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Title: Gemini Planet Imager Spectroscopy of the HR 8799 Planets c and d

During the first-light run of the Gemini Planet Imager we obtained K-band spectra of exoplanets HR 8799 c and d. Analysis of the spectra indicates that planet d may be warmer than planet c. Comparisons to recent patchy cloud models and previously obtained observations over multiple wavelengths confirm that thick clouds combined with horizontal variation in the cloud cover generally reproduce the planets’ spectral energy distributions.When combined with the 3 to 4μm photometric data points, the observations provide strong constraints on the atmospheric methane content for both planets. Lastly, the data also provide further evidence that future modeling efforts must include cloud opacity, possibly including cloud holes, disequilibrium chemistry, and super-solar metallicity.
Authors:
 [1] ;  [2] ;  [3] ;  [4] ;  [1] ;  [5] ;  [6] ;  [7] ;  [8] ;  [9] ;  [10] ;  [11] ;  [4] ;  [4] ;  [8] ;  [10] ;  [12] ;  [13] ;  [12] ;  [12] more »;  [13] ;  [14] ;  [15] ;  [14] ;  [16] ;  [13] ;  [14] ;  [5] ;  [10] ;  [10] ;  [6] ;  [17] ;  [18] ;  [6] ;  [18] ;  [12] ;  [12] ;  [4] ;  [19] ;  [18] ;  [18] ;  [20] ;  [21] ;  [22] ;  [10] ;  [18] « less
  1. Stanford Univ., CA (United States). Kavli Institute for Particle Astrophysics and Cosmology
  2. NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States)
  3. Los Alamos National Lab. (LANL), Los Alamos, NM (United States)
  4. NRC Herzberg Astronomy and Astrophysics,Victoria, BC (Canada)
  5. Univ. of Arizona, Tucson, AZ (United States)
  6. Lawrence Livermore National Lab. (LLNL), Livermore, CA (United States)
  7. Princeton Univ., NJ (United States)
  8. Univ. of California, Los Angeles, CA (United States)
  9. Arizona State Univ., Tempe, AZ (United States); Univ. of Exeter, Exeter (United Kingdom)
  10. Univ. of California, Santa Cruz, CA (United States)
  11. Univ. of Montreal, Quebec (Canada)
  12. Gemini Observatory, La Serena (Chile)
  13. Univ. of California, Berkeley, CA (United States)
  14. Univ. of Toronto, ON (Canada)
  15. Univ. of California, Los Angeles, CA (United States
  16. SETI Institute, Mountain View, CA (United States). Carl Sagan Center
  17. Arizona State Univ., Tempe, AZ (United States). School of Earth and Space Exploration
  18. Space Telescope Science Institute, Baltimore, MD (United States)
  19. Cornell Univ., Ithaca, NY (United States). Sibley School of Mechanical and Aerospace Engineering
  20. Univ. of Georgia, Athens, GA (United States). Department of Physics and Astronomy
  21. NASA Ames Research Center (ARC), Moffett Field, Mountain View, CA (United States); Univ. of California, Santa Cruz (UARC), CA (United States)
  22. California Inst. of Technology (CalTech), Pasadena, CA (United States). Jet Propulsion Lab.
Publication Date:
OSTI Identifier:
1253166
Grant/Contract Number:
AC52-07NA27344
Type:
Accepted Manuscript
Journal Name:
The Astrophysical Journal. Letters
Additional Journal Information:
Journal Volume: 794; Journal Issue: 1; Journal ID: ISSN 2041-8213
Publisher:
Institute of Physics (IOP)
Research Org:
Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Org:
USDOE
Country of Publication:
United States
Language:
English
Subject:
gaseous planets; planets and satellites; infrared planetary systems; adaptive optics