DISCOVERY AND VALIDATION OF Kepler-452b: A 1.6 R phi SUPER EARTH EXOPLANET IN THE HABITABLE ZONE OF A G2 STAR

作者：Jenkins Jon M; Twicken Joseph D; Batalha Natalie M; Caldwell Douglas A; Cochran William D; Endl Michael; Latham David W; Esquerdo Gilbert A; Seader Shawn; Bieryla Allyson; Petigura Erik; Ciardi David R; Marcy Geoffrey W; Isaacson Howard; Huber Daniel; Rowe Jason F; Torres Guillermo; Bryson Stephen T; Buchhave Lars; Ramirez Ivan; Wolfgang Angie; Li Jie; Campbell Jennifer R; Tenenbaum Peter; Sanderfer Dwight; Henze Christopher E; Catanzarite Joseph H

来源：Astronomical Journal, 2015, 150(2): 56.

DOI：10.1088/0004-6256/150/2/56

• methods: statistical
• planets and satellites: detection
• stars: fundamental parameters
• stars: individual (Kepler-452b, KIC 8311864, KOI7016.01)

We report on the discovery and validation of Kepler-452b, a transiting planet identified by a search through the 4 years of data collected by NASA's Kepler Mission. This possibly rocky 1.63(-0.20)(+0.23) R-circle plus every 384.843 (+0.007)(-0.012) days, the longest orbital period for a small (R-P < 2 R-circle plus) transiting exoplanet to date. The likelihood that this planet has a rocky composition lies between 49% and 62%. The star has an effective temperature of 5757 +/- 85 K and a log g of 4.32 +/- 0.09. At a mean orbital separation of 1.046 (-0.015) (+0.019) AU, this small planet is well within the optimistic habitable zone of its star (recent Venus/early Mars), experiencing only 10% more flux than Earth receives from the Sun today, and slightly outside the conservative habitable zone (runaway greenhouse/maximum greenhouse). The star is slightly larger and older than the Sun, with a present radius of 1.11 (-0.09) (+0.15) R-circle dot and an estimated age of similar to 6 Gyr. Thus, Kepler-452b has likely always been in the habitable zone and should remain there for another similar to 3 Gyr.

• 出版日期2015-8