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Title:
The properties of the T8.5p dwarf Ross 458C
Authors:
Burningham, Ben; Leggett, S. K.; Homeier, D.; Saumon, D.; Lucas, P. W.; Pinfield, D. J.; Tinney, C. G.; Allard, F.; Marley, M. S.; Jones, H. R. A.; Murray, D. N.; Ishii, M.; Day-Jones, A.; Gomes, J.; Zhang, Z. H.
Affiliation:
AA(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AB(Gemini Observatory, 670 N. A'ohoku Place, Hilo, HI 96720, USA), AC(Los Alamos National Laboratory, PO Box 1663, MS F663, Los Alamos, NM 87545, USA), AD(Institut für Astrophysik, Georg-August-Universitat, Friedrich-Hund-Platz 1, 37077 Gottingen, Germany), AE(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AF(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AG(School of Physics, The University of New South Wales, Sydney, NSW 2052, Australia), AH(CRAL (UMR 5574 CNRS), Ecole Normale Superieure, 69364 Lyon Cedex 07, France), AI(NASA Ames Research Center, Mail Stop 245-3, Moffett Field, CA 94035, USA), AJ(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AK(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AL(Subaru Telescope, 650 North A'ohoku Place, Hilo, HI 96720, USA), AM(Universidad de Chile, Camino el Observatorio # 1515, Santiago, Chile, Casilla 36-D), AN(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB), AO(Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire, Hatfield AL10 9AB)
Publication:
Monthly Notices of the Royal Astronomical Society, Volume 414, Issue 4, pp. 3590-3598. (MNRAS Homepage)
Publication Date:
07/2011
Origin:
WILEY
Astronomy Keywords:
surveys, brown dwarfs, stars: low-mass
Abstract Copyright:
© 2011 The Authors Monthly Notices of the Royal Astronomical Society © 2011 RAS
DOI:
10.1111/j.1365-2966.2011.18664.x
Bibliographic Code:
2011MNRAS.414.3590B

Abstract

We present near-infrared photometry and spectroscopy, and warm-Spitzer IRAC photometry of the young very cool T dwarf Ross 458C, which we have typed as T8.5p. By applying the fiducial age constraints (<=1 Gyr) imposed by the properties of the active M dwarf Ross 458A, we have used these data to determine that Ross 458C has Teff= 695 ± 60 K, log g= 4.0-4.7 and an inferred mass of 5-20MJ. We have compared fits of the near-infrared spectrum and IRAC photometry to the BT Settl and Saumon & Marley model grids, and have found that both sets provide best fits that are consistent with our derived properties, whilst the former provide a marginally closer match to the data for all scenarios explored here. The main difference between the model grids arises in the 4.5-mum region, where the BT Settl models are able to better predict the flux through the IRAC filter, suggesting that non-equilibrium effects on the CO-CO2 ratio are important for shaping the mid-infrared spectra of very cool T dwarfs. We have also revisited the issue of the dust opacity in the spectra of Ross 458C that was raised by Burgasser et al. We have found that the BT Settl models which also incorporate a condensate cloud model provide a better match to the near-infrared spectrum of this target than the Saumon & Marley model with fsed= 2 and we briefly discuss the influence of condensate clouds on T dwarf spectra.
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