THE FIRST H-BAND SPECTRUM OF THE GIANT PLANET β PICTORIS b
- Department of Physics and Astronomy, University of California, Los Angeles, CA 90095 (United States)
- Lunar and Planetary Laboratory, University of Arizona, Tucson, AZ 85721 (United States)
- Astronomy Department, University of California, Berkeley, CA 94720 (United States)
- Kavli Institute for Particle Astrophysics and Cosmology, Stanford University, Stanford, CA 94305 (United States)
- Lawrence Livermore National Laboratory, Livermore, CA 94551 (United States)
- Department of Astrophysical Sciences, Princeton University, Princeton, NJ 08544 (United States)
- Gemini Observatory, Casilla 603, La Serena (Chile)
- School of Earth and Space Exploration, Arizona State University, P.O. Box 871404, Tempe, AZ 85287 (United States)
- University of California Observatories/Lick Observatory, University of California, Santa Cruz, CA 95064 (United States)
- Observatoire du Mont-M'egantic and D'epartement de physique Universit'e de Montr'eal, Montr'eal, QC H3T 1J4 (Canada)
- National Research Council of Canada Herzberg, 5071 West Saanich Road, Victoria, BC V9E 2E7 (Canada)
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.
- OSTI ID:
- 22364764
- Journal Information:
- Astrophysical Journal Letters, Vol. 798, Issue 1; Other Information: Country of input: International Atomic Energy Agency (IAEA); ISSN 2041-8205
- Country of Publication:
- United States
- Language:
- English
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