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Journal Articles The Astronomical Journal Year : 2017

Characterizing 51 Eri b from 1 to 5 μm: A Partly Cloudy Exoplanet

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Abhijith Rajan
  • Function : Author
Julien Rameau
  • Function : Author
Robert J. de Rosa
  • Function : Author
Mark S. Marley
  • Function : Author
James R. Graham
  • Function : Author
Bruce Macintosh
Christian Marois
Caroline Morley
  • Function : Author
Jennifer Patience
  • Function : Author
Laurent Pueyo
  • Function : Author
Didier Saumon
  • Function : Author
Kimberly Ward-Duong
  • Function : Author
S. Mark Ammons
  • Function : Author
Pauline Arriaga
Vanessa P. Bailey
  • Function : Author
Travis Barman
  • Function : Author
Joanna Bulger
  • Function : Author
Adam S. Burrows
  • Function : Author
Jeffrey Chilcote
Tara Cotten
  • Function : Author
Ian Czekala
  • Function : Author
Rene Doyon
  • Function : Author
Thomas M. Esposito
  • Function : Author
Michael P. Fitzgerald
  • Function : Author
Katherine B. Follette
  • Function : Author
Jonathan J. Fortney
  • Function : Author
Stephen J. Goodsell
  • Function : Author
Alexandra Z. Greenbaum
  • Function : Author
Pascale Hibon
  • Function : Author
Li-Wei Hung
  • Function : Author
Patrick Ingraham
  • Function : Author
Mara Johnson-Groh
  • Function : Author
Paul Kalas
Quinn Konopacky
  • Function : Author
David Lafrenière
James E. Larkin
  • Function : Author
Jérôme Maire
  • Function : Author
Franck Marchis
Stanimir Metchev
  • Function : Author
Maxwell A. Millar-Blanchaer
  • Function : Author
Katie M. Morzinski
  • Function : Author
Eric L. Nielsen
  • Function : Author
Rebecca Oppenheimer
  • Function : Author
David Palmer
  • Function : Author
Rahul I. Patel
  • Function : Author
Marshall Perrin
Lisa Poyneer
  • Function : Author
Fredrik T. Rantakyrö
  • Function : Author
Jean-Baptiste Ruffio
  • Function : Author
Dmitry Savransky
  • Function : Author
Adam C. Schneider
  • Function : Author
Anand Sivaramakrishnan
  • Function : Author
Inseok Song
  • Function : Author
Rémi Soummer
Sandrine Thomas
  • Function : Author
Gautam Vasisht
  • Function : Author
J. Kent Wallace
  • Function : Author
Jason J. Wang
  • Function : Author
Sloane Wiktorowicz
Schuyler Wolff

Abstract

We present spectrophotometry spanning 1-5 μm of 51 Eridani b, a 2-10 {M}{Jup} planet discovered by the Gemini Planet Imager Exoplanet Survey. In this study, we present new K1 (1.90-2.19 μm) and K2 (2.10-2.40 μm) spectra taken with the Gemini Planet Imager as well as an updated L P (3.76 μm) and new M S (4.67 μm) photometry from the NIRC2 Narrow camera. The new data were combined with J (1.13-1.35 μm) and H (1.50-1.80 μm) spectra from the discovery epoch with the goal of better characterizing the planet properties. The 51 Eri b photometry is redder than field brown dwarfs as well as known young T-dwarfs with similar spectral type (between T4 and T8), and we propose that 51 Eri b might be in the process of undergoing the transition from L-type to T-type. We used two complementary atmosphere model grids including either deep iron/silicate clouds or sulfide/salt clouds in the photosphere, spanning a range of cloud properties, including fully cloudy, cloud-free, and patchy/intermediate-opacity clouds. The model fits suggest that 51 Eri b has an effective temperature ranging between 605 and 737 K, a solar metallicity, and a surface gravity of log(g) = 3.5-4.0 dex, and the atmosphere requires a patchy cloud atmosphere to model the spectral energy distribution (SED). From the model atmospheres, we infer a luminosity for the planet of -5.83 to -5.93 ({log}L/{L}), leaving 51 Eri b in the unique position of being one of the only directly imaged planets consistent with having formed via a cold-start scenario. Comparisons of the planet SED against warm-start models indicate that the planet luminosity is best reproduced by a planet formed via core accretion with a core mass between 15 and 127 {M}\oplus .

Dates and versions

insu-03692496 , version 1 (09-06-2022)

Identifiers

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Abhijith Rajan, Julien Rameau, Robert J. de Rosa, Mark S. Marley, James R. Graham, et al.. Characterizing 51 Eri b from 1 to 5 μm: A Partly Cloudy Exoplanet. The Astronomical Journal, 2017, 154, ⟨10.3847/1538-3881/aa74db⟩. ⟨insu-03692496⟩
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