit. From these measurements, they determined the planet orbits at a tilt of 31 degrees (imagine tilting a hula hoop from flat by about one-third of a right angle) and has a mass between 1.4 and 2.4 times Jupiter’s mass.
The temperature structure shows dramatic day-night contrasts. The nightside maintains a relatively uniform 900 Kelvin (about 1,160 degrees Fahrenheit) with a smooth spectrum, suggesting either consistent temperature throughout that side or a thick cloud deck blocking our view. The dayside reaches 2,300 Kelvin (about 3,680 degrees Fahrenheit) at its hottest points.
Surprisingly, the hottest spot doesn’t line up with the point facing the pulsar. Instead, the temperature peak appears shifted westward by about 12 degrees, indicating powerful winds blowing opposite to the planet’s rotation direction.
Computer models of rapidly rotating planets predict exactly this behavior. Most hot Jupiters orbiting normal stars have winds flowing eastward around their equators, like a jet stream. But when a planet spins faster than once every 10 hours or so, the pattern flips. Westward winds dominate away from the equator. PSR J2322-2650b offers strong evidence consistent with this predicted pattern.
Diamonds and Soot
Here’s where it gets even wilder. At the planet’s surface, carbon exists as simple molecules and floating soot particles. But deep inside, the pressure is so intense that carbon atoms might be getting squeezed into diamond crystals.
Roger Romani of Stanford University, who is also one of the world’s top experts on black widow systems, has a theory: “As the companion cools down, the mixture of carbon and oxygen in the interior starts to crystallize. Pure carbon crystals float to the top and get mixed into the helium, and that’s what we see.”
If he’s right, this planet could have a helium ocean with diamond icebergs floating in it.
“But then something has to happen to keep the oxygen and nitrogen away,” Romani added. “And that’s where there’s controversy.”
Blasted by Gamma Rays
The planet gets heated in a way nothing in our solar system experiences. Instead of visible sunlight warming just the surface, gamma rays from the pulsar penetrate deep into the atmosphere.
Computer models show this creates temperature extremes. The night side stays around 1,160°F, hot enough to melt lead. The day side reaches 3,680°F, nearly hot enough to vaporize iron.
Artist’s illustration of a gamma-ray burst resulting from a collapsing stars, ejecting particles and radiation in a narrow jet. (Credit: Soheb Mandhai)
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The heating pattern also creates powerful winds. On most planets that orbit close to their stars, winds blow eastward, circling the equator like Earth’s jet streams. But this planet spins so fast, one full rotation every 7.8 hours, that the pattern flips. Westward winds dominate instead.
The hottest spot on the planet sits about 12 degrees west of the point facing directly at the pulsar, proving those westward winds exist.
What Comes Next
This system gave astronomers a unique opportunity. Normally when you study a planet, the star it orbits is much brighter and drowns out the planet’s light. But this pulsar emits mostly gamma rays and high-energy particles that are invisible to Webb’s infrared cameras.
The discovery establishes PSR J2322-2650b as a laboratory for studying planetary atmospheres under extreme conditions never before observed. It combines ultrahigh carbon ratios with ultrafast rotation and external gamma-ray heating.
The planet’s existence raises questions about other ultralight black-widow companions. Do they share similar compositions, or is PSR J2322-2650b uniquely weird?
The researchers encourage observations of PSR J1719-1438, another pulsar companion with similar mass but much higher density of 21 grams per cubic centimeter (about twice the density of lead). That object might be an ultralow-mass carbon white dwarf (the dense core of a dead star) rather than a gas giant, offering a comparison case.
Better atmospheric models will require improved laboratory data for larger carbon molecules, including C4, C5, C3H, and C2H. These molecules likely exist in the atmosphere but can’t yet be identified without better measurements of their unique light-absorption fingerprints.
The formation mystery remains unsolved. The extreme carbon enrichment sits far outside any established scenario for producing planetary-mass objects around pulsars.
“It’s nice to not know everything,” said Romani. “I’m looking forward to learning more about the weirdness of this atmosphere. It’s great to have a puzzle to go after.”
Lemon Shaped Planet Ping!................
It’s the football that went into orbit in “The Absent-Minded Professor”!
lol
And all the world is football shaped,
it’s just for me to kick in space
I’ve got one, two, three, four, five senses working overtime
Trying to taste the difference between lemons and limes.
NASA has already created a custom astronaut through genetic advancements.
His training should be complete when he comes of age.
But does it have it’s own Lemon Song?
You mean to tell me….Science isn’t settled?
I used to fall asleep listening to that album when I was a teenager.................
B-b-b-but they had CONSENSUS!.................
Lemme’ guess... Inhabited by a race of Meringues?
In a nutshell... Someone needs to fix their telescope.
Sometimes the moon looks like a banana.
“An Atmosphere Built From Carbon Chains”.
Maybe not a good place to drive a Ferrari.
Not unline LI expressways, or Manhattan.
https://www.youtube.com/watch?v=AjFhZoxK_QM
Sometimes a banana is just a banana.................
Other times it looks like a golf ball.
One of the most enjoyable results from the James Webb Space Telescope is all of the discoveries that “shouldn’t be there.”
I was always amused at “scientists” determining the size and age of the universe. The Hubble Space Telescope could “see” to a certain distance in the Cosmos. The Webb Telescope can detect objects even farther. Some of these Webb discoveries do not fit with the established theory.
The essence of real science is constantly testing and confirming, or not, current theories.
What is beyond the limit of the Webb Telescope’s vision? I will probably not live to see those discoveries, but they will, no doubt, alter our theories once again.
Probably formed from what was blasted into space when the star exploded.
Sometimes Mars looks like a 🍅 tomato.
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