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        197 CANDIDATES and 104 VALIDATED PLANETS in K2's FIRST FIVE FIELDS

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        Crossfield_2016_ApJS_226_7.pdf (PDF, 2Mb)
        Author
        Crossfield, Ian J M
        Ciardi, David R.
        Petigura, Erik A.
        Sinukoff, Evan
        Schlieder, Joshua E.
        Howard, Andrew W.
        Beichman, Charles A.
        Isaacson, Howard
        Dressing, Courtney D.
        Christiansen, Jessie L.
        Fulton, Benjamin J.
        Lépine, Sébastien
        Weiss, Lauren
        Hirsch, Lea
        Livingston, John
        Baranec, Christoph
        Law, Nicholas M.
        Riddle, Reed
        Ziegler, Carl
        Howell, Steve B.
        Horch, Elliott
        Everett, Mark
        Teske, Johanna
        Martinez, Arturo O.
        Obermeier, Christian
        Benneke, Björn
        Scott, Nic
        Deacon, Niall
        Aller, Kimberly M.
        Hansen, Brad M S
        Mancini, Luigi
        Ciceri, Simona
        Brahm, Rafael
        Jordán, Andrés
        Knutson, Heather A.
        Henning, Thomas
        Bonnefoy, Michaël
        Liu, Michael C.
        Crepp, Justin R.
        Lothringer, Joshua
        Hinz, Phil
        Bailey, Vanessa
        Skemer, Andrew
        Defrere, Denis
        Attention
        2299/19178
        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 (8 R⊕ and/or with P
        Publication date
        2016-09-02
        Published in
        Astrophysical Journal, Supplement Series
        Published version
        https://doi.org/10.3847/0067-0049/226/1/7
        Other links
        http://hdl.handle.net/2299/19178
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