197 candidates and 104 validated planets in K2's first five fields
Article
Article Title | 197 candidates and 104 validated planets in K2's first five fields |
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ERA Journal ID | 1058 |
Article Category | Article |
Authors | Crossfield, Ian J. (Author), Ciardi, David R. (Author), Petigura, Erik A. (Author), Sinukoff, Evan (Author), Schlieder, Joshua E. (Author), Howard, Andrew W. (Author), Beichman, Charles A. (Author), Isaacson, Howard (Author), Dressing, Courtney D. (Author), Christiansen, Jessie L. (Author), Fulton, Benjamin J. (Author), Lepine, Sebastien (Author), Weiss, Lauren (Author), Hirsch, Lea (Author), Livingston, John (Author), Baranec, Christoph (Author), Law, Nicholas M. (Author), Riddle, Reed (Author), Ziegler, Carl (Author), Howell, Steve B. (Author), Horch, Elliott (Author), Everett, Mark (Author), Teske, Johanna (Author), Martinez, Arturo O. (Author), Obermeier, Christian (Author), Benneke, Bjorn (Author), Scott, Nic (Author), Deacon, Niall (Author), Aller, Kimberly M. (Author), Hansen, Brad M. S. (Author), Mancini, Luigi (Author), Ciceri, Simona (Author), Brahm, Rafael (Author), Jordan, Andres (Author), Knutson, Heather A. (Author), Henning, Thomas (Author), Bonnefoy, Michael (Author), Liu, Michael C. (Author), Crepp, Justin R. (Author), Lothringer, Joshua (Author), Hinz, Phil (Author), Bailey, Vanessa (Author), Skemer, Andrew (Author) and Defrere, Denis (Author) |
Journal Title | Astrophysical Journal Supplement Series |
Journal Citation | 226 (1), pp. 1-20 |
Article Number | 7 |
Number of Pages | 20 |
Year | 2016 |
Publisher | IOP Publishing |
Place of Publication | United States |
ISSN | 0067-0049 |
1538-4365 | |
Digital Object Identifier (DOI) | https://doi.org/10.3847/0067-0049/226/1/7 |
Web Address (URL) | https://iopscience.iop.org/article/10.3847/0067-0049/226/1/7 |
Abstract | We present 197 planet candidates discovered using data from the first year of the NASA K2 mission (Campaigns 0-4), along with the results of an intensive program of photometric analyses, stellar spectroscopy, high-resolution imaging, and statistical validation. We distill these candidates into sets of 104 validated planets (57 in multi-planet systems), false positives, and 63 remaining candidates. Our validated systems span a range of properties, with median values of RP= 2.3 R⊕, P = 8.6 days, Teff = 5300 K, and Kp = 12.7mag. Stellar spectroscopy provides precise stellar and planetary parameters for most of these systems. We show that K2 has increased by 30% the number of small planets known to orbit moderately bright stars (1-4 R R⊕, Kp = 9-13 mag). Of particular interest are planets smaller than 2 R⊕, orbiting stars brighter than Kp = 11.5 mag, 5 receiving Earth-like irradiation levels, and several multi-planet systems - including 4 planets orbiting the M dwarf K2-72 near mean-motion resonances. By quantifying the likelihood that each candidate is a planet we demonstrate that our candidate sample has an overall false positive rate of 15%-30%, with rates substantially lower for small candidates (<2R⊕) and larger for candidates with radii >8 R⊕ and/or with P<3 days. Extrapolation of the current planetary yield suggests that K2 will discover between 500 and 1000 planets in its planned four-year mission, assuming sufficient follow-up resources are available. Efficient observing and analysis, together with an organized and coherent follow-up strategy, are essential for maximizing the efficacy of planet-validation efforts for K2, TESS, and future large-scale surveys. |
Keywords | catalogs; planets and satellites: fundamental parameters; planets and satellites: general; techniques: high angular resolution; techniques: photometric; techniques: spectroscopic |
Contains Sensitive Content | Does not contain sensitive content |
ANZSRC Field of Research 2020 | 510104. Galactic astronomy |
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 Arizona, United States |
California Institute of Technology (Caltech), United States | |
University of Hawaii, United States | |
University of California, United States | |
Georgia State University, United States | |
University of Tokyo, Japan | |
University of North Carolina, United States | |
National Aeronautics and Space Administration (NASA), United States | |
Southern Connecticut State University, United States | |
National Optical Astronomy Observatory, United States | |
Carnegie Institution of Washington, United States | |
Max Planck Society, Germany | |
University of Sydney | |
University of Hertfordshire, United Kingdom | |
Millennium Institute of Astrophysics, Chile | |
Pontifical Catholic University of Chile, Chile | |
Grenoble Alpes University, France | |
University of Notre Dame, United States |
https://research.usq.edu.au/item/q442q/197-candidates-and-104-validated-planets-in-k2-s-first-five-fields
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