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The first H-band spectrum of the giant planet β Pictoris b

  • Author(s): Chilcote, J
  • Barman, T
  • Fitzgerald, MP
  • Graham, JR
  • Larkin, JE
  • Macintosh, B
  • Bauman, B
  • Burrows, AS
  • Cardwell, A
  • De Rosa, RJ
  • Dillon, D
  • Doyon, R
  • Dunn, J
  • Erikson, D
  • Gavel, D
  • Goodsell, SJ
  • Hartung, M
  • Hibon, P
  • Ingraham, P
  • Kalas, P
  • Konopacky, Q
  • Maire, J
  • Marchis, F
  • Marley, MS
  • Marois, C
  • Millar-Blanchaer, M
  • Morzinski, K
  • Norton, A
  • Oppenheimer, R
  • Palmer, D
  • Patience, J
  • Perrin, M
  • Poyneer, L
  • Pueyo, L
  • Rantakyrö, FT
  • Sadakuni, N
  • Saddlemyer, L
  • Savransky, D
  • Serio, A
  • Sivaramakrishnan, A
  • Song, I
  • Soummer, R
  • Thomas, S
  • Wallace, JK
  • Wiktorowicz, S
  • Wolff, S
  • et al.

© 2015. The American Astronomical Society. All rights reserved. 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 1600-1700K 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 MJup and age between 10 and 20 Myr.

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