Prof. Sarah Millholland

Investigating Exoplanet Orbits and Interiors using Data-Driven Dynamics: The galaxy contains an abundance of planets that exhibit physical and orbital properties much different from those represented in the Solar System. Some planets have orbits as small as a few stellar radii and as large as 100 AU; some are as dense as iron while others are puffier than styrofoam; some have highly eccentric and misaligned orbits while others are circular and flat. What generates this diversity? Are there predictable connections between the initial star and protoplanetary disk properties and the final planetary systems we see today?

Professor Millholland's research aims to understand the demographics and diversity of extrasolar planetary systems. She uses orbital dynamics and theory to study patterns in the observed planetary orbital architectures. This refers to properties like the spacings, eccentricities, inclinations, axial tilts, and planetary size relationships. Millholland specializes in investigating how gravitational interactions like tides, resonances, and spin dynamics sculpt observable exoplanet properties. She has also studied planetary interiors and atmospheres and am interested in the cross-section between orbital dynamics and planetary physical properties. Millholland tends to work closely with data and enjoy following observational mysteries when they arise.