AU Microscopii is among the most heavily spotted stars while hosting one of the best targets for atmospheric characterization of sub-Neptune worlds given the temperature (3700 K), proximity (9.7 pc), and age (20-25 Myr) of the system. HST/WFC3 transmission spectrum observations of its inner-most planet, AU Mic b, are expected to exhibit strong atmospheric absorption but these signals are obscured by various forms of stellar activity. In this talk I will discuss a method of de-contaminating the transmission spectrum which uses chromatic information in the spectroscopic light curves to characterize the stellar surface alongside the planetary atmosphere. Speaker: William Waalkes
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