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“Cold Neptune” And Two Temperate Super-Earths Found Orbiting Nearby Stars

15 Jan 2020, 11:55 UTC
“Cold Neptune” And Two Temperate Super-Earths Found Orbiting Nearby Stars
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Artist’s concept of GJ229Ac, the nearest temperate super-Earth to us that is in a system in which the host star has a brown dwarf companion. Top Right Image: An artist’s concept of GJ180d, which is the nearest temperate super-Earth to us that is not tidally locked to its star, making it more likely to be able to host and sustain life. Illustrations are by Robin Dienel, courtesy of the Carnegie Institution for Science.

Washington, DC (Carnegie Institution for Science PR) — A “cold Neptune” and two potentially habitable worlds are part of a cache of five newly discovered exoplanets and eight exoplanet candidates found orbiting nearby red dwarf stars, which are reported in The Astrophysical Journal Supplement Series by a team led by Carnegie’s Fabo Feng and Paul Butler.

The two potentially habitable planets are orbiting GJ180 and GJ229A, which are among the nearest stars to our own Sun, making them prime targets for observations by next-generation space- and land-based telescopes. They are both super-Earths with at least 7.5 and 7.9 times our planet’s mass and orbital periods of 106 and 122 days respectively.

The Neptune-mass planet—found orbiting GJ433 at a distance at which surface water is likely ...

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