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HELIOS–RETRIEVAL: An Open-source, Nested Sampling Atmospheric Retrieval Code; Application to the HR 8799 Exoplanets and Inferred Constraints for Planet Formation

  • Authors: Baptiste Lavie, João M. Mendonça, Christoph Mordasini, Matej Malik, Mickaël Bonnefoy, Brice-Olivier Demory, Maria Oreshenko, Simon L. Grimm, David Ehrenreich, and Kevin Heng

2017 The Astronomical Journal 154 91.

  • Provider: AAS Journals

Caption: Figure 6.

Montage of posterior distributions from performing retrieval on the measured spectrum of HR 8799b and allowing the radius, surface gravity, and mean molecular weights to be uniform or log-uniform priors. The retrieved value of the radius (﹩R\approx 0.5\,{R}_{{\rm{J}}}﹩) is unphysical (see the text for a discussion). The labels “CO,” “CO2,” “CH4,” and “H2O” refer to the mixing ratios of carbon monoxide, carbon dioxide, methane, and water, respectively. R and ﹩{T}_{\mathrm{int}}﹩ are in units of ﹩{R}_{{\rm{J}}}﹩ and K, respectively. The labels “﹩{\kappa }_{0}﹩” and “gravity” are for ﹩\mathrm{log}{\kappa }_{0}﹩ and ﹩\mathrm{log}g﹩ in mks and cgs units, respectively.

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