FIRST-PL: on-sky retrieval of Humu’s (Altair) spin axis using a photonic lantern on Subaru Telescope
The FIRST-PL instrument on the Subaru Telescope enables a new observational capability: measuring stellar spin orientations for indirect constraints on exoplanet orbital geometry. We describe the instrument and demonstrate data reduction techniques to measure the spin orientation of Humu (Altair), whose apparent size i...