Spectroscopic Characterization of HD 95086 b with the Gemini Planet Imager

De Rosa, Robert J.; Rameau, Julien; Patience, Jenny; Graham, James R.; Doyon, René; Lafrenière, David; Macintosh, Bruce; Pueyo, Laurent; Rajan, Abhijith; Wang, Jason J.; Ward-Duong, Kimberly; Hung, Li-Wei; Maire, Jérôme; Nielsen, Eric L.; Ammons, S. Mark; Bulger, Joanna; Cardwell, Andrew; Chilcote, Jeffrey K.; Galvez, Ramon L.; Gerard, Benjamin L.; Goodsell, Stephen; Hartung, Markus; Hibon, Pascale; Ingraham, Patrick; Johnson-Groh, Mara; Kalas, Paul; Konopacky, Quinn M.; Marchis, Franck; Marois, Christian; Metchev, Stanimir; Morzinski, Katie M.; Oppenheimer, Rebecca; Perrin, Marshall D.; Rantakyrö, Fredrik T.; Savransky, Dmitry; Thomas, Sandrine

doi:10.3847/0004-637x/824/2/121

Spectroscopic Characterization of HD 95086 b with the Gemini Planet Imager

De Rosa, Robert J.; Rameau, Julien; Patience, Jenny; Graham, James R.; Doyon, René; Lafrenière, David; Macintosh, Bruce; Pueyo, Laurent; Rajan, Abhijith; Wang, Jason J.; Ward-Duong, Kimberly; Hung, Li-Wei; Maire, Jérôme; Nielsen, Eric L.; Ammons, S. Mark; Bulger, Joanna; Cardwell, Andrew; Chilcote, Jeffrey K.; Galvez, Ramon L.; Gerard, Benjamin L.; Goodsell, Stephen; Hartung, Markus; Hibon, Pascale; Ingraham, Patrick; Johnson-Groh, Mara; Kalas, Paul; Konopacky, Quinn M.; Marchis, Franck; Marois, Christian; Metchev, Stanimir; Morzinski, Katie M.; Oppenheimer, Rebecca; Perrin, Marshall D.; Rantakyrö, Fredrik T.; Savransky, Dmitry; Thomas, Sandrine

Authors

Robert J. De Rosa

Julien Rameau

Jenny Patience

James R. Graham

René Doyon

David Lafrenière

Bruce Macintosh

Laurent Pueyo

Abhijith Rajan

Jason J. Wang

Kimberly Ward-Duong

Li-Wei Hung

Jérôme Maire

Eric L. Nielsen

S. Mark Ammons

Joanna Bulger

Andrew Cardwell

Jeffrey K. Chilcote

Ramon L. Galvez

Benjamin L. Gerard

Dr Stephen Goodsell stephen.goodsell@durham.ac.uk
Programme Manager

Markus Hartung

Pascale Hibon

Patrick Ingraham

Mara Johnson-Groh

Paul Kalas

Quinn M. Konopacky

Franck Marchis

Christian Marois

Stanimir Metchev

Katie M. Morzinski

Rebecca Oppenheimer

Marshall D. Perrin

Fredrik T. Rantakyrö

Dmitry Savransky

Sandrine Thomas

Abstract

We present new H (1.5-1.8 μm) photometric and K1 (1.9-2.2 μm) spectroscopic observations of the young exoplanet HD 95086 b obtained with the Gemini Planet Imager. The H-band magnitude has been significantly improved relative to previous measurements, whereas the low resolution K1 (λ/δλ≈66) spectrum is featureless within the measurement uncertainties, and presents a monotonically increasing pseudo-continuum consistent with a cloudy atmosphere. By combining these new measurements with literature L′ photometry, we compare the spectral energy distribution of the planet to other young planetary-mass companions, field brown dwarfs, and to the predictions of grids of model atmospheres. HD 95086 b is over a magnitude redder in K1−L′ color than 2MASS J12073346-3932539 b and HR 8799 c and d, despite having a similar L′ magnitude. Considering only the near-infrared measurements, HD 95086 b is most analogous to the brown dwarfs 2MASS J2244316+204343 and 2MASS J21481633+4003594, both of which are thought to have dusty atmospheres. Morphologically, the spectral energy distribution of HD 95086 b is best fit by low temperature (Teff= 800-1300 K), low surface gravity spectra from models which simulate high photospheric dust content. This range of effective temperatures is consistent with field L/T transition objects, but the spectral type of HD 95086 b is poorly constrained between early L and late T due to its unusual position the color-magnitude diagram, demonstrating the difficulty in spectral typing young, low surface gravity substellar objects. As one of the reddest such objects, HD 95086 b represents an important empirical benchmark against which our current understanding of the atmospheric properties of young extrasolar planets can be tested.

Citation

De Rosa, R. J., Rameau, J., Patience, J., Graham, J. R., Doyon, R., Lafrenière, D., …Thomas, S. (2016). Spectroscopic Characterization of HD 95086 b with the Gemini Planet Imager. Astrophysical Journal, 824(2), 121-138. https://doi.org/10.3847/0004-637x/824/2/121

Journal Article Type	Article
Acceptance Date	Apr 5, 2016
Online Publication Date	Jun 21, 2016
Publication Date	Jun 21, 2016
Deposit Date	Dec 6, 2016
Publicly Available Date	Jan 26, 2017
Journal	Astrophysical Journal
Print ISSN	0004-637X
Electronic ISSN	1538-4357
Publisher	American Astronomical Society
Peer Reviewed	Peer Reviewed
Volume	824
Issue	2
Article Number	121
Pages	121-138
DOI	https://doi.org/10.3847/0004-637x/824/2/121