University of Hertfordshire

From the same journal

From the same journal

By the same authors

The LCES HIRES/Keck Precision Radial Velocity Exoplanet Survey

Research output: Contribution to journalArticle


  • 1702.03571

    Accepted author manuscript, 4 MB, PDF-document

  • R. Paul Butler
  • Steven S. Vogt
  • Gregory Laughlin
  • Jennifer A. Burt
  • Eugenio J. Rivera
  • Mikko Tuomi
  • Johanna Teske
  • Pamela Arriagada
  • Matias Diaz
  • Brad Holden
  • Sandy Keiser
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Original languageEnglish
Number of pages19
JournalThe Astrophysical Journal
Journal publication date13 Apr 2017
StatePublished - 13 Apr 2017


We describe a 20-year survey carried out by the Lick-Carnegie Exoplanet Survey Team (LCES), using precision radial velocities from HIRES on the Keck-I telescope to find and characterize extrasolar planetary systems orbiting nearby F, G, K, and M dwarf stars. We provide here 60,949 precision radial velocities for 1,624 stars contained in that survey. We tabulate a list of 357 significant periodic signals that are of constant period and phase, and not coincident in period and/or phase with stellar activity indices. These signals are thus strongly suggestive of barycentric reflex motion of the star induced by one or more candidate exoplanets in Keplerian motion about the host star. Of these signals, 225 have already been published as planet claims, 60 are classified as significant unpublished planet candidates that await photometric follow-up to rule out activity-related causes, and 54 are also unpublished, but are classified as "significant" signals that require confirmation by additional data before rising to classification as planet candidates. Of particular interest is our detection of a candidate planet with a minimum mass of 3.9 Earth masses and an orbital period of 9.9 days orbiting Lalande 21185, the fourth-closest main sequence star to the Sun. For each of our exoplanetary candidate signals, we provide the period and semi-amplitude of the Keplerian orbital fit, and a likelihood ratio estimate of its statistical significance. We also tabulate 18 Keplerian-like signals that we classify as likely arising from stellar activity.


This document is the Accepted Manuscript version of the following article: R. Paul Butler, et al, The LCES HIRES/Keck Precision Radial Velocity Exoplanet Survey, The Astronomical Journal, Vol 153 (5), 19 pp., published 13 April 2017. The Version of Record is available online at doi: Paper data available at: © 2017. The American Astronomical Society. All rights reserved.

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