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Astronomers using the LOFAR telescope located in the Netherlands have likely recorded a radio signal coming from an exoplanet. It is located just 50 light-years from Earth in the constellation Bootes, according to Science alert.
When the stellar wind, a stream of charged particles emanating from the host star, hits the planet’s magnetic field, it changes speed, which can be recorded as changes in radio emission. Earth’s magnetic field “screams” and “cries” when the solar wind hits it. The same is observed in other planets of the solar system.
To detect the same “whisper” from exoplanets, scientists must first get out of the noise from Earth and its surroundings. Several years ago the BOREALIS program was developed for this. Scientists tested it on Jupiter and then discovered what the gas giant would sound like if it were much further away.
Using the radio emission analysis method, scientists have already made several preliminary detections of planets. Including a discovery earlier this year, when they recorded radio wave activity with interactions between the star GJ 1151’s magnetic field and a potential planet the size of Earth. But all of this has yet to be confirmed by further radio observations.
Now scientists have recorded a signal that comes from a system containing hot Jupiter. A system called Tau Bootesa is 51 light years from Earth. The planet itself was found in 1996, orbiting its binary star in 3.3 days.
If the scientists’ observations can be confirmed with the help of other telescopes, this will be the first radiation in the radio range that humanity has managed to record.
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