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Title: Kepler-22b: A 2.4 Earth-radius Planet in the Habitable Zone of a Sun-like Star
Authors: William J. Borucki, David G. Koch, Natalie Batalha, Stephen T. Bryson, Douglas A. Caldwell, Jřrgen Christensen-Dalsgaard, William D. Cochran, Edna DeVore, Thomas N. Gautier III, John C. Geary, Ronald Gilliland, Alan Gould, Steve B. Howell, Jon M. Jenkins, David W. Latham, Jack J. Lissauer, Geoffrey W. Marcy, Jason Rowe, Dimitar Sasselov, Alan Boss, David Charbonneau, David Ciardi, Guillermo Torres, Francois Fressin, Lisa Kaltenegger, Laurance Doyle, Andrea K. Dupree, Eric B. Ford, Jonathan Fortney, Matthew J. Holman, Jason A. Steffen, Fergal Mullally, Martin Still, Jill Tarter, Sarah Ballard, Lars A. Buchhave, Josh Carter, Jessie L. Christiansen, Brice-Olivier Demory, Jean-Michel Désert, Courtney Dressing, Michael Endl, Daniel Fabrycky, Debra Fischer, Michael R. Haas, Christopher Henze, et al. (37 additional authors not shown)

A search of the time-series photometry from NASA's Kepler spacecraft reveals a transiting planet candidate orbiting the 11th magnitude G5 dwarf KIC 10593626 with a period of 290 days. The characteristics of the host star are well constrained by high-resolution spectroscopy combined with an asteroseismic analysis of the Kepler photometry, leading to an estimated mass and radius of 0.970 ±0.060 Solar masses and 0.979 ±0.020 Solar radii. The depth of 492 ±10ppm for the three observed transits yields a radius of 2.38 ±0.13 Earth radii for the planet. The system passes a battery of tests for false positives, including reconnaissance spectroscopy, high-resolution imaging, and centroid motion. A full BLENDER analysis provides further validation of the planet interpretation by showing that contamination of the target by an eclipsing system would rarely mimic the observed shape of the transits. The final validation of the planet is provided by 16 radial velocities obtained with HIRES on Keck 1 over a one year span. Although the velocities do not lead to a reliable orbit and mass determination, they are able to constrain the mass to a 3{\sigma} upper limit of 124 Earth masses, safely in the regime of planetary masses, thus earning the designation Kepler-22b. The radiative equilibrium temperature is 262K for a planet in Kepler-22b's orbit. Although there is no evidence that Kepler-22b is a rocky planet, it is the first confirmed planet with a measured radius to orbit in the Habitable Zone of any star other than the Sun.

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Brian Cox on the discovery of new planet Kepler 22-b

TV Scientist Professor Brian Cox told Radio 5 live's Richard Bacon about the significance of discovering the new Earth-like planet.
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Earth-like planet, Kepler 22-b, is confirmed

Astronomers have confirmed the existence of an Earth-like world orbiting a star like our Sun in its "habitable zone".
The planet, Kepler 22-b, lies about 600 light-years away and is about 2.4 times the size of Earth, and has a temperature of about 22C.

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NASA's Kepler confirms its first habitable planet

In another step toward finding Earth-like planets that may hold life, NASA said Monday the Kepler space telescope has confirmed its first-ever planet in a habitable zone outside our solar system.
French astronomers earlier this year confirmed the first rocky exoplanet to meet key requirements for sustaining life. But Kepler-22b, initially glimpsed in 2009, is the first the US space agency has been able to confirm.

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Kepler 22-b: Earth-like planet confirmed

Astronomers have confirmed the existence of an Earth-like planet in the "habitable zone" around a star not unlike our own.
The planet, Kepler 22-b, lies about 600 light-years away and is about 2.4 times the size of Earth, and has a temperature of about 22C.
It is the closest confirmed planet yet to one like ours - an "Earth 2.0".

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NASA's Kepler Confirms Its First Planet In Habitable Zone

NASA's Kepler mission has confirmed its first planet in the "habitable zone," the region around a star where liquid water could exist on a planet's surface. Kepler also has discovered more than 1,000 new planet candidates, nearly doubling its previously known count. Ten of these candidates are near-Earth-size and orbit in the habitable zone of their host star. Candidates require follow-up observations to verify they are actual planets.
The newly confirmed planet, Kepler-22b, is the smallest yet found to orbit in the middle of the habitable zone of a star similar to our sun. The planet is about 2.4 times the radius of Earth. Scientists don't yet know if Kepler-22b has a predominantly rocky, gaseous or liquid composition, but its discovery is a step closer to finding Earth-like planets.

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