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

Journal Article · · The Astrophysical Journal. Letters (Online)
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  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.
+ Show Author Affiliations

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.

Research Organization:
Univ. of California, Berkeley, CA (United States); Lawrence Livermore National Laboratory (LLNL), Livermore, CA (United States)
Sponsoring Organization:
USDOE
Grant/Contract Number:
AC52-07NA27344
OSTI ID:
1253166
Journal Information:
The Astrophysical Journal. Letters (Online), Vol. 794, Issue 1; ISSN 2041-8213
Publisher:
Institute of Physics (IOP)Copyright Statement
Country of Publication:
United States
Language:
English
Citation Metrics:
Cited by: 49 works
Citation information provided by
Web of Science

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Cited By (28)

First light of the VLT planet finder SPHERE: III. New spectrophotometry and astrometry of the HR 8799 exoplanetary system⋆⋆⋆ journal February 2016
First light of the VLT planet finder SPHERE: IV. Physical and chemical properties of the planets around HR8799⋆ journal February 2016
Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE journal July 2017
SIMULTANEOUS DETECTION OF WATER, METHANE, AND CARBON MONOXIDE IN THE ATMOSPHERE OF EXOPLANET HR 8799 b journal May 2015
Imaging Extrasolar Giant Planets journal August 2016
Gemini Planet Imager observational calibrations XI: pipeline improvements and enhanced calibrations after two years on sky conference August 2016
The Exoplanet Simple Orbit Fitting Toolbox (ExoSOFT): An Open-source Tool for Efficient Fitting of Astrometric and Radial Velocity Data journal March 2017
1–2.4 μ m Near-IR Spectrum of the Giant Planet β Pictoris b Obtained with the Gemini Planet Imager journal March 2017
HELIOS–RETRIEVAL: An Open-source, Nested Sampling Atmospheric Retrieval Code; Application to the HR 8799 Exoplanets and Inferred Constraints for Planet Formation journal August 2017
A Direct Imaging Survey of Spitzer -detected Debris Disks: Occurrence of Giant Planets in Dusty Systems journal November 2017
Cloud Atlas: Rotational Modulations in the L/T Transition Brown Dwarf Companion HN Peg B journal February 2018
GPI Spectra of HR 8799 c, d, and e from 1.5 to 2.4 μ m with KLIP Forward Modeling journal May 2018
The LEECH Exoplanet Imaging Survey: Limits on Planet Occurrence Rates under Conservative Assumptions journal November 2018
Cloud Atlas: High-contrast Time-resolved Observations of Planetary-mass Companions journal February 2019
The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au journal June 2019
High Spatial Resolution Thermal Infrared Spectroscopy with ALES: Resolved Spectra of the Benchmark Brown Dwarf Binary HD 130948BC journal May 2019
Resolved Millimeter Observations of the HR 8799 Debris Disk journal March 2018
The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au text January 2019
Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE text January 2017
The exoplanet handbook: Book Review journal March 2012
Simultaneous Detection of Water, Methane and Carbon Monoxide in the Atmosphere of Exoplanet HR8799b text January 2015
First light of the VLT planet finder SPHERE. IV. Physical and chemical properties of the planets around HR8799 text January 2015
First light of the VLT planet finder SPHERE. III. New spectrophotometry and astrometry of the HR8799 exoplanetary system text January 2015
Imaging Extrasolar Giant Planets text January 2016
Spectral and atmospheric characterization of 51 Eridani b using VLT/SPHERE text January 2017
Cloud Atlas: Rotational Modulations in the L/T Transition Brown Dwarf Companion HN Peg B text January 2018
The LEECH Exoplanet Imaging Survey: Limits on Planet Occurrence Rates Under Conservative Assumptions text January 2018
Combining angular differential imaging and accurate polarimetry with SPHERE/IRDIS to characterize young giant exoplanets text January 2017

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