  Recent detections of thermal inversions in the dayside atmospheres of some
hot Jupiters are motivating new avenues to understand the interplay between
their temperature structures and other atmospheric conditions. In particular,
TiO has long been proposed to cause thermal inversions in hot Jupiters,
depending on other factors such as stellar irradiation, C/O, and vertical
mixing. TiO also has spectral features in the optical and near-infrared that
have been detected. However, interpretations of TiO signatures rely on the
accuracy of TiO opacity used in the models. The recently reported Toto TiO line
list provides a new opportunity to investigate these dependencies, which is the
goal of the present work. First, we investigate how the Toto line list affects
observable transmission and emission spectra of hot Jupiters at low and high
resolution. The improvement in the Toto line list compared to a previous line
list results in observable differences in the model spectra, particularly in
the optical at high resolution. Secondly, we explore the interplay between
temperature structure, irradiation and composition with TiO as the primary
source of optical opacity, using 1D self-consistent atmospheric models. Among
other trends, we find that the propensity for thermal inversions due to TiO
peaks at C/O$\sim$0.9, consistent with recent studies. Using these models, we
further assess metrics to quantify thermal inversions due to TiO, compared to
frequently-used Spitzer photometry, over a range in C/O, irradiation,
metallicity, gravity and stellar type.
