Lemon-Shaped Pulsar Planet Reveals Diamond Rain Mystery

Image Credit to Wikipedia

One of the strangest planets that have ever been discovered has been identified by astronomers. This particular planet has a mass similar to that of Jupiter and orbits a pulsar in a closeder orbit, such that the strong gravity exerted by the planet has led to it having a lemon shape. The new exotically discovered planet has been called PSR J2322-2650b. One of the things that researchers have noticed first about this new planet is that it has a strange new composition that has never been encountered before.

Image Credit to Wikipedia

1. An Orbit Measured in Hours

PSR J2322-2650b “orbits its pulsar parent at only 1 million miles,” which is less than 1 percent of the distance between our earth and the sun. Such proximity allows for the short orbital period of only 7.8 hours. PSR J2322-2650 is described as a fast-rotating neutron star with the sun’s mass compressed into a city-block-sized ball, which emits “gamma radiation,” as well as “energetic particles.” It is no surprise that the powerful radiation and gravity of PSR J2322-2650 resulted in the tidally locked PSR J2322-2650b exoplanet that is now “tidally locked,” meaning that one side of the exoplanet is in perpetual daylight, with record-breaking hot temperatures, while the other side is in perpetual darkness.

Image Credit to Wikipedia

2. Gravity’s Sculpting Power

 When General Relativity is coupled with gravity’s effect on very massive objects, in particular, it may lead to an extension of the aforementioned shape almost reaching its limit on the secondary body in close binary systems due to stronger tidal acceleration on its boundary regions.  A JWST results study on the phase curve analysis suggests that PSR J2322-2650b almost fills its Roche lobe with radii estimated at 0.99-1.18 radii of Jupiter and density at 1.8 g/cm³ with density ratio 1.8 g/cm³ and 1.8 g/cm³ for Jupiter ratio units.

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3. An Atmosphere Dominated by Carbon

By spectroscopy, molecular carbon in the form of C₂ and C₃ was found, along with characteristics of C-H bonds. There was very little oxygen, nitrogen, or hydrogen. From the night-side temperatures of 1,200°C to the hotter temperatures of 3,700°C on the dayside, there would have been elemental bonding of carbon with the above elements. Again, their absence makes way for the presence of elemental carbon on Venus. The ratio of C/O > 100 and that of C/N > 10,000. Both ratios are higher than in the atmospheres of stars or planets.

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4. Diamond Rain Hypothesis

In the deep environment of the atmospheres, “soot-like” clouds of carbon could have formed solid carbon crystals because of the high pressure. “The pure carbon crystals would have floated to the top and gotten mixed in with the helium, and that’s what we see,” said co-author Roger Romani. “But then something has to happen to keep the oxygen and nitrogen out. And that’s where the mystery comes in.”

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5. Pulsar Illumination Advantage

The pulse emission spectrum emitted by the pulsar is dominated by gamma rays, which are invisible to the infrared camera system of the JWST. In this case, “What’s special about this system is we’re able to observe the planet when it’s illuminated by its star, but not the star itself,” explained team member Maya Beleznay, who has modeled the geometric geometry of the planet.

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6. Winds Against the Spin

The brightness variations imply a phase difference associated with a thermal phase of about 12 degrees, implying a dominant westward motion opposed to the Planetary Rotation. This supports models attempting to describe dynamical atmospheres when the rotational period is less than 10 hours, implying that during such times, the equatorial jets will be narrower while those elsewhere would be dominated by westward flows. The circulation mode for PSR J2322-2650b is peculiar among hot Jupiters orbiting Main Sequence Stars.

Image Credit to depositphotos.com

7. Formation Mysteries

The so-called ‘black widow’ pulsars with scenarios of companion stars being stripped by pulsars cannot explain the composition. It is not possible to have highly pure carbon through known nuclear processes; other possible progenitors are not able to satisfy high C/O and C/N ratios simultaneously. It is proposed that PSR J2322-2650b could originate through stripping of a certain stellar core but with some ambiguities with regards to oxygen and nitrogen stripping.

Image Credit to Wikipedia

8. Engineering the Observation

The NIRSpec instruments on the JWST had the capability to identify both the low-resolution (PRISM) and high-resolution (G235H) spectral lines, thus allowing it to detect the velocity with a precision of 190 km/s, confirming the significance level of 21σ for the existence of C₂ molecules. Its orbit is predicted to be tilted at an inclination of 30° with masses estimated at 1.4-2.4 Jupiter masses. So much is known about its orbit and atmosphere due to the adequate energy output of the pulsar, meaning it does not saturate observations in the infrared region.

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9. Significations in Pulsar Physics

The low magnetic field strength and spindown luminosity express that there has been considerable accretion in the past that could change the mass as well as the moment of inertia. The fixing of the mass estimates available in this system can assist in fixing a limit on the Tolman-Oppenheimer-Volkoff limit, which symbolizes the largest neutron star mass and its corresponding relation. The discovery of the exoplanet named PSR J2322-2650b in the exoplanet family not only adds up in the rising numbers of known exoplanets in the current era of research in astrophysics.

But it also compels astrophysiologists to reinvestigate the limits of exoplanet formation and their interactions with a pulsar. The diamond rain in the exoplanet named PSR J2322-2650b that opposes the spin due to the wind in the exoplanet, which takes the form of a lemon because of the constant pull of gravity in the universe.

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