University of Hertfordshire

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Discovery and spectroscopy of the young Jovian planet 51 Eri b with the Gemini Planet Imager

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  • B. Macintosh
  • J. R. Graham
  • T. Barman
  • R. J. De Rosa
  • Q. Konopacky
  • M. S. Marley
  • C. Marois
  • E. L. Nielsen
  • L. Pueyo
  • A. Rajan
  • J. Rameau
  • D. Saumon
  • J. J. Wang
  • J. Patience
  • M. Ammons
  • P. Arriaga
  • E. Artigau
  • S. Beckwith
  • J. Brewster
  • S. Bruzzone
  • J. Bulger
  • A. S. Burrows
  • C. Chen
  • E. Chiang
  • J. K. Chilcote
  • R. I. Dawson
  • R. Dong
  • R. Doyon
  • Z. H. Draper
  • G. Duchêne
  • T. M. Esposito
  • D. Fabrycky
  • M. P. Fitzgerald
  • K. B. Follette
  • J. J. Fortney
  • B. Gerard
  • S. Goodsell
  • A. Z. Greenbaum
  • P. Hibon
  • S. Hinkley
  • T. H. Cotten
  • L. -W. Hung
  • P. Ingraham
  • M. Johnson-Groh
  • P. Kalas
  • D. Lafreniere
  • J. E. Larkin
  • J. Lee
  • M. Line
  • D. Long
  • J. Maire
  • F. Marchis
  • B. C. Matthews
  • C. E. Max
  • S. Metchev
  • M. A. Millar-Blanchaer
  • T. Mittal
  • C. V. Morley
  • K. M. Morzinski
  • R. Murray-Clay
  • R. Oppenheimer
  • D. W. Palmer
  • R. Patel
  • M. D. Perrin
  • L. A. Poyneer
  • R. R. Rafikov
  • F. T. Rantakyrö
  • E. L. Rice
  • P. Rojo
  • A. R. Rudy
  • J. -B. Ruffio
  • M. T. Ruiz
  • N. Sadakuni
  • L. Saddlemyer
  • M. Salama
  • D. Savransky
  • A. C. Schneider
  • A. Sivaramakrishnan
  • I. Song
  • R. Soummer
  • S. Thomas
  • G. Vasisht
  • J. K. Wallace
  • K. Ward-Duong
  • S. J. Wiktorowicz
  • S. G. Wolff
  • B. Zuckerman
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Original languageEnglish
Pages (from-to)64-67
Early online date17 Aug 2015
Publication statusPublished - 2 Oct 2015


Directly detecting thermal emission from young extrasolar planets allows measurement of their atmospheric composition and luminosity, which is influenced by their formation mechanism. Using the Gemini Planet Imager, we discovered a planet orbiting the \$sim$20 Myr-old star 51 Eridani at a projected separation of 13 astronomical units. Near-infrared observations show a spectrum with strong methane and water vapor absorption. Modeling of the spectra and photometry yields a luminosity of L/LS=1.6-4.0 x 10-6 and an effective temperature of 600-750 K. For this age and luminosity, "hot-start" formation models indicate a mass twice that of Jupiter. This planet also has a sufficiently low luminosity to be consistent with the "cold- start" core accretion process that may have formed Jupiter.


This is the Accepted Manuscript of the following article: B. Macintosh, et al., “Discovery and spectroscopy of the young jovian planet 51 Eri b with the Gemini Planet Imager”, Science, Vol. 350(6256): 64-67, August 2015. The final published version is available at: © The Authors


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