Spectroscopic Constants and Line Positions for TiO Singlet States

A consistent set of spectroscopic constants for the a¹Δ, d¹Σ⁺, b¹Π, c¹Φ, and f¹Δ states of ⁴⁸Ti¹⁶O has been determined from analysis of the b¹Π-a¹Δ, b¹Π-d¹Σ⁺, c¹Φ-a¹Δ, and f¹Δ-a¹Δ systems. Three Fourier transform emission spectra have been used for the analysis. New bands of the b¹Π-a¹Δ and c¹Φ-a¹Δ systems have been fitted. The first analysis of the c¹Φ-a¹Δ 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.