Discovery and validation of Kepler-452b: A 1.6 R⊕; super earth exoplanet in the habitable zone of a G2 star

Jenkins, Jon M. and Twicken, Joseph D. and Batalha, Natalie M. and Caldwell, Douglas A. and Cochran, William D. and Endl, Michael and Latham, David W. and Esquerdo, Gilbert A. and Seader, Shawn and Bieryla, Allyson and Petigura, Erik and Ciardi, David R. and Marcy, Geoffrey W. and Isaacson, Howard and Huber, Daniel and Rowe, Jason F. and Torres, Guillermo and Bryson, Stephen T. and Buchhave, Lars and Ramirez, Ivan and Wolfgang, Angie and Li, Jie and Campbell, Jennifer R. and Tenenbaum, Peter and Sanderfer, Dwight and Henze, Christopher E. and Catanzarite, Joseph H. and Gilliland, Ronald L. and Borucki, William J. (2015) Discovery and validation of Kepler-452b: A 1.6 R⊕; super earth exoplanet in the habitable zone of a G2 star. The Astronomical Journal, 150 (2). pp. 56-74. ISSN 0004-6256

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Abstract

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 planet orbits its G2 host star every days, the longest orbital period for a small ( ) 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 of 4.32 ± 0.09. At a mean orbital separation of 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 and an estimated age of ∼6 Gyr. Thus, Kepler-452b has likely always been in the habitable zone and should remain there for another ∼3 Gyr.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: Access to published version in accordance with the copyright policy of the publisher.
Faculty / Department / School: No Faculty
Date Deposited: 12 Jun 2017 22:33
Last Modified: 30 Oct 2017 01:25
Uncontrolled Keywords: statistical methods; planets and satellites detection; stars: fundamental parameters; stars; Kepler-452b; KIC 8311864; KOI7016.01
Fields of Research : 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Socio-Economic Objective: E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: 10.1088/0004-6256/150/2/56
URI: http://eprints.usq.edu.au/id/eprint/32197

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