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JWST Spectral Retrieval of Cold Directly Imaged Planet WD 0806 b and the First Measurement of Altitude-dependent Kzz in Exoplanet Atmospheres

  • Authors: Ben W.P. Lew, Thomas Roellig, Natasha E. Batalha, Nicholas F. Wogan, Thomas Greene, Mark S. Marley, Jonathan J. Fortney, Jarron Leisenring, Doug Johnstone, Matthew De Furio, Klaus Hodapp, Charles Beichman, Marcia Rieke

Ben W.P. Lew et al 2026 The Astronomical Journal 171 .

  • Provider: AAS Journals

Caption: Figure 10.

Our retrieved and the inferred elemental abundance ratios normalized to the solar value of M. Asplund et al. (2021). The P/H ratio is a 3σ upper limit. The blue shaded regions denote the 1σ, 2σ, and 3σ interval range of the retrieved C/H ratio. After correcting for nondetected molecules and atmospheric processes as described in Section 4.4, the inferred C/H, N/H, O/H, S/H, and C/S values agree to each other within uncertainties. The retrieved and inferred C/O ratios are both above the solar value even after accounting for oxygen sequestration during silicate cloud formation.

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