published in the journal Astronomy & Astrophysics. The newly discovered planets orbit a star called GJ 357, a red dwarf about a third the mass and size of the Sun and 40% cooler than our star. The system is located 31 light-years away in the constellation Hydra. The discovery began when NASA’s TESS (Transiting Exoplanet Survey Satellite) satellite detected in February the presence of a transiting exoplanet, that is, a planet outside our solar system that briefly obscures the light of its star as it passes in front of her in each orbit. An international group of scientists, led by researchers from the Instituto de Astrofísica de Canarias, used data obtained from various ground-based observatories to confirm the planet’s presence, and during the process

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discovered two additional worlds. “In a way, these Martinique Email List planets were hidden in measurements made in numerous observatories for many years”, explains Rafael Luque, doctoral student with a “la Caixa” scholarship and first author of the article. And he adds: “It was necessary for TESS to us will point to an interesting star to be able to discover them “. Of the three discovered planets, the most distant, called GJ 357 d, is especially interesting to researchers. The planet orbits the star every 55.7 days at a distance of about 20 percent of the Earth’s distance from the Sun, and weighs at least 6.1 times the mass of our planet. Although its size and composition are unknown, a rocky world with this mass would range between one and two times the size of Earth. ”

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is situated within the outer edge of its star’s habitable zone, where it receives almost the same amount of stellar energy as Mars from the Sun,” explains co-author Diana Kossakowski of the Max Planck Institute for Astronomy in Heidelberg. Without an atmosphere, the average temperature on its surface would be -53 ° C, which would make the planet more glacial than habitable. A complementary article, led by scientists from the Carl Sagan Institute of Cornell University and including researchers from the IAC, analyzes in detail the conditions of habitability of the planet. According to Lisa Kaltenegger, first author of the paper, “If GJ 357 d has a dense atmosphere, rich in carbon dioxide, it could trap enough heat to warm the planet and allow liquid water on its

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