2010
DOI: 10.1051/0004-6361/200912981
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$\mathsf{\varepsilon}$ Indi Ba, Bb: a detailed study of the nearest known brown dwarfs

Abstract: The discovery of ε Indi Ba, Bb, a binary brown dwarf system very close to the Sun, makes possible a concerted campaign to characterise the physical parameters of two T dwarfs. Recent observations suggest substellar atmospheric and evolutionary models may be inconsistent with observations, but there have been few conclusive tests to date. We therefore aim to characterise these benchmark brown dwarfs to place constraints on such models. We have obtained high angular resolution optical, near-infrared, and thermal… Show more

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Cited by 90 publications
(106 citation statements)
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References 107 publications
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“…Spectroscopic comparison with the strength of CO and CH 4 features, e. g. in Figs. 25, 26 of King et al (2010) demonstrates that these latter chemical models with relatively fast rates are most consistent with observations.…”
Section: Disequilibrium Chemistrysupporting
confidence: 56%
“…Spectroscopic comparison with the strength of CO and CH 4 features, e. g. in Figs. 25, 26 of King et al (2010) demonstrates that these latter chemical models with relatively fast rates are most consistent with observations.…”
Section: Disequilibrium Chemistrysupporting
confidence: 56%
“…In atmosphere models of the T1 brown dwarf Indi Ba based on this approach, we obtain characteristic values of 10 7 ≤ D ≤ 10 8 cm 2 s −1 for the transition region from CO-to CH 4 -dominated carbon chemistry. We found the resulting nonequilibrium abundances of CO in the line-forming region, using an updated and more efficient reaction model than Saumon et al (2006), to just slightly underestimate the observed CO line strengths in this benchmark transition dwarf (King et al 2010). This indicates that somewhat more efficient mixing than provided by overshoot alone is required, thus supporting an additional contribution from gravity waves.…”
Section: Diffusion Coefficient Estimatementioning
confidence: 91%
“…The high quality data of Indi Ba (T0-T2) and Bb (T6-T6.5) published by King et al (2010) were used after a suitable convolution with a Gaussian function for the spectral degradation to the resolution of R = 200, which is close to that of the osiris spectrum. Because the binary Indi Bab (McCaughrean et al 2004) is a companion to the nearby, well-known K4.5V star Indi (Scholz et al 2003), the system has been deeply studied in the literature (King et al 2010, and references therein); the two T dwarfs can be used as templates. The lack of lithium absorption at 670.82 nm in their atmospheres provides solid evidence of their old ages and therefore high gravity nature.…”
Section: A S Ori 70mentioning
confidence: 99%
“…The horizontal error bars of the photometry stand for the filter bandwidths. The temperatures are given in K. Figure 2) is compared with the spectra (magenta) of Indi Ba (T0-T2, top) and Indi Bb (T6-T6.5, bottom) of King et al (2010). The comparison data, normalized to unity at around 920 nm, were degraded to the resolution of S Ori 70.…”
Section: A S Ori 70mentioning
confidence: 99%