Article (Scientific journals)
197 Candidates and 104 Validated Planets in K2' First Five Fields
Crossfield, I. J. M.; Ciardi, D. R.; Petigura, E. A. et al.
2016In Astrophysical Journal Supplement Series, 226, p. 7
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Keywords :
catalogs; planets and satellites: fundamental parameters; planets and satellites: general; techniques: high angular resolution; techniques: photometric; techniques: spectroscopic
Abstract :
[en] 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), 30 false positives, and 63 remaining candidates. Our validated systems span a range of properties, with median values of R P = 2.3 {R}\oplus , P = 8.6 days, {T}{eff} = 5300 K, and Kp = 12.7 mag. 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 ⊕, Kp = 9-13 mag). Of particular interest are 76 planets smaller than 2 R ⊕, 15 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 (\lt 2{R}\oplus ) and larger for candidates with radii \gt 8{R}\oplus and/or with P\lt 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.
Disciplines :
Space science, astronomy & astrophysics
Author, co-author :
Crossfield, I. J. M.
Ciardi, D. R.
Petigura, E. A.
Sinukoff, E.
Schlieder, J. E.
Howard, A. W.
Beichman, C. A.
Isaacson, H.
Dressing, C. D.
Christiansen, J. L.
Fulton, B. J.
Lépine, S.
Weiss, L.
Hirsch, L.
Livingston, J.
Baranec, C.
Law, N. M.
Riddle, R.
Ziegler, C.
Howell, S. B.
Horch, E.
Everett, M.
Teske, J.
Martinez, A. O.
Obermeier, C.
Benneke, B.
Scott, N.
Deacon, N.
Aller, K. M.
Hansen, B. M. S.
Mancini, L.
Ciceri, S.
Brahm, R.
Jordán, A.
Knutson, H. A.
Henning, T.
Bonnefoy, M.
Liu, M. C.
Crepp, J. R.
Lothringer, J.
Hinz, P.
Bailey, V.
Skemer, A.
Defrere, Denis ;  Université de Liège > Département d'astrophys., géophysique et océanographie (AGO) > Astroph. extragalactique et observations spatiales (AEOS)
More authors (34 more) Less
Language :
English
Title :
197 Candidates and 104 Validated Planets in K2' First Five Fields
Publication date :
2016
Journal title :
Astrophysical Journal Supplement Series
ISSN :
0067-0049
eISSN :
1538-4365
Publisher :
University of Chicago Press, United States - Illinois
Volume :
226
Pages :
7
Peer reviewed :
Peer Reviewed verified by ORBi
Available on ORBi :
since 04 November 2016

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