Spectroscopic Constants and Line Positions for TiO Singlet States

A consistent set of spectroscopic constants for the aΔ, dΣ, bΠ, cΦ, and fΔ states of TiO has been determined from analysis of the bΠ–aΔ, bΠ–dΣ, cΦ–aΔ, and fΔ–aΔ systems. Three Fourier transform emission spectra have been used for the analysis. New bands of the bΠ–aΔ and cΦ–aΔ systems have been fitted. The first analysis of the cΦ–aΔ system using Fourier transform spectra is also provided. Extensive and improved line positions are measured. TiO is prominent in the spectra of oxygen-rich cool stellar objects and may be present in hot-Jupiter exoplanet atmospheres.