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Title: THE FIRST H-BAND SPECTRUM OF THE GIANT PLANET β PICTORIS b

Using the recently installed Gemini Planet Imager (GPI), we have obtained the first H-band spectrum of the planetary companion to the nearby young star β Pictoris. GPI is designed to image and provide low-resolution spectra of Jupiter-sized, self-luminous planetary companions around young nearby stars. These observations were taken covering the H band (1.65 μm). The spectrum has a resolving power of ∼45 and demonstrates the distinctive triangular shape of a cool substellar object with low surface gravity. Using atmospheric models, we find an effective temperature of 1600-1700 K and a surface gravity of log (g) = 3.5-4.5 (cgs units). These values agree well with ''hot-start'' predictions from planetary evolution models for a gas giant with mass between 10 and 12 M {sub Jup} and age between 10 and 20 Myr.
Authors:
; ;  [1] ;  [2] ; ;  [3] ; ;  [4] ;  [5] ;  [6] ; ; ;  [7] ;  [8] ; ;  [9] ;  [10] ; ;  [11] ;  [12] more »; « less
  1. Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)
  2. Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721 (United States)
  3. Astronomy Department, University of California, Berkeley, CA 94720 (United States)
  4. Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305 (United States)
  5. Lawrence Livermore National Laboratory, Livermore, CA 94551 (United States)
  6. Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
  7. Gemini Observatory, Casilla 603, La Serena (Chile)
  8. School of Earth and Space Exploration, Arizona State University, P.O. Box 871404, Tempe, AZ 85287 (United States)
  9. University of California Observatories/Lick Observatory, University of California, Santa Cruz, CA 95064 (United States)
  10. Observatoire du Mont-M'egantic and D'epartement de physique Universit'e de Montr'eal, Montr'eal, QC H3T 1J4 (Canada)
  11. National Research Council of Canada Herzberg, 5071 West Saanich Road, Victoria, BC V9E 2E7 (Canada)
  12. Gemini Observatory, 670 North A'ohoku Place, Hilo, HI 96720 (United States)
Publication Date:
OSTI Identifier:
22364764
Resource Type:
Journal Article
Resource Relation:
Journal Name: Astrophysical Journal Letters; Journal Volume: 798; 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; EMISSION SPECTRA; GRAVITATION; IMAGES; JUPITER PLANET; MASS; OPTICS; PLANETARY ATMOSPHERES; RESOLUTION; SOLAR SYSTEM EVOLUTION; STARS