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The properties of the T8.5p dwarf Ross 458C

Identifieur interne : 004438 ( PascalFrancis/Curation ); précédent : 004437; suivant : 004439

The properties of the T8.5p dwarf Ross 458C

Auteurs : Ben Burningham [Royaume-Uni] ; S. K. Leggett [États-Unis] ; D. Homeier [États-Unis] ; D. Saumon [Allemagne] ; P. W. Lucas [Royaume-Uni] ; D. J. Pinfield [Royaume-Uni] ; C. G. Tinney [Australie] ; F. Allard [France] ; M. S. Marley [États-Unis] ; H. R. A. Jones [Royaume-Uni] ; D. N. Murray [Royaume-Uni] ; M. Ishii [États-Unis] ; A. Day-Jones [Chili] ; J. Gomes [Royaume-Uni] ; Z. H. Zhang [Royaume-Uni]

Source :

RBID : Pascal:11-0320606

Descripteurs français

English descriptors

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-μm 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.
pA  
A01 01  1    @0 0035-8711
A02 01      @0 MNRAA4
A03   1    @0 Mon. Not. R. Astron. Soc.
A05       @2 414
A06       @2 4
A08 01  1  ENG  @1 The properties of the T8.5p dwarf Ross 458C
A11 01  1    @1 BURNINGHAM (Ben)
A11 02  1    @1 LEGGETT (S. K.)
A11 03  1    @1 HOMEIER (D.)
A11 04  1    @1 SAUMON (D.)
A11 05  1    @1 LUCAS (P. W.)
A11 06  1    @1 PINFIELD (D. J.)
A11 07  1    @1 TINNEY (C. G.)
A11 08  1    @1 ALLARD (F.)
A11 09  1    @1 MARLEY (M. S.)
A11 10  1    @1 JONES (H. R. A.)
A11 11  1    @1 MURRAY (D. N.)
A11 12  1    @1 ISHII (M.)
A11 13  1    @1 DAY-JONES (A.)
A11 14  1    @1 GOMES (J.)
A11 15  1    @1 ZHANG (Z. H.)
A14 01      @1 Centre for Astrophysics Research, Science and Technology Research Institute, University of Hertfordshire @2 Hatfield AL10 9AB @3 GBR @Z 1 aut. @Z 5 aut. @Z 6 aut. @Z 10 aut. @Z 11 aut. @Z 14 aut. @Z 15 aut.
A14 02      @1 Gemini Observatory, 670 N. A'ohoku Place @2 Hilo, HI 96720 @3 USA @Z 2 aut.
A14 03      @1 Los Alamos National Laboratory, PO Box 1663, MS F663 @2 Los Alamos, NM 87545 @3 USA @Z 3 aut.
A14 04      @1 Institut fur Astrophysik, Georg-August-Universitat, Friedrich-Hund-Platz 1 @2 37077 Gottingen @3 DEU @Z 4 aut.
A14 05      @1 School of Physics, The University of New South Wales @2 Sydney, NSW 2052 @3 AUS @Z 7 aut.
A14 06      @1 CRAL (UMR 5574 CNRS), Ecole Normale Superieure @2 69364 Lyon @3 FRA @Z 8 aut.
A14 07      @1 NASA Ames Research Center, Mail Stop 245-3 @2 Moffett Field, CA 94035 @3 USA @Z 9 aut.
A14 08      @1 Subaru Telescope, 650 North A'ohoku Place @2 Hilo, HI 96720 @3 USA @Z 12 aut.
A14 09      @1 Universidad de Chile, Camino el Observatorio # 1515 @2 Santiago, Casilla @3 CHL @Z 13 aut.
A20       @1 3590-3598
A21       @1 2011
A23 01      @0 ENG
A43 01      @1 INIST @2 2067 @5 354000190477460630
A44       @0 0000 @1 © 2011 INIST-CNRS. All rights reserved.
A45       @0 1/2 p.
A47 01  1    @0 11-0320606
A60       @1 P
A61       @0 A
A64 01  1    @0 Monthly Notices of the Royal Astronomical Society
A66 01      @0 USA
C01 01    ENG  @0 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-μm 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.
C02 01  3    @0 001E03
C03 01  3  FRE  @0 Spectrométrie IR @5 26
C03 01  3  ENG  @0 Infrared spectroscopy @5 26
C03 02  X  FRE  @0 Photométrie IR @5 27
C03 02  X  ENG  @0 Infrared photometry @5 27
C03 02  X  SPA  @0 Fotometría IR @5 27
C03 03  X  FRE  @0 Age @5 28
C03 03  X  ENG  @0 Age @5 28
C03 03  X  SPA  @0 Edad @5 28
C03 04  X  FRE  @0 Spectre IR proche @5 29
C03 04  X  ENG  @0 Near infrared spectrum @5 29
C03 04  X  SPA  @0 Espectro IR próximo @5 29
C03 05  X  FRE  @0 Modèle @5 30
C03 05  X  ENG  @0 Models @5 30
C03 05  X  SPA  @0 Modelo @5 30
C03 06  3  FRE  @0 Spectre IR @5 31
C03 06  3  ENG  @0 Infrared spectra @5 31
C03 07  3  FRE  @0 Opacité @5 32
C03 07  3  ENG  @0 Opacity @5 32
C03 08  3  FRE  @0 Naine brune @5 33
C03 08  3  ENG  @0 Brown dwarf stars @5 33
C03 09  3  FRE  @0 Etoile faible masse @5 34
C03 09  3  ENG  @0 Low-mass stars @5 34
N21       @1 220
N44 01      @1 OTO
N82       @1 OTO

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<term>Age</term>
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<div type="abstract" xml:lang="en">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 T
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. 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-μm 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-CO
<sub>2</sub>
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<sub>eff</sub>
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<sub>J</sub>
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