A JWST Panchromatic Thermal Emission Spectrum of the Warm Neptune Archetype GJ 436b

Data Analysis Products

The folder named "Eureka_data_reduction_products" contains Eureka! Control Files (.ecf files) and Eureka! Parameter Files (.epf files) used for the Eureka! reduction of the JWST NIRCam and MIRI eclipse observations of GJ 436 b as presented in Mukherjee et al. 2025 (ApJL).

Our Eureka! NIRCam reductions used version 0.11.dev446+gf5d684ee.d20240712 of Eureka!, version 1.15.1 of the jwst package, and CRDS version 11.17.26 with CRDS context jwst_1253.pmap. Our Eureka! MIRI/LRS reduction used Eureka! version 0.11.dev77+g1e43198f.d20240130, jwst version 1.13.4, CRDS version 11.17.15, and with CRDS context jwst_1188.pmap.

This folder also contains the spectrum derived for the planet from each individual visit and the weighted spectrum used for the modeling analysis in the paper.

In the "tshirt_data_reduction_products." directory, we have included averaged NIRCam and MIRI combined spectra, individual eclipses and spectroscopic lightcurves (as well as lightcurve models) of GJ 436 b for 8 eclipses. We also include the posterior distributions (mean and standard deviation) for the MIRI broadband lightcurve fits from the "Eureka!" reduction.  See the README.txt for a listing of the files and description of the column names and FITS extensions. The methodology and version numbers are further described in Mukherjee et al. 2025 (ApJL).

The folder named "stellar_spectrum" contains the flux calibrated stellar spectrum of host star GJ 436 observed with the NIRCam and MIRI instruments. It also contains the best-fitting BOSZ model used in our analysis.

Model Analysis Products

The folder "RCTE_grid" contains PICASO radiative-convective thermochemical equilibrium models used in the modeling analysis of GJ 436b. This folder contains files with the T(P) and chemical profiles computed for the planet. The spectrum computed from these models are in "spectra_RCTE" folder. Each file has the planet flux in erg/s/cm^3 in the first column, the Fp/Fs in the second and third column.

The folder "photochemistry_grid" contains the 1D photochemical models used in the modeling analysis of GJ 436b. This folder contains files with the T(P) and chemical profiles computed for the planet. The spectrum computed from these models are in "spectra_photochem" folder. Each file has the planet flux in erg/s/cm^3 in the first column, the Fp/Fs in the second and third column.

The spectrum computed from the VIRGA and PICASO cloudy models are in "spectra_cloudy" folder. Each file has the planet flux in erg/s/cm^3 in the first column, the Fp/Fs in the second and third column.