A Habitable-zone Earth-sized Planet Rescued from False Positive Status
Article
Article Title | A Habitable-zone Earth-sized Planet Rescued from False Positive Status |
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ERA Journal ID | 45091 |
Article Category | Article |
Authors | Vanderburg, Andrew (Author), Rowden, Pamela (Author), Bryson, Steve (Author), Coughlin, Jeffrey (Author), Batalha, Natalie (Author), Collins, Karen A. (Author), Latham, David W. (Author), Mullally, Susan E. (Author), Colon, Knicole D. (Author), Henze, Chris (Author), Huang, Chelsea X. (Author) and Quinn, Samuel N. (Author) |
Journal Title | The Astrophysical Journal Letters |
Journal Citation | 893 (1), pp. 1-8 |
Article Number | L27 |
Number of Pages | 8 |
Year | 2020 |
Publisher | IOP Publishing |
Place of Publication | United Kingdom |
ISSN | 2041-8205 |
2041-8213 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/2041-8213/ab84e5 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/2041-8213/ab84e5 |
Abstract | 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. |
Keywords | Exoplanet astronomy (486); Habitable planets (695); Astrophysics - Earth and Planetary Astrophysics; Astrophysics - Instrumentation and Methods for Astrophysics; Astrophysics - Solar and Stellar Astrophysics |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510109. Stellar astronomy and planetary systems |
Public Notes | For access to this article, please click on the URL link provided. |
Institution of Origin | University of Southern Queensland |
Byline Affiliations | University of Texas at Austin, United States |
Open University, United Kingdom | |
NASA Ames Research Center, United States | |
National Aeronautics and Space Administration (NASA), United States | |
University of California, United States | |
Center for Astrophysics Harvard and Smithsonian, United States | |
Space Telescope Science Institute, United States | |
NASA Goddard Space Flight Center, United States |
https://research.usq.edu.au/item/q7230/a-habitable-zone-earth-sized-planet-rescued-from-false-positive-status
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