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• W2574125449 abstract "We present the first results from applying the spectral inversion technique in the cloudy L dwarf regime. Our new framework provides a flexible approach to modelling cloud opacity which can be built incrementally as the data require and improves upon previous retrieval experiments in the brown dwarf regime by allowing for scattering in two-stream radiative transfer. Our first application of the tool to two mid-L dwarfs is able to reproduce their near-infrared spectra far more closely than grid models. Our retrieved thermal, chemical and cloud profiles allow us to estimate |$T_{rm eff} = 1796^{+23}_{-25}$| K and |$log g = 5.21^{+0.05}_{-0.08}$| for 2MASS J05002100+0330501, and for 2MASSW J2224438−015852 we find |$T_{rm eff} = 1723^{+18}_{-19}$| K and |$log g = 5.31^{+0.04}_{-0.08}$|⁠, in close agreement with previous empirical estimates. Our best model for both objects includes an optically thick cloud deck which passes τcloud ≥ 1 (looking down) at a pressure of around 5 bar. The temperature at this pressure is too high for silicate species to condense, and we argue that corundum and/or iron clouds are responsible for this cloud opacity. Our retrieved profiles are cooler at depth and warmer at altitude than the forward grid models that we compare, and we argue that some form of heating mechanism may be at work in the upper atmospheres of these L dwarfs. We also identify anomalously high CO abundance in both targets, which does not correlate with the warmth of our upper atmospheres or our choice of cloud model, and find similarly anomalous alkali abundance for one of our targets. These anomalies may reflect unrecognized shortcomings in our retrieval model or inaccuracies in our gas phase opacities." @default.
• W2574125449 created "2017-01-26" @default.
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• W2574125449 date "2017-05-20" @default.
• W2574125449 modified "2023-10-13" @default.
• W2574125449 title "Retrieval of atmospheric properties of cloudy L dwarfs" @default.
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• W2574125449 doi "https://doi.org/10.1093/mnras/stx1246" @default.
• W2574125449 hasPublicationYear "2017" @default.
• W2574125449 type Work @default.
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