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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 4 μm photometric data points, the observations provide strong constraints on the atmospheric methane content for both planets. 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] ;  [5] ;  [6] ;  [7] ; ;  [8] ;  [9] ; ;  [10] ;  [11] ; ; ;  [12] ;  [13] more »; « less
  1. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305 (United States)
  2. NASA Ames Research Center, Moffett Field, CA 94035 (United States)
  3. Los Alamos National Laboratory, Los Alamos, NM 87545 (United States)
  4. NRC Herzberg Astronomy and Astrophysics, 5071 West Saanich Road, Victoria, BC V9E 2E7 (Canada)
  5. Lunar and Planetary Laboratory, University of Arizona, Tucson, Arizona 85721-0092 (United States)
  6. Lawrence Livermore National Lab, 7000 East Avenue, Livermore, CA 94551 (United States)
  7. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
  8. Department of Physics and Astronomy, UCLA, Los Angeles, CA 90095 (United States)
  9. School of Earth and Space Exploration, Arizona State University, PO Box 871404, Tempe, AZ 85287 (United States)
  10. Department of Astronomy, UC Santa Cruz, 1156 High Street, Santa Cruz, CA 95064 (United States)
  11. Department de Physique, Université de Montréal, Montréal QC H3C 3J7 (Canada)
  12. Gemini Observatory, Casilla 603, La Serena (Chile)
  13. Department of Astronomy, UC Berkeley, Berkeley CA, 94720 (United States)
Publication Date:
OSTI Identifier:
22364937
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 794; Journal Issue: 1; Other Information: Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
79 ASTROPHYSICS, COSMOLOGY AND ASTRONOMY; CLOUD COVER; CLOUDS; COMPARATIVE EVALUATIONS; COMPUTERIZED SIMULATION; EMISSION SPECTRA; IMAGES; LIMITING VALUES; METALLICITY; METHANE; OPACITY; OPTICS; PLANETS; RESOLUTION; SATELLITE ATMOSPHERES; SATELLITES; VISIBLE RADIATION