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The analysis of exoplanetary atmospheres often relies upon the observation oftransit or eclipse events. While very powerful, these snapshots provide mainly1-dimensional information on the planet structure and do not easily allowprecise latitude-longitude characterisations. The phase curve technique, whichconsists of measuring the planet emission throughout its entire orbit, canbreak this limitation and provide useful 2-dimensional thermal and chemicalconstraints on the atmosphere. As of today however, computing performances havelimited our ability to perform unified retrieval studies on the full set ofobserved spectra from phase curve observations at the same time. Here, wepresent a new phase curve model that enables fast, unified retrievalcapabilities. We apply our technique to the combined phase curve data from theHubble and Spitzer space telescopes of the hot-Jupiter WASP-43 b. We testeddifferent scenarios and discussed the dependence of our solution to differentassumptions in the model. Our more comprehensive approach suggests thatmultiple interpretation of this dataset are possible but our more complex modelis consistent with the presence of thermal inversions and a metal richatmosphere, contrasting with previous data analyses, although this likelydepends on the Spitzer data reduction. The detailed constraints extracted heredemonstrate the importance of developing and understanding advanced phase curvetechniques, which we believe will unlock access to a richer picture ofexoplanet atmospheres.

An exploration of model degeneracies with a unified phase curve retrieval analysis: The light and dark sides of WASP-43 b