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The Kepler-454 System: A Small, Not-rocky Inner Planet, a Jovian World, and a Distant Companion

Research output: Contribution to journalArticle

  • Sara Gettel
  • David Charbonneau
  • Courtney D. Dressing
  • Lars A. Buchhave
  • Xavier Dumusque
  • Andrew Vanderburg
  • Aldo S. Bonomo
  • Luca Malavolta
  • Francesco Pepe
  • Andrew Collier Cameron
  • David W. Latham
  • Stéphane Udry
  • Geoffrey W. Marcy
  • Howard Isaacson
  • Andrew W. Howard
  • Guy R. Davies
  • Victor Silva Aguirre
  • Hans Kjeldsen
  • Timothy R. Bedding
  • Laura Affer
  • Rosario Cosentino
  • Pedro Figueira
  • Aldo F. M. Fiorenzano
  • Avet Harutyunyan
  • John Asher Johnson
  • Mercedes Lopez-Morales
  • Christophe Lovis
  • Michel Mayor
  • Giusi Micela
  • Emilio Molinari
  • Fatemeh Motalebi
  • David F. Phillips
  • Giampaolo Piotto
  • Didier Queloz
  • Dimitar Sasselov
  • Damien Ségransan
  • Alessandro Sozzetti
  • Chris Watson
  • Sarbani Basu
  • Tiago L. Campante
  • Jørgen Christensen-Dalsgaard
  • Steven D. Kawaler
  • Travis S. Metcalfe
  • Rasmus Handberg
  • Mikkel N. Lund
  • Mia S. Lundkvist
  • Daniel Huber
  • William J. Chaplin

Related Edinburgh Organisations

Original languageEnglish
Pages (from-to)95
JournalAstrophysical Journal
Volume816
Issue number2
DOIs
StatePublished - 1 Jan 2016

Abstract

Kepler-454 (KOI-273) is a relatively bright (V = 11.69 mag), Sun-like star that hosts a transiting planet candidate in a 10.6 day orbit. From spectroscopy, we estimate the stellar temperature to be 5687 ± 50 K, its metallicity to be [m/H] = 0.32 ± 0.08, and the projected rotational velocity to be v sin i <2.4 km s-1. We combine these values with a study of the asteroseismic frequencies from short cadence Kepler data to estimate the stellar mass to be {1.028}-0.03+0.04{M}⊙ , the radius to be 1.066 ± 0.012 R⊙, and the age to be {5.25}-1.39+1.41 Gyr. We estimate the radius of the 10.6 day planet as 2.37 ± 0.13 R⊕. Using 63 radial velocity observations obtained with the HARPS-N spectrograph on the Telescopio Nazionale Galileo and 36 observations made with the HIRES spectrograph at the Keck Observatory, we measure the mass of this planet to be 6.8 ± 1.4 M⊕. We also detect two additional non-transiting companions, a planet with a minimum mass of 4.46 ± 0.12 MJ in a nearly circular 524 day orbit and a massive companion with a period >10 years and mass >12.1 MJ. The 12 exoplanets with radii

    Research areas

  • planetary systems, planets and satellites: composition, stars: individual: KOI-273 & KIC 3102384, asteroseismology, techniques: radial velocities

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