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This conference talk explores research findings that small, close-in planets are rarely found orbiting A-type stars, presented by Steven Giacalone from Caltech during the "Planets on the Edge" KITP conference held at UC Santa Barbara in May 2025. The 19-minute presentation contributes to the broader conference goals of understanding Earth-sized planets in inner protoplanetary disks by addressing key questions about their nature, formation mechanisms, governing parameters across different star systems, and why similar planets don't exist in our solar system. The conference brings together experts in exoplanet demographics, protoplanetary disks, planet formation models, and meteoritics to synthesize current knowledge, highlight recent observational results, and foster interdisciplinary collaboration. Coordinated by Myriam Benisty, Eric Gaidos, Neal J. Turner, and Ruth Murray-Clay, this talk is part of a comprehensive effort to advance observations, theory, and computational modeling in this field.
