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Characterizing K2 Planet Discoveries: A Super-Earth Transiting the Bright K Dwarf HIP 116454

Research output: Contribution to journalArticle

  • Andrew Vanderburg
  • Benjamin T. Montet
  • John Asher Johnson
  • Lars A. Buchhave
  • Li Zeng
  • Francesco Pepe
  • Andrew Collier Cameron
  • David W. Latham
  • Emilio Molinari
  • Stéphane Udry
  • Christophe Lovis
  • Jaymie M. Matthews
  • Chris Cameron
  • Nicholas Law
  • Brendan P. Bowler
  • Ruth Angus
  • Christoph Baranec
  • Allyson Bieryla
  • Walter Boschin
  • David Charbonneau
  • Rosario Cosentino
  • Xavier Dumusque
  • Pedro Figueira
  • David B. Guenther
  • Avet Harutyunyan
  • Coel Hellier
  • Rainer Kuschnig
  • Mercedes Lopez-Morales
  • Michel Mayor
  • Giusi Micela
  • Anthony F. J. Moffat
  • Marco Pedani
  • David F. Phillips
  • Giampaolo Piotto
  • Don Pollacco
  • Didier Queloz
  • Reed Riddle
  • Jason F. Rowe
  • Slavek M. Rucinski
  • Dimitar Sasselov
  • Damien Ségransan
  • Alessandro Sozzetti
  • Andrew Szentgyorgyi
  • Chris Watson
  • Werner W. Weiss

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Original languageEnglish
Pages (from-to)59
JournalAstrophysical Journal
Issue number1
Publication statusPublished - 1 Feb 2015


We report the first planet discovery from the two-wheeled Kepler (K2) mission: HIP 116454 b. The host star HIP 116454 is a bright (V = 10.1, K = 8.0) K1 dwarf with high proper motion and a parallax-based distance of 55.2 ± 5.4 pc. Based on high-resolution optical spectroscopy, we find that the host star is metal-poor with [Fe/H] =–0.16 ± 0.08 and has a radius R sstarf = 0.716 ± 0.024 R ☉ and mass M sstarf = 0.775 ± 0.027 M ☉. The star was observed by the Kepler spacecraft during its Two-Wheeled Concept Engineering Test in 2014 February. During the 9 days of observations, K2 observed a single transit event. Using a new K2 photometric analysis technique, we are able to correct small telescope drifts and recover the observed transit at high confidence, corresponding to a planetary radius of Rp = 2.53 ± 0.18 R ⊕. Radial velocity observations with the HARPS-N spectrograph reveal a 11.82 ± 1.33 M ⊕ planet in a 9.1 day orbit, consistent with the transit depth, duration, and ephemeris. Follow-up photometric measurements from the MOST satellite confirm the transit observed in the K2 photometry and provide a refined ephemeris, making HIP 116454 b amenable for future follow-up observations of this latest addition to the growing population of transiting super-Earths around nearby, bright stars.

    Research areas

  • planets and satellites: detection, techniques: photometric

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