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28 March 2024
 
  » arxiv » astro-ph/0503297

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The cool atmospheres of the binary brown dwarf eps Indi B
M.F. Sterzik ; E. Pantin ; M. Hartung ; N. Huelamo ; H.U. Kaeufl ; A. Kaufer ; C. Melo ; D. Nuernberger ; R. Siebenmorgen ; A. Smette ;
Date 14 Mar 2005
Subject astro-ph
AbstractWe have imaged $epsilon$ Indi B, the closest brown dwarf binary known, with VISIR at the VLT in three narrow-band mid-infrared bandpasses located around 8.6$mu$m, 10.5$mu$m and 11.3$mu$m. We are able to spatially resolve both components, and determine accurate mid-infrared photometry for both components independently. In particular, our VISIR observations probe the NH$_3$ feature in the atmospheres of the cooler and warmer brown dwarfs. For the first time, we can disentangle the contributions of the two components, and find that % our photometry of $epsilon$ IndiBb is in good agreement with recent ``cloud-free’’ atmosphere models having an effective temperature of $T_mathrm{eff}=800$ K. With an assumed age of 1 Gyr for the $epsilon$ Indi system, component Ba agrees more with $T_mathrm{eff} approx 1100$ K rather than with $T_mathrm{eff}=1200$ K, as suggested by SPITZER spectroscopic observations of the combined $epsilon$ Indi B system (Roellig et al., 2004). Even higher effective temperatures appear inconsistent with our absolute photometry, as they would imply an unphysical small size of the brown dwarf $epsilon$ IndiBa.
Source arXiv, astro-ph/0503297
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