SPECTROSCOPIC CHARACTERIZATION of HD 95086 b with the GEMINI PLANET IMAGER

Robert J. De Rosa, Julien Rameau, Jennifer Patience, James R. Graham, René Doyon, David Lafreniére, 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. GerardStephen Goodsell, 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

Research output: Contribution to journalArticle

28 Scopus citations

Abstract

We present new H (1.5-1.8 μm) photometric and K 1 (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 K 1 () 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.

Original languageEnglish (US)
Article number121
JournalAstrophysical Journal
Volume824
Issue number2
DOIs
StatePublished - Jun 20 2016

Keywords

  • infrared: planetary systems
  • instrumentation: adaptive optics
  • planets and satellites: atmospheres
  • stars: individual (HD 95086)

ASJC Scopus subject areas

  • Astronomy and Astrophysics
  • Space and Planetary Science

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    De Rosa, R. J., Rameau, J., Patience, J., Graham, J. R., Doyon, R., Lafreniére, D., MacIntosh, B., Pueyo, L., Rajan, A., Wang, J. J., Ward-Duong, K., Hung, L. W., Maire, J., Nielsen, E. L., Ammons, S. M., Bulger, J., Cardwell, A., Chilcote, J. K., Galvez, R. L., ... Thomas, S. (2016). SPECTROSCOPIC CHARACTERIZATION of HD 95086 b with the GEMINI PLANET IMAGER. Astrophysical Journal, 824(2), [121]. https://doi.org/10.3847/0004-637X/824/2/121