SPECTROSCOPIC CHARACTERIZATION OF HD 95086 b WITH THE GEMINI PLANET IMAGER
AuthorDe Rosa, Robert J.
Graham, James R.
Wang, Jason J.
Nielsen, Eric L.
Ammons, S. Mark
Chilcote, Jeffrey K.
Galvez, Ramon L.
Gerard, Benjamin L.
Konopacky, Quinn M.
Morzinski, Katie M.
Perrin, Marshall D.
Rantakyrö, Fredrik T.
AffiliationUniv Arizona, Steward Observ
Univ Arizona, Large Binocular Telescope Observ
Keywordsinfrared: planetary systems
instrumentation: adaptive optics
planets and satellites
individual (HD 95086)
MetadataShow full item record
PublisherIOP PUBLISHING LTD
CitationSPECTROSCOPIC CHARACTERIZATION OF HD 95086 b WITH THE GEMINI PLANET IMAGER 2016, 824 (2):121 The Astrophysical Journal
JournalThe Astrophysical Journal
Rights© 2016. The American Astronomical Society. All rights reserved.
Collection InformationThis item from the UA Faculty Publications collection is made available by the University of Arizona with support from the University of Arizona Libraries. If you have questions, please contact us at firstname.lastname@example.org.
AbstractWe present new H (1.51.8 mu m) photometric and K-1 (1.92.2 mu m) spectroscopic observations of the young exoplanet HD 95086 b obtained with the Gemini Planet Imager. The Hband magnitude has been significantly improved relative to previous measurements, whereas the lowresolution K-1 (lambda/delta lambda approximate to 66) spectrum is featureless within the measurement uncertainties and presents a monotonically increasing pseudocontinuum consistent with a cloudy atmosphere. By combining these new measurements with literature L' photometry, we compare the spectral energy distribution (SED) of the planet to other young planetarymass companions, field brown dwarfs, and to the predictions of grids of model atmospheres. HD 95086 b is over a magnitude redder in K-1 - L' color than 2MASS J120733463932539 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 SED of HD 95086 b is best fit by low temperature (T-eff = 8001300 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 colormagnitude 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.
VersionFinal published version
SponsorsNational Aeronautics and Space Administration; National Science Foundation; NSF [AST-1518332, AST-1411868, DGE-1311230]; NASA [NNX15AD95G/NEXSS, NNX15AC89G, NNX14AJ80G]; Fonds de Recherche du Quebec; U.S. Department of Energy by Lawrence Livermore National Laboratory [DE-AC52-07NA27344]