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The current orbital geometries of exoplanet systems offer a fossilized recordof the systems' dynamical histories. A particularly rich set of dynamicalmechanisms is available to exoplanets residing in multi-star systems, which mayhave their evolution shaped by the gravitational influence of bound stellarcompanions. In this work, we examine the joint distribution of stellarobliquities and orbital orientations for transiting exoplanets residing withinastrometrically resolved binary and triple-star systems. We leverage existingconstraints on stellar obliquities in exoplanet systems, together withastrometric measurements from Gaia DR3, to uncover a set of fully-aligned,"orderly" exoplanet systems that exhibit evidence of both spin-orbit andorbit-orbit alignment. We also find evidence that the observed distribution oforbit-orbit orientations in our sample is more strongly peaked toward alignmentthan an isotropic distribution. Our results may be indicative of efficientviscous dissipation by nodally recessing protoplanetary disks, demonstrating aregime in which stellar companions produce and maintain order in planetarysystems, rather than enhancing misalignments.

The Orbital Geometries and Stellar Obliquities of Exoplanet-Hosting Multi-Star Systems