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Deducing the cloud cover and its temporal evolution from the observedplanetary spectra and phase curves can give us major insight into theatmospheric dynamics. In this paper, we present Aeolus, a Markov-Chain MonteCarlo code that maps the structure of brown dwarf and other ultracoolatmospheres. We validated Aeolus on a set of unique Jupiter Hubble SpaceTelescope (HST) light curves. Aeolus accurately retrieves the properties of themajor features of the jovian atmosphere such as the Great Red Spot and a major5um hot spot. Aeolus is the first mapping code validated on actual observationsof a giant planet over a full rotational period. For this study, we appliedAeolus to J and H-bands HST light curves of 2MASSJ21392676+0220226 and2MASSJ0136565+093347. Aeolus retrieves three spots at the top-of-the-atmosphere(per observational wavelength) of these two brown dwarfs, with a surfacecoverage of 21+-3% and 20.3+-1.5% respectively. The Jupiter HST light curveswill be publicly available via ADS/VIZIR.

Aeolus: A Markov--Chain Monte Carlo code for mapping ultracool atmospheres. An application on Jupiter and brown dwarf HST light curves