Astronomers have secured the most compelling evidence yet that planets orbiting distant stars possess magnetic fields, mirroring a characteristic shared by Earth and five other worlds in our own solar system.
The breakthrough stems from observations of wind patterns across seven massive gas giants known as "hot Jupiters", conducted using telescopes located in Chile and Hawaii.
Published today in the journal Nature Astronomy, the research demonstrates that at least some exoplanets share this fundamental planetary trait found in six of our solar system's eight planets.
Magnetic fields arise from electrically conductive material moving within a planet's molten metallic core, combined with the planet's rotation.
The study revealed a counterintuitive pattern that the hottest planets exhibited the weakest atmospheric winds, defying conventional expectations about how atmospheres function.
Julia Seidel, an astronomer at the Observatoire de la Côte d'Azur's Lagrange Laboratory in Nice, France, who led the research, said: "What you would expect is that the planets with hotter temperatures would have stronger winds.
"The more energy you put into the system, the more violent the winds become. But we see the opposite."
"That means all that energy that the star puts into the planet's atmosphere has to be dissipated in a different way."
Astronomers have secured the most compelling evidence yet that planets orbiting distant stars possess magnetic fields
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She added: "And the only possibility to brake the atmosphere that much that fast is via the magnetic field and its interaction with the moving charged particles of the atmosphere."
These scorching worlds orbit remarkably close to their host stars, closer than Mercury orbits our Sun, with one hemisphere perpetually facing the stellar inferno while the other remains in permanent darkness.
Powerful atmospheric currents sweep from the blazing dayside towards the frigid nightside, reaching velocities of up to 15,500 miles per hour, far exceeding wind speeds observed on Jupiter.
The seven planets studied ranged from roughly Jupiter's mass to more than triple that size.
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Mars serves as a cautionary example, as it lost its magnetic field billions of years ago when its interior cooled
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Dr Seidel noted: "We do not look at a singular exoplanet, but we look at a population of them and see a trend emerge."
She explained how examining multiple worlds allowed researchers to identify the magnetic signature.
While none of the gas giants examined could support life, magnetic fields may prove crucial to the habitability prospects of rocky planets.
Bibiana Prinoth, an astronomer and study co-author at the European Southern Observatory in Germany, said: "Although it's a common misconception that magnetic fields directly determine whether a planet is habitable, they can play an important role in how a planet evolves over time."
The planet's atmosphere thinned dramatically, leaving behind an inhospitable landscape
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She added: "Life as we know it relies on having an atmosphere.
"An atmosphere helps maintain surface pressure, regulate temperature and, on Earth, allows liquid water to exist at the surface."
Mars serves as a cautionary example, as it lost its magnetic field billions of years ago when its interior cooled.
The planet's atmosphere thinned dramatically, leaving behind an inhospitable landscape.
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