Details

Autor(en) / Beteiligte

• 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

Titel

SPECTROSCOPIC CHARACTERIZATION OF HD 95086 b WITH THE GEMINI PLANET IMAGER

Ist Teil von

• The Astrophysical journal, 2016-06, Vol.824 (2), p.121-121

Ort / Verlag

United States: The American Astronomical Society

Erscheinungsjahr

2016

Quelle

EZB Electronic Journals Library

Beschreibungen/Notizen

• ABSTRACT We present new H (1.5-1.8 m) photometric and K1 (1.9-2.2 m) 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 ( ) 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 photometry, we compare the spectral energy distribution (SED) 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 color than 2MASS J12073346-3932539 b and HR 8799 c and d, despite having a similar 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 SED of HD 95086 b is best fit by low temperature ( = 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.