Astronomers captured the first evidence of a “planet harboring a wish for death.” The alien world is very close to that star, and the star cooks it with a star explosion until it dies.
The planet known as hip 67522 B is HIP 67522, a faint Jupiter-sized planet bound in a tight seven-day orbit around the host star.
However, these orbits disrupt the star’s magnetic field, causing giant eruptions to blow back onto the planet, causing it to shrink. Scientists reported in a study published in Nature on July 2nd, which was the first time they observed that planets affect host stars.
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“The planet appears to be causing particularly energetic flares,” Ekaterina Ilin, an astrophysicist at the Dutch Institute of Radio Astronomy, said in a statement. “The waves it sends along the star’s magnetic field line will begin to flare at certain moments. But the energy of the flare is much higher than the energy of the wave. I think the waves are creating an explosion waiting for it to happen.”
A star is a giant ball of burning plasma that creates a powerful magnetic field for charged particles or ions to swirl around the surface. Because the magnetic field lines cannot intersect each other, these fields have knots before suddenly snapping and firing a burst of radiation called solar flares.
Because many planets, including Earth, have magnetic fields, astronomers have wondered whether planets close to orbit around stars can disrupt stellar magnetic fields that are powerful enough to cause an explosion.
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To investigate this question, astronomers conducted extensive sweep of the stars using NASA’s passing exoplanetary survey satellite (TESS). This finds deformation by detecting the characteristic dimming of the star’s light as the planet passes forward. After flagging hip 67522 as worthy of interest, astronomers used the European Space Agency (ESA) to characterize and investigate exporanet satellites (Cheops).
“We immediately requested an observation of time in Cheops, which could target individual stars in demand,” Ilin said. “With the chops, we saw more flares, bringing the total count to 15. As seen from Earth, when a planet passes in front of a star, almost everything comes in our direction.”
The important evidence was that these flares occurred when the planet passed in front of the stars. This suggests that the planet is in orbit, collecting energy, and using it to “whip” the star’s magnetic field lines like a rope. When this shock wave passes through the field to the surface of the star, a powerful flare erupts.
These flares are slowly stripped off each layer of the planet’s diffused atmosphere. Researchers predict that HIP 67522 B is currently the same size as Jupiter, but will be able to reduce to the size of Neptune in the next 100 million years.
To further explore this first-time phenomenon, researchers plan to take more measurements with Tess, Chops and other exoplanet telescopes, including the ESA’s upcoming Plato Space Telescope, due to be released in 2026.
“It’s a whole new phenomenon, so there’s a million questions, so the details are not yet clear,” Ilin said. “There are two things I think are most important to do now. The first is to follow up at different wavelengths (Cheops covers that appear to be near-infrared wavelengths) to see what energy is being emitted in these flares.
“The second is to find and study other similar starry sky systems. By moving from a single case to a group of 10-100 systems, theoretical astronomers have something to do their job,” she added.
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