Thomas Allan Aaron Sigut (b. 1966) is a Canadian astronomer who completed his PhD at the University of Toronto on infrared Rydberg transitions in B stars in 1995. He is known for his research on circumstellar disks around hot stars, classical Be stars, Herbig Ae/Be stars and non-LTE radiative transfer as applied to precise stellar abundance determinations.
Reference: WGSBN Bulletin, 2023-02-27, Volume 3, Number 3, page 15