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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.
Abstract

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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