Gemini Planet Imager Spectroscopy of the HR 8799 planets c and d

Patrick Ingraham , Mark S. Marley , Didier Saumon , Christian Marois , Bruce Macintosh , Travis Barman , Brian Bauman , Adam Burrows

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Jeffrey K. Chilcote Robert J. De Rosa Daren Dillon Rene Doyon Jennifer Dunn Darren Erikson Michael P. Fitzgerald Donald Gavel Stephen J. Goodsell James R. Graham Markus Hartung Pascale Hibon Paul G. Kalas Quinn Konopacky James A. Larkin Jerome Maire Franck Marchis James McBride Max Millar-Blanchaer Katie M. Morzinski Andrew Norton Rebecca Oppenheimer Dave W. Palmer Jenny Patience Marshall D. Perrin Lisa A. Poyneer Laurent Pueyo Fredrik Rantakyro Naru Sadakuni Leslie Saddlemyer Dmitry Savransky Remi Soummer Anand Sivaramakrishnan Inseok Song Sandrine Thomas J. Kent Wallace Sloane J. Wiktorowicz Schuyler G. Wolff

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classification 🌌 astro-ph.EP

keywords cloudplanetplanetscombineddatageminiimagerobservations

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During the first-light run of the Gemini Planet Imager (GPI) we obtained K-band spectra of exoplanets HR 8799 c and d. Analysis of the spectra indicates that planet d may be warmer than planet c. Comparisons to recent patchy cloud models and previously obtained observations over multiple wavelengths confirm that thick clouds combined with horizontal variation in the cloud cover generally reproduce the planets' spectral energy distributions. When combined with the 3 to 4 um photometric data points, the observations provide strong constraints on the atmospheric methane content for both planets. The data also provide further evidence that future modeling efforts must include cloud opacity, possibly including cloud holes, disequilibrium chemistry, and super-solar metallicity.

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Gemini Planet Imager Spectroscopy of the HR 8799 planets c and d

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