Giant, Solitary Planets Can Create Complete planetary Systems Without Needing Stars

Written by Fabio Lucas Carvalho

Published on 04/08/2025 at 17:54

Updated on 04/08/2025 at 17:55

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Study From the University of St. Andrews Reveals That Floating Giant Planets Can Form Miniature Planetary Systems Even Without the Presence of a Star.

Researchers from the University of St. Andrews have revealed that floating giant planets can form miniature planetary systems even without the presence of a star.

The study was published on the arXiv preprint server and utilized data from the James Webb Space Telescope (JWST).

These objects have 5 to 10 times the mass of Jupiter and do not orbit stars. Instead, they wander freely through space, emitting radiation primarily in the infrared.

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What Are Floating Planets

These celestial bodies resemble giant planets, but differ in that they are not connected to stellar systems. Research indicates that they form in a manner similar to stars, from the collapse of giant gas clouds.

However, they do not accumulate enough mass to initiate nuclear fusion reactions. Another possibility is that they form orbiting a star and are later ejected into interstellar space.

Detailed Observations

The team from the School of Physics and Astronomy at St. Andrews, along with scientists from the US, Italy, Ireland, England, and Portugal, observed eight of these young objects to study their initial phase.

The measurements were conducted between August and October 2024, using two high-sensitivity infrared instruments from the JWST. Spectroscopic data was obtained with unprecedented coverage and sensitivity for this type of object.

Evidence of Planetary Formation

The analyses confirmed that the masses of these bodies are comparable to that of Jupiter. In six of them, excess emissions in the infrared were detected. This is an indication of the presence of hot dust disks, structures that function as nurseries for planet formation.

Additionally, researchers found emission of silicate grains in these disks. This signal points to dust growth and crystallization — initial processes in the formation of rocky planets.

This is the first time silicate emission has been identified in objects with planetary mass. Previously, it had only been observed in stars and brown dwarfs.

Sufficient Time to Create Worlds

Previous studies from St. Andrews indicate that the disks around these floating planets can last millions of years. This period is sufficient for the formation of complete planets, even in such small systems.

According to Dr. Aleks Scholz, the leader of the research, the results show that worlds with mass similar to that of giant planets can create systems similar to ours, but much smaller — up to 100 times more compact.

He emphasizes that it is still uncertain whether these systems actually exist, but the evidence indicates that the potential is present.

Implications for Astronomy

For the lead author, Dr. Belinda Damian, the study demonstrates that the building blocks of planets can emerge even in objects slightly larger than Jupiter and without being linked to stars.

Therefore, the formation of planetary systems is not exclusive to stars. Solitary worlds, dispersed in space, can also give rise to their own sets of planets.

Study available at arxiv.

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Giant, Solitary Planets Can Create Complete planetary Systems Without Needing Stars

Study From the University of St. Andrews Reveals That Floating Giant Planets Can Form Miniature Planetary Systems Even Without the Presence of a Star.

What Are Floating Planets

Detailed Observations

Evidence of Planetary Formation

Sufficient Time to Create Worlds

Implications for Astronomy

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Giant, Solitary Planets Can Create Complete planetary Systems Without Needing Stars

Study From the University of St. Andrews Reveals That Floating Giant Planets Can Form Miniature Planetary Systems Even Without the Presence of a Star.

What Are Floating Planets

Detailed Observations

Evidence of Planetary Formation

Sufficient Time to Create Worlds

Implications for Astronomy

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A giant brown band visible from space, approximately 8,850 kilometers long, connected Africa to America in the Atlantic Ocean, and satellites revealed that it is neither land nor pollution, but the largest accumulation of seaweed in the world, which broke records in 2025.

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