Webb Telescope spotted objects that are roughly the size of Jupiter—but they don’t orbit any parent star.
NASA, ESA, CSA / Science leads and image processing: M. McCaughrean, S. Pearson
A team of astronomers have detected over 500 planet-like objects in the inner Orion Nebula and the Trapezium Cluster that they believe could shake up the very definition of a planet.The 4-light-year-wide Trapezium Cluster sits at the heart of the Orion Nebula, or Messier 42, about 1,400 light-years from Earth. The cluster is filled with young stars, which make their surrounding gas and dust glow with infrared light.
In the preprint, the team describes 540 planetary mass candidates, with the smallest masses clocking in at about 0.6 times the mass of Jupiter., analysis revealed steam and methane in the JuMBOs’ atmospheres. The researchers also found that 9% of those objects are in wide binaries, equivalent to 100 times the distance between Earth and the Sun or more. That finding is perplexing, because objects of JuMBOs’ masses typically orbit a star.
Webb will continue to scrutinize these free-floating planet-sized non-planets, alongside other small stars and brown dwarfs. More imaging of the candidate objects is planned for spring 2024. The more the telescope sees, the better astronomers might be able to draw the imaginary lines that distinguish one type of object from another.
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