Jingwen Zhang

From the calendar

Stellar and substellar companions are thought to play a crucialrole in shaping the formation and migration of the inner planets. However, thethree-dimensional orbital architecture of these systems, including the mutualinclination between inner planets and outer companions, are largely unexplored.In this talk, I will describe our survey of planetary and stellar companions totransiting planet hosts with significant Hipparcos-Gaia astrometric acceleration. First, I will highlight discoveries of distant giantplanets whose three-dimensional orbits are well constrained using RVs andastrometry. These systems offer key insights into how outer giants can drivethe inward migration of hot Jupiters or perturb the orbits of inner smallplanets. Second, I will share results on stellar companions, where we measuredthe mutual inclinations between planetary orbits and binary companions. Ouranalysis shows strong evidence favoring a two-population model: one group with nearlyaligned planet-binary orbits and another with a broader mutual inclinationdistribution. This observed dichotomy likely reflects distinct dynamicalhistories shaping the planet formation in binary systems.