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WISE-0458 MIRI/MRS plots and data

On this page you can find some interactive plots and data associated with my paper Matthews et al. 2025, titled HCN and C₂H₂ in the atmosphere of a T8.5+T9 brown dwarf binary.

1. Interactive plot of the data and the best-fit model. Click here for a full-page version.

2. Interactive plot of the data, and several models with and without HCN/C₂H₂ included. Click here for a full-page version.

3. Extracted 1D spectrum, as presented in Matthews et al. 2025. This includes the background systematics correction described in Appendix C of the paper, and treats the binary as an unresolved object. We provide a spectrum at the native resolution of the instrument (Rinst), and a spectrum degraded to R=1000, as used in the retrievals in Matthews et al. 2025 (see paper for details).

   Data at Instrumental Resoluion

   Data at R=1000 (used for retrievals)

4. Best-fit model for W0458 as presented in Matthews et al. 2025, as retrieved with pRT (Mollière et al. 2019, Nasedkin et al. 2024). This model has 21 free parameters, namely: the planet radius, the planet logg, a P-T profile defined by 10 temperature nodes equally spaced between 10³ bar and 10^-5 bar and a gamma-parameter, seven molecular species (H₂O, CH₄, NH₃, HCN, C₂H₂, CO and CO₂), and a b-parameter to allow for uncertainty inflation. The modelling is described in detail in Matthews et al. 2025, and best-fit parameters can be found in Table 1 of the paper.

   Best-fit model spectrum derived with pRT