Steven Villanueva

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About

Steven Villanueva is an observational astronomer specializing in exoplanet detection and characterization, with a focus on developing automated, robotic telescope systems for high-cadence time-domain astronomy. His major contributions center on the design, construction, and operation of dedicated monitoring facilities that enable precise follow-up observations of transiting exoplanets and transient events. Villanueva led the DEMONEX (DEdicated MONitor of EXotransits) project, a 20-inch robotic telescope that successfully monitored bright stars hosting transiting exoplanets, exemplified by his work on seven transits of XO-4b (11 citations). He further advanced the field with DEMONEXT (DEdicated MONitor of EXotransits and Transients), a low-cost, automated 20-inch telescope jointly funded by The Ohio State University and Vanderbilt University (8 citations). This system, featuring a PlaneWave CDK20 f/6.8 Corrected Dall-Kirkham Astrograph, expanded capabilities to include both exoplanetary transit follow-up and transient event monitoring. Villanueva’s work demonstrates how cost-effective robotic telescopes can significantly contribute to exoplanet science, improving orbital and physical parameter constraints for known systems while enabling discovery of new planets. His engineering-driven approach to astronomy has made high-quality time-domain observations more accessible.