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In a solar system about 1,800 light-years from Earth, two planets smacked into one another in an impact that vaporized them both. And astronomers caught them in the act., lingering after an impact, could explain a surge of infrared light from a remote star, researchers report October 11 in. And the ensuing debris field could also explain a subsequent dimming of the star, the team says.
As he was analyzing the fading star, Kenworthy stumbled upon another clue — on social media. One of his posts on Twitter about ASASSN-21qj’s unusual behavior caught the eye of citizen scientist Arttu Sainio. “I tweeted out saying: ‘Oh, this is amazing, this star is fading!’” Kenworthy says. “Then he said: ‘Oh, by the way, did you realize the star had brightened up ?’”
Two exoplanets collided in a smashup that left behind a glob of hot, vaporized rock and a debris cloud. Astronomers first observed the afterglow of the collision in infrared light. Then, 900 days later, they saw the pulverized planets’ star dim as impact debris drifted in front of it, between the star and Earth.
The putative post-impact blob could one day coalesce into a planet. And as the remaining debris shears out into a disk orbiting the star, it too might eventually collect onto the new planet or form moons around it.
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