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Detecting Earth-like exoplanets in direct images of nearby Sun-like systemsbrings a unique set of challenges that must be addressed in the early phases ofdesigning a space-based direct imaging mission. In particular, these systemsmay contain exozodiacal dust, which is expected to be the dominant source ofastrophysical noise. Previous work has shown that it may be feasible tosubtract smooth, symmetric dust from observations; however, we do not expectexozodiacal dust to be perfectly smooth. Exozodiacal dust can be trapped intomean motion resonances with planetary bodies, producing large-scale structuresthat orbit in lock with the planet. This dust can obscure the planet,complicate noise estimation, or be mistaken for a planetary body. Our abilityto subtract these structures from high-contrast images of Earth-like exoplanetsis not well understood. In this work, we investigate exozodi mitigation forEarth--Sun-like systems with significant mean motion resonant disk structures.We find that applying a simple high-pass filter allows us to remove structuredexozodi to the Poisson noise limit for systems with inclinations $< 60^\circ$and up to 100 zodis. However, subtracting exozodiacal disk structures fromedge-on systems may be challenging, except for cases with densities $<5$ zodis.For systems with three times the dust of the Solar System, which is the medianof the best fit to survey data in the habitable zones of nearby Sun-like stars,this method shows promising results for mitigating exozodiacal dust in futureHWO observations, even if the dust exhibits significant mean-motion resonancestructure.

Mitigating Worst-Case Exozodiacal Dust Structure in High-contrast Images of Earth-like Exoplanets