University of Hertfordshire

From the same journal


Research output: Contribution to journalArticlepeer-review


  • Ian J M Crossfield
  • David R. Ciardi
  • Erik A. Petigura
  • Evan Sinukoff
  • Joshua E. Schlieder
  • Andrew W. Howard
  • Charles A. Beichman
  • Howard Isaacson
  • Courtney D. Dressing
  • Jessie L. Christiansen
  • Benjamin J. Fulton
  • Sébastien Lépine
  • Lauren Weiss
  • Lea Hirsch
  • John Livingston
  • Christoph Baranec
  • Nicholas M. Law
  • Reed Riddle
  • Carl Ziegler
  • Steve B. Howell
  • And 24 others
  • Elliott Horch
  • Mark Everett
  • Johanna Teske
  • Arturo O. Martinez
  • Christian Obermeier
  • Björn Benneke
  • Nic Scott
  • Niall Deacon
  • Kimberly M. Aller
  • Brad M S Hansen
  • Luigi Mancini
  • Simona Ciceri
  • Rafael Brahm
  • Andrés Jordán
  • Heather A. Knutson
  • Thomas Henning
  • Michaël Bonnefoy
  • Michael C. Liu
  • Justin R. Crepp
  • Joshua Lothringer
  • Phil Hinz
  • Vanessa Bailey
  • Andrew Skemer
  • Denis Defrere
View graph of relations
Original languageEnglish
Article number7
Number of pages20
JournalAstrophysical Journal, Supplement Series
Publication statusPublished - 2 Sep 2016


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


© 2016. The American Astronomical Society. All rights reserved.

ID: 10715945