Upper panel: reconstructed transmission spectrum of GJ3470b. The Uspec and F972N20 data points are extracted from our LBC light curves (blue circles), the g′RcIcJ points from Fukui et al. (2013) (green circles), and the 4.5 μm point from Demory et al. (2013) (red circle). The model plotted with a dark green line is scaled from a Howe & Burrows (2012) model computed for a 10-M⊕ cloud-free, haze-free planet with Teq = 700 K and a pure water (H2O) atmosphere. The open squares represent the model points integrated over the instrumental passbands. Second panel: same as above, but with a cloud-free, haze-free, metal-poor atmosphere dominated by H and He, computed by the same authors (orange line). Abundances are scaled from the solar ones (Z = 0.3 × Z⊙). Third panel: same as above, but adding the contribution of a scattering haze from Tholin particles at 1 μbar. Lower panel: instrumental passbands employed for each data point.
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