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JWST Unveils a High Mean Molecular Weight Atmosphere for Mini-Neptune TOI-1130 b: Evidence for Formation Beyond the Water Ice Line

  • Authors: Saugata Barat, Tyler Fairnington, Shelby Courreges, Chelsea Huang, Andrew Vanderburg, Caroline V. Morley, Judith Korth, Hannu Parviainen, Alexis Brandeker, George Zhou, Thomas M. Evans-Soma, Lizhou Sha, Douglas N. C. Lin, Duncan Wright, Ava Morrissey, Emma Nabbie, Karen A. Collins, Phil Evans, Tristan Guillot, Keith Horne, Don J. Radford, Richard P. Schwarz, Avi Shporer, Gregorg Srdoc, Olga Suarez

Saugata Barat et al 2026 The Astrophysical Journal Letters 1002 .

  • Provider: AAS Journals

Caption: Figure 5.

Transmission spectrum of TOI-1130 b with the best-fit free chemistry, equilibrium chemistry, and grid models overplotted (left), and a comparison between the retrieved abundances from the three model fits for TOI-1130 b (right). The points shown in the right panel are the best-fit mass fractions from the free retrieval. The H2O and CO2 posterior distributions show lower limits, where as the other molecules show Gaussian distributions. Therefore the H2O and CO2 data points are shown with upper arrows. The solid lines show chemical abundance profiles from equilibrium chemistry and the dashed lines show the chemical profiles from the self-consistent forward model grid.

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