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AN international team of scientists said yesterday they had discovered a trio of Earth-like planets that are the best bet so far for finding life outside our solar system.The three orbit an ultracool dwarf star a mere 39 light years away, and are likely comparable in size and temperature to Earth and Venus, they reported in a study, published in Nature.
“This is the first opportunity to find chemical traces of life outside our solar system,” said lead author Michael Gillon, an astrophysicist at the University of Liege in Belgium.
All three planets had the “winning combination” of being similar in size to Earth, “potentially habitable” and close enough so their atmospheres can be analyzed with current technology, he said.
The find opens up a whole new “hunting ground” for habitable planets, Gillon added.Gillon and colleagues calibrated a 60-centimeter telescope in Chile, known as TRAPPIST, to track several dozen dwarf stars neither big nor hot enough to be visible with optical telescopes.
They zeroed in on a particularly promising one — now known as TRAPPIST-1 — about one eighth the size of the Sun, and significantly cooler. Observing it for months, the astronomers noticed that its infrared signal faded slightly at regular intervals, evidence of objects in orbit. More analysis confirmed they were exoplanets — planets revolving around stars outside our solar system.
The innermost two circle their dwarf star every 1.5 and 2.4 days, though they are hit with only four and two times the amount of heat-generating radiation that Earth receives from the Sun.The more distant orbit of the third planet takes between four and 73 days, the study said.
“These planets are so close, and their star so small, we can study their atmosphere and composition,” said co-author Julien de Wit, of the Massachusetts Institute of Technology. “This is a jackpot for the field.”
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