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Title: 1–2.4 μm Near-IR Spectrum of the Giant Planet β Pictoris b Obtained with the Gemini Planet Imager

Journal Article · · The Astronomical Journal (Online)
 [1]; ;  [2]; ; ;  [3]; ;  [4];  [5];  [6];  [7];  [8];  [9];  [10];  [11];  [12];  [13];  [14];
  1. Dunlap Institute for Astronomy and Astrophysics, University of Toronto, Toronto, ON M5S 3H4 (Canada)
  2. Space Telescope Science Institute, Baltimore, MD 21218 (United States)
  3. Astronomy Department, University of California, Berkeley, Berkeley CA 94720 (United States)
  4. Kavli Institute for Particle Astrophysics and Cosmology, Department of Physics, Stanford University, Stanford, CA, 94305 (United States)
  5. Lunar and Planetary Laboratory, University of Arizona, Tucson AZ 85721 (United States)
  6. Lawrence Livermore National Laboratory, 7000 East Ave., Livermore, CA 94550 (United States)
  7. Department of Physics and Astronomy, Centre for Planetary Science and Exploration, University of Western Ontario, London, ON N6A 3K7 (Canada)
  8. Subaru Telescope, NAOJ, 650 North A’ohoku Place, Hilo, HI 96720 (United States)
  9. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
  10. Gemini Observatory, Casilla 603, La Serena (Chile)
  11. Department of Physics and Astronomy, University of Georgia, Athens, GA 30602 (United States)
  12. University of California Observatories/Lick Observatory, University of California, Santa Cruz, Santa Cruz, CA 95064 (United States)
  13. Institut de Recherche sur les Exoplanètes, Départment de Physique, Université de Montréal, Montréal QC H3C 3J7 (Canada)
  14. University of Victoria, 3800 Finnerty Rd., Victoria, BC V8P 5C2 (Canada)
+ Show Author Affiliations

Using the Gemini Planet Imager located at Gemini South, we measured the near-infrared (1.0–2.4 μm) spectrum of the planetary companion to the nearby, young star β Pictoris. We compare the spectrum obtained with currently published model grids and with known substellar objects and present the best matching models as well as the best matching observed objects. Comparing the empirical measurement of the bolometric luminosity to evolutionary models, we find a mass of 12.9 ± 0.2 M{sub Jup}, an effective temperature of 1724 ± 15 K, a radius of 1.46 ± 0.01 R{sub Jup}, and a surface gravity of logg=4.18±0.01 [dex] (cgs). The stated uncertainties are statistical errors only, and do not incorporate any uncertainty on the evolutionary models. Using atmospheric models, we find an effective temperature of 1700–1800 K and a surface gravity of logg=3.5–4.0 [dex] depending upon the model. These values agree well with other publications and with “hot-start” predictions from planetary evolution models. Further, we find that the spectrum of β Pic b best matches a low surface gravity L2 ± 1 brown dwarf. Finally, comparing the spectrum to field brown dwarfs, we find the the spectrum best matches 2MASS J04062677–381210 and 2MASS J03552337+1133437.

OSTI ID:
22863102
Journal Information:
The Astronomical Journal (Online), Vol. 153, Issue 4; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 1538-3881
Country of Publication:
United States
Language:
English

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New constraints on the HR 8799 planetary system from mid-infrared direct imaging journal November 2019
Performance and early science with the Subaru Coronagraphic Extreme Adaptive Optics project conference September 2019
GPI Spectra of HR 8799 c, d, and e from 1.5 to 2.4 μ m with KLIP Forward Modeling journal May 2018
Spitzer Light Curves of the Young, Planetary-mass TW Hya Members 2MASS J11193254–1137466AB and WISEA J114724.10–204021.3 journal May 2018
The Hawaii Infrared Parallax Program. III. 2MASS J0249–0557 c: A Wide Planetary-mass Companion to a Low-mass Binary in the β Pic Moving Group journal July 2018
SCExAO/CHARIS Near-infrared Direct Imaging, Spectroscopy, and Forward-Modeling of κ And b: A Likely Young, Low-gravity Superjovian Companion journal November 2018
The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au journal June 2019
An Updated Visual Orbit of the Directly Imaged Exoplanet 51 Eridani b and Prospects for a Dynamical Mass Measurement with Gaia journal December 2019
Detection of a Low-mass Stellar Companion to the Accelerating A2IV Star HR 1645 journal November 2019
Atmospheric Characterization and Further Orbital Modeling of κ Andromeda b journal January 2020
Population-level Eccentricity Distributions of Imaged Exoplanets and Brown Dwarf Companions: Dynamical Evidence for Distinct Formation Channels journal January 2020
The Gemini Planet Imager Exoplanet Survey: Dynamical Mass of the Exoplanet β Pictoris b from Combined Direct Imaging and Astrometry journal January 2020
ALMA Resolves C i Emission from the β Pictoris Debris Disk journal July 2018
The Gemini Planet Imager Exoplanet Survey: Giant Planet and Brown Dwarf Demographics from 10 to 100 au text January 2019
The exoplanet handbook: Book Review journal March 2012
Spitzer Light Curves of the Young, Planetary-Mass TW Hya Members 2MASS J11193254-1137466AB and WISEA J114724.10-204021.3 text January 2018
The mass of the young planet Pictoris b through the astrometric motion of its host star text January 2018
SCExAO/CHARIS Near-Infrared Direct Imaging, Spectroscopy, and Forward-Modeling of kappa And b: A Likely Young, Low-Gravity Superjovian Companion text January 2018
Performance and Early Science with the Subaru Coronagraphic Extreme Adaptive Optics Project preprint January 2019
An updated visual orbit of the directly-imaged exoplanet 51 Eridani b and prospects for a dynamical mass measurement with Gaia text January 2019
New constraints on the HR 8799 planetary system from mid-infrared direct imaging text January 2019
Population-Level Eccentricity Distributions of Imaged Exoplanets and Brown Dwarf Companions: Dynamical Evidence for Distinct Formation Channels text January 2019
The GJ 504 system revisited: Combining interferometric, radial velocity, and high contrast imaging data text January 2018

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Related Subjects

79 ASTROPHYSICS
COSMOLOGY AND ASTRONOMY
BOLOMETERS
COMPARATIVE EVALUATIONS
FORECASTING
GRAVITATION
IMAGES
INFRARED SPECTRA
LUMINOSITY
MASS
NEAR INFRARED RADIATION
PLANETS
SOLAR SYSTEM EVOLUTION
STARS