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The Nancy Grace Roman Space Telescope (Roman) is NASA's next astrophysicsflagship mission, expected to launch in late 2026. As one of Roman's corecommunity science surveys, the Galactic Bulge Time Domain Survey (GBTDS) willcollect photometric and astrometric data for over 100 million stars in theGalactic bulge to search for microlensing planets. To assess the potential withwhich Roman can detect exoplanets via transit, we developed and conductedpixel-level simulations of transiting planets in the GBTDS. From thesesimulations, we predict that Roman will find between $\sim$60,000 and$\sim$200,000 transiting planets, over an order of magnitude more planets thanare currently known. While the majority of these planets will be giants($R_p>4R_\oplus$) on close-in orbits ($a<0.3$ au), the yield also includesbetween $\sim$7,000 and $\sim$12,000 small planets ($R_p<4 R_\oplus$). Theyield for small planets depends sensitively on the observing cadence and seasonduration, with variations on the order of $\sim$10-20% for modest changes ineither parameter, but is generally insensitive to the trade between surveyedarea and cadence given constant slew/settle times. These predictions dependsensitively on the Milky Way's metallicity distribution function, highlightingan opportunity to significantly advance our understanding of exoplanetdemographics, particularly across stellar populations and Galacticenvironments.

Transiting Exoplanet Yields for the Roman Galactic Bulge Time Domain Survey Predicted from Pixel-Level Simulations