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A Second Visit to Eps Ind Ab with JWST: New Photometry Confirms Ammonia and Suggests Thick Clouds in the Exoplanet Atmosphere of the Closest Super-Jupiter

  • Authors: Elisabeth C. Matthews, James Mang, Aarynn L. Carter, Mathlide Mâlin, Caroline V. Morley, Bhavesh Rajpoot, Leindert A. Boogaard, Jennifer A. Burt, Ian J. M. Crossfield, Fabo Feng, Anne- Marie Lagrange, Mark W. Phillips

Elisabeth C. Matthews et al 2026 The Astrophysical Journal Letters 1002 .

  • Provider: AAS Journals

Caption: Figure 9.

Comparison between CMD positions based on the default MAST spectra (circles) and custom data reductions (stars), which are expected to be more reliable for these faint brown dwarfs. This demonstrates the importance of carefully considering systematics when reducing JWST/MRS data. For reference, Sonora Flame Skimmer models with [Fe/H] = 0.0 (black) and 0.5 (gray) are indicated; the biases in MAST spectra are sufficient that they can significantly impact which model is deemed the best fit to the JWST data.

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