A super-earth-sized planet orbiting in or near the habitable zone around a sun-like star

Barclay, Thomas and Burke, Christopher J. and Howell, Steve B. and Rowe, Jason F. and Huber, Daniel and Isaacson, Howard and Jenkins, Jon M. and Kolbl, Rea and Marcy, Geoffrey W. and Quintana, Elisa V. and Still, Martin and Twicken, Joseph D. and Bryson, Stephen T. and Borucki, William J. and Caldwell, Douglas A. and Ciardi, David and Clarke, Bruce D. and Christiansen, Jessie L. and Coughlin, Jeffrey L. and Fischer, Debra A. and Li, Jie and Haas, Michael R. and Hunter, Roger and Lissauer, Jack J. and Mullally, Fergal and Sabale, Anima and Seader, Shawn E. and Smith, Jeffrey C. and Tenenbaum, Peter and Kamal Uddin, A. K. M. and Thompson, Susan E. (2013) A super-earth-sized planet orbiting in or near the habitable zone around a sun-like star. The Astrophysical Journal, 768 (2). pp. 101-108. ISSN 0004-637X

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We present the discovery of a super-Earth-sized planet in or near the habitable zone of a Sun-like star. The host is Kepler-69, a 13.7 mag G4V-type star. We detect two periodic sets of transit signals in the 3-year flux time series of Kepler-69, obtained with the Kepler spacecraft. Using the very high precision Kepler photometry, and follow-up observations, our confidence that these signals represent planetary transits is >99.3%. The inner planet, Kepler-69b, has a radius of R⊕ and orbits the host star every 13.7 days. The outer planet, Kepler-69c, is a super-Earth-sized object with a radius of R⊕ and an orbital period of 242.5 days. Assuming an Earth-like Bond albedo, Kepler-69c has an equilibrium temperature of 299 ± 19 K, which places the planet close to the habitable zone around the host star. This is the smallest planet found by Kepler to be orbiting in or near the habitable zone of a Sun-like star and represents an important step on the path to finding the first true Earth analog.

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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/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 05 Jun 2017 22:43
Last Modified: 27 Jun 2017 00:58
Uncontrolled Keywords: planetary systems; fundamental parameters; stars (Kepler-69, KIC 8692861, KOI-172); statistics; photometric techniques
Fields of Research (2008): 02 Physical Sciences > 0201 Astronomical and Space Sciences > 020110 Stellar Astronomy and Planetary Systems
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Socio-Economic Objectives (2008): E Expanding Knowledge > 97 Expanding Knowledge > 970102 Expanding Knowledge in the Physical Sciences
Identification Number or DOI: https://doi.org/10.1088/0004-637X/768/2/101
URI: http://eprints.usq.edu.au/id/eprint/32129

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