  We present our current update on the gas-phase chemical reactions and
spectral lines of TiO in the spectral synthesis code Cloudy. For this purpose,
we have added 229 Ti-related reactions in the chemical network. In addition, we
consider 230 fine-structure energy levels, the corresponding 223 radiative
transitions, and 444 collisional transitions with ortho and para H$_2$ and
predict 66 TiO lines. We perform spectroscopic simulations of TiO emission from
the circumstellar region of the oxygen-rich red supergiant VY Canis Majoris to
validate our update. Our model reproduces the observed TiO column density. This
update is helpful in modeling dust-free astrophysical environments where Ti is
in the gas phase and TiO can form.
