NASA’s James Webb Space Telescope Discovers Fourth Planet in Kepler-51 System
A recent study published in The Astronomical Journal has revealed the discovery of a fourth planet in the Kepler-51 system, an already remarkable planetary system known for hosting three ultra-low-density “super-puff” planets. This discovery was made by a research team led by Dr Jessica Libby-Roberts, a postdoctoral fellow at Penn State’s Centre for Exoplanets and Habitable Worlds, and Dr Kento Masuda, Associate Professor of Earth and Space Science at Osaka University. The finding suggests that the gravitational influence of the newly identified planet, named Kepler-51e, explains unexpected variations in the transit timings of the system’s known planets.
Unexpected Findings During Observations
As per a report by Phys.org, the researchers initially aimed to study Kepler-51d using NASA’s James Webb Space Telescope (JWST) but observed its transit occurring two hours earlier than predicted. This significant deviation prompted further analysis of data from NASA’s Kepler and TESS telescopes, Hubble Space Telescope and ground-based observatories such as the Apache Point Observatory (APO) and Palomar Observatory, as per reports. According to the team, only a four-planet model could account for the observed transit timing variations.
Insights Into the Kepler-51 System
Kepler-51e is believed to have a mass comparable to the existing planets in the system, following a relatively circular orbit of approximately 264 days. However, its classification as a “super-puff” remains uncertain due to the lack of transit data needed to calculate its radius and density. The inner three planets, known for their extremely low densities, continue to intrigue scientists. The team noted that accounting for the fourth planet alters previously estimated masses of the inner planets, slightly increasing their values while maintaining their status as super-puffs.
Future Implications of the Study
Dr Libby-Roberts, in a statement, indicated the potential for further exploration, stating that Kepler-51e’s orbit, located just inside the system’s habitable zone, suggests the possibility of additional planets or complex gravitational interactions. Continued observations may uncover planets farther from the star, contributing to the search for potentially habitable worlds. Researchers are also analysing data from JWST to study the atmospheric composition of Kepler-51d, which may shed light on the formation mechanisms of such unusual planets.
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The gas giant TOI-2109b is more than five times as massive as Jupiter, and resides in a perilous orbit 870 light-years from our planet. As an “ultrahot Jupiter,” it completes a lap around its parent star in a mere 16 hours, the briefest orbit of any such planet known. It is baking its atmosphere to broiling temperatures, and inching closer to oblivion in an orbit that is slowly pulling it in toward its parent sun. Using archived space telescope data from TESS and Cheops, astronomers have observed the testimony of this inevitable spiral, and contemplated three (wildly divergent) possible fates of the doomed planet.
Fates for TOI-2109b
According to the new research, conducted with data from NASA’s TESS and ESA’s Cheops missions shows that TOI-2109b’s orbit is decaying — a process it will continue for thousands of Earth’s years to come by 10 seconds over three Earth years. This proves that it is in a process of slow in fall. If the decay becomes worse, the planet may start falling directly into its host star and create a luminous flare, just like ZTF SLRN-2020. Alternatively, the star’s tidal forces could permanently warp the planet and rip it asunder.
A Potential Planetary Rebirth
There is a third, less-tragic possibility which could happen through a process of photoevaporation, in which strong radiation from the hosting star removes TOI-2109b’s gaseous envelope to reveal its rocky core. If the planet shrinks quickly enough, it might survive the process, avoiding its destruction by spiraling within its eternal Roche limit, and settling as a super-Earth or Neptune-sized blow-up hard relic. Then TOI-2109b would be an odd, rare opportunity to witness up close how this process unfolds.
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TOI-2109b, ultrahot Jupiter, exoplanet death spiral, TESS, Cheops, super-Earth, planetary evolution, space science, astronomy, NASA, ESA
The Hubble Space Telescope has taken its initial shots of comet 3I/ATLAS, a comet visiting us from beyond our solar system that recently fell apart — but not before it struck a pose for the cameras. It’s only the third such object ever known, after 1I/ʻOumuamua in 2017 and 2I/Borisov in 2019. The subject of numerous scientific tweets and some frantic searches by astronomers anxious to figure out just what it is — and where it came from — before it is gone into the pitch black of deep space forever, 3I/ATLAS was first sighted by the ATLAS survey telescope on July 1, 2025.
Ancient Interstellar Comet 3I/ATLAS Offers Clues to Planetary Systems Beyond Our Own
According to As per Space.com, recent studies indicate that 3I/ATLAS could be some 7 billion years old, well beyond the 4.6 billion years of our solar system. That’s an indication that the comet arose in the more ancient parts of the Milky Way, which would give researchers a rare glimpse of what the early days of other planetary systems were like. Undergraduate researcher Astrafoxen first flagged the Hubble images on Bluesky, noting the comet’s “nice and puffy” coma, despite interference from cosmic rays.
A newly available preprint paper has already revealed that 3I/ATLAS contains abundant water ice and a dust makeup resembling D-type asteroids—organic-rich bodies typically found in the outer solar system. Unlike ultrared trans-Neptunian objects, D-types are believed to have high carbon and silicate content, potentially shedding light on the comet’s deep-space origins and volatile chemistry.
The comet 3I/ATLAS was discovered just as the Vera C. Rubin Observatory was gearing up to carry out its initial observations of the heavens, dovetailing with the LSST’s expected discovery of many more interstellar objects in the coming decade.
Until then, 3I/ATLAS holds the astronomical spotlight. Its brief solar system passage offers a precious opportunity for researchers to analyse the material makeup of alien planetary systems. The Hubble images, now available for download, are expected to aid future papers as scientists continue to unravel the story of this ancient cosmic traveller.
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