A Habitable-zone Earth-sized Planet Rescued from False Positive Status

Vanderburg, Andrew and Rowden, Pamela and Bryson, Steve and Coughlin, Jeffrey and Batalha, Natalie and Collins, Karen A. and Latham, David W. and Mullally, Susan E. and Colon, Knicole D. and Henze, Chris and Huang, Chelsea X. ORCID: https://orcid.org/0000-0003-0918-7484 and Quinn, Samuel N. (2020) A Habitable-zone Earth-sized Planet Rescued from False Positive Status. The Astrophysical Journal Letters, 893 (1):L27. pp. 1-8. ISSN 2041-8205

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We report the discovery of an Earth-sized planet in the habitable zone of a low-mass star called Kepler-1649. The planet, Kepler-1649 c, is 1.06+0.15 -0.10 times the size of Earth and transits its 0.1977 ± 0.0051 M⊙mid M-dwarf host star every 19.5 days. It receives 74% ± 3% the incident flux of Earth, giving it an equilibrium temperature of 234 ± 20 K and placing it firmly inside the circumstellar habitable zone. Kepler-1649 also hosts a previously known inner planet that orbits every 8.7 days and is roughly equivalent to Venus in size and incident flux. Kepler-1649 c was originally classified as a false positive (FP) by the Kepler pipeline, but was rescued as part of a systematic visual inspection of all automatically dispositioned Kepler FPs. This discovery highlights the value of human inspection of planet candidates even as automated techniques improve, and hints that terrestrial planets around mid to late M-dwarfs may be more common than those around more massive stars.

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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Additional Information: File reproduced in accordance with the copyright policy of the publisher/author.
Faculty/School / Institute/Centre: No Faculty
Faculty/School / Institute/Centre: No Faculty
Date Deposited: 31 Mar 2022 04:41
Last Modified: 13 Apr 2022 00:52
Uncontrolled Keywords: Exoplanet astronomy (486); Habitable planets (695); Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics; Astrophysics - Solar and Stellar Astrophysics
Fields of Research (2020): 51 PHYSICAL SCIENCES > 5101 Astronomical sciences > 510109 Stellar astronomy and planetary systems
Identification Number or DOI: https://doi.org/10.3847/2041-8213/ab84e5
URI: http://eprints.usq.edu.au/id/eprint/47375

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