SIMBAD references

2005A&A...436L..39S - Astronomy and Astrophysics, volume 436, L39-42 (2005/6-3)

The cool atmospheres of the binary brown dwarf ε Indi B.

STERZIK M.F., PANTIN E., HARTUNG M., HUELAMO N., KAEUFL H.U., KAUFER A., MELO C., NUERNBERGER D., SIEBENMORGEN R. and SMETTE A.

Abstract (from CDS):

We have imaged ε Indi B, the closest brown dwarf binary known, with VISIR at the VLT in three narrow-band mid-infrared bandpasses located around 8.6µm, 10.5µm and 11.3µm. 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 NH3 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 ε IndiBb is in good agreement with recent ``cloud-free'' atmosphere models having an effective temperature of Teff=800K. With an assumed age of 1Gyr for the ε Indi system, component Ba agrees more with Teff≃1100K rather than with Teff=1200K, as suggested by SPITZER spectroscopic observations of the combined ε Indi B system (Roellig et al., 2004ApJS..154..418R). Even higher effective temperatures appear inconsistent with our absolute photometry, as they would imply an unphysical small size of the brown dwarf ε Indi Ba.

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Journal keyword(s): stars: low-mass, brown dwarfs - stars: binaries: general

Simbad objects: 4

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