The First H-band Spectrum of the Massive Gas Giant Planet beta Pictoris b with the Gemini Planet Imager

Jeffrey Chilcote , Travis Barman , Michael P. Fitzgerald , James R. Graham , James E. Larkin , Bruce Macintosh , Brian Bauman , Adam S. Burrows

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Andrew Cardwell Robert J. De Rosa Daren Dillon Rene Doyon Jennifer Dunn Darren Erikson Donald Gavel Stephen J. Goodsell Markus Hartung Pascale Hibon Patrick Ingraham Paul Kalas Quinn Konopacky J\'er\^ome Maire Franck Marchis Mark S. Marley Christian Marois Max Millar-Blanchaer Katie Morzinski Andrew Norton B. R. Oppenheimer David Palmer Jennifer Patience Marshall D. Perrin Lisa Poyneer Laurent Pueyo Fredrik Rantakyr\"o Naru Sadakuni Leslie Saddlemyer Dmitry Savransky Andrew Serio Anand Sivaramakrishnan Inseok Song Remi Soummer Sandrine Thomas J. Kent Wallace Sloane J. Wiktorowicz Schuyler Wolff

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classification 🌌 astro-ph.EP

keywords h-bandplanetplanetaryspectrumbetafirstgeminigiant

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Using the recently installed Gemini Planet Imager (GPI), we have taken the first H-band spectrum of the planetary companion to the nearby young star beta 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 microns). The spectrum has a resolving power of $\sim$ 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 $1650 \pm 50$ K and a surface gravity of $\log(g) = 4.0 \pm 0.25$ (cgs units). These values agree well with predictions from planetary evolution models for a gas giant with mass between 10 and 12 $M_{\rm Jup}$ and age between 10 and 20 Myrs.

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The First H-band Spectrum of the Massive Gas Giant Planet beta Pictoris b with the Gemini Planet Imager

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