TESS & KPF: TOI-2364 light & radial velocity curves

We used new Rossiter-McLaughlin observations gathered with the Keck Planet Finder to measure the sky-projected obliquity {lambda}=7{deg}+10{deg}-11{deg}. Combined with a stellar rotation period of 23.47+/-0.29days measured with photometry from the Tierras Observatory, this yields a stellar inclination of 90{deg}+/-13{deg} and a true obliquity {psi}=15:6+7:7-7:3, indicating that the planet's orbit is well aligned with the rotation axis of its host star.

The determination of {psi} is important for investigating a potential bimodality in the orbits of short-period sub-Saturns around cool stars, which tend to be either aligned with or perpendicular to their host stars' spin axes.