Could the heat of distant planets reveal the universe's invisible mass?
In short: Visible matter makes up only 18% of everything in our universe. The rest is a mystery, yet we know it exists because its gravity holds galaxies together. Scientists are now looking for clues not in light, but in the unexpected warmth of massive exoplanets.
Dark matter remains one of physics' greatest enigmas because it does not emit light or interact with ordinary matter in any detectable way except through gravity. We infer its existence by observing galactic rotation: stars at the edges of galaxies like the Milky Way move far too fast to be held by the gravitational pull of visible mass alone. To keep these stars bound, there must be a significant amount of invisible mass providing extra gravity.
Traditional detection methods—including liquid Xenon baths, silicon chip sensors, and the Large Hadron Collider—have yet to produce a definitive signal. However, physicists Rebecca Leane and Juri Smirnov proposed a new mechanism in the journal Physical Review Letters. They suggest that certain types of dark matter could be captured by very massive exoplanets located near the center of our galaxy. Once trapped in high concentrations, these particles can collide and annihilate one another, releasing energy as heat.
This process would cause specific planets to reach temperatures significantly higher than expected. For instance, a planet with this dark matter source might reach 1,000 Kelvin, whereas a similar planet without it would be predicted at only 200 Kelvin. Because the effect scales with size, small bodies like Earth or Venus are unlikely candidates. Instead, researchers point to "super Jupiters"—planets up to 10 times larger than Jupiter—as the ideal subjects for this heat-based detection.
The search is poised to enter a new phase with the James Webb Space Telescope (JWST). Launched in 2021, this infrared telescope is specifically designed to detect heat. By observing these distant super Jupiters, astronomers hope to find the thermal signatures of dark matter annihilation, potentially solving one of the cosmos' most perplexing mysteries.
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- Summary by Intellect · source: How to "CATCH" Dark Matter
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