Panchromatic View of the Frigid Jovian Exoplanet COCONUTS-2 b
Matthieu Ravet, Micka\"el Bonnefoy, Ga\"el Chauvin, Zhoujian Zhang, Jacqueline K. Faherty, Ma\"el Voyer, Mark W. Phillips, Pascal Tremblin, Rocio Kiman, Jessica Copeland, James J. Mang, Caroline V. Morley, Helena K\"uhnle, Benjamin Charnay, Sam de Regt, Paul Molli\`ere

TL;DR
This study combines multi-instrument spectra from 1 to 15 micrometers to analyze the atmosphere of the Jovian exoplanet COCONUTS-2 b, revealing molecular features and constraining its physical properties.
Contribution
It provides a comprehensive atmospheric characterization of COCONUTS-2 b using combined spectral data and advanced modeling, including Gaussian Processes for noise treatment.
Findings
Detected H2O, CH4, and NH3 features in the spectrum.
Constrained atmospheric parameters: T_eff ≈ 496 K, log(g) ≈ 4.30.
Estimated mass of the planet as approximately 7.3 Jupiter masses.
Abstract
We use a high signal-to-noise MIRI-LRS spectrum (5.45 - 11 m, R ) of COCONUTS-2~b revealing prominent molecular features of HO, CH and NH. This dataset is combined with spectra from Gemini/FLAMINGOS-2 and JWST/NIRSpec (G395H), as well as photometry from WISE and Spitzer, resulting in almost continuous wavelength coverage from 1 to 15 m. We analyze the data using five grids of self-consistent atmospheric models, spanning a wide range of T, log(g), and [M/H]. We also investigate the use of Gaussian Processes to account for correlated noise either caused by the spectrograph or by systematic departures of models in the inversion framework. All models manage to fit the overall combined observations but predict fainter flux in Y- and N-bands. Classical model comparison suggests that the ATMO2020++ synthetic specra (with and without PH)…
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