New Study Casts Doubt on the Existence of Rogue Planets ‍Spotted by Webb

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Pairs of Jupiter-sized objects, dubbed “JuMBOs,” observed by the James Webb⁢ Space Telescope may be even ⁤rarer than initially believed,⁢ according ⁤to a ⁣new study that questions whether these enigmatic entities truly exist.

JuMBOs,short for “Jupiter-mass binary objects,” are planet-like objects,each with a mass between 0.7 and ⁢30⁢ times that of jupiter. the JWST spotted them in the Orion Nebula Cluster in 2023. Unlike planets in our solar system, JuMBOs do not orbit stars; instead, they orbit each other at‍ vast distances of 25 to ⁣400 astronomical units.

The origin of these rogue planets has baffled scientists, who⁤ have ‍proposed various formation scenarios.One idea suggests that⁢ JuMBOs formed around a star, similar ⁣to the planets ⁢in⁢ our ⁣solar system, but were later ejected by another star. Another hypothesis posits ‍that JuMBOs are the eroded cores of embryonic stars, meaning⁤ they formed like stars.

However, some researchers remain⁣ skeptical about the existence of JuMBOs. Kevin Luhman, a professor ⁤of astronomy ⁢and astrophysics at⁣ Penn State, reanalyzed the JWST observations in 2024 and suggested⁢ that the purported pairs ⁢are actually distant background objects captured in the telescope’s ⁢images.

Richard Parker, a senior lecturer in astrophysics at the⁤ University‍ of ⁤Sheffield in the U.K.⁤ and lead author of the new ⁣study, said discussions about Luhman’s work prompted⁢ the new research. Simon Goodwin, a‍ professor of theoretical astrophysics at the University ‍of Sheffield and ‍the study’s second author, ⁢suggested using⁤ simulations to⁢ assess how easily JuMBOs are destroyed.No‍ prior research had examined ⁢the longevity⁣ of these planetary pairs in interstellar space, where growing stars could disrupt them with ‍their gravitational forces.

To determine ‍how well JuMBOs withstand the turbulence of their birth surroundings, Parker, Goodwin, and Jessica Diamond,‍ created a computer⁤ model of a nebula containing 1,500 ‍stars and JuMBOs, mimicking the Orion Nebula Cloud’s original composition, Parker explained.

The researchers created five‍ copies of this ⁤model,⁣ varying parameters such ⁢as the ⁢distance ⁢between the planetary duo members and the nebula’s overall density. The ⁣team then conducted 10 rounds of N-body simulations for ‍each ‍model copy.

Parker explained that these‍ simulations calculate the gravitational force on each object from all other⁢ objects, revealing how different components of‍ the model nebula interact over time.

The simulations revealed that JuMBOs are highly ephemeral. In a dense nebula, nearly 90% of the planet pairs were destroyed by neighboring stars within ‍a million years. Even in the most favorable conditions,‍ with fewer stars and tighter orbits, only half ‍of the planet pairs survived. The analyses also showed that widely separated planet pairs were more prone to disruption.

Parker noted that he and ⁣his colleagues had previously found that‍ star-planet systems are fragile in⁣ star-filled environments. He added that as planet-planet binaries are less massive, they have ⁢lower energy and are even more susceptible⁢ to destruction.

The study, published in the Monthly Notices of the Royal Astronomical ⁢Society: Letters, indicates that the observed JuMBOs are extremely rare. Parker said this supports Luhman’s hypothesis that they⁢ may not⁢ exist, because to ⁤account for the JWST-detected JuMBO numbers, the planet⁢ pairs would have‍ had to ‍be⁣ produced in much larger numbers than currently believed. According to Parker, this result likely supports the interpretation of JuMBOs as background noise.

What’s next

Parker ⁣suggests that the next step ⁤is for researchers to reanalyze the original JWST data.