The Astrophysical Journal
Recent limitations in the TiO line list used in cross-correlation detection schemes have made the detection and quantification of TiO in exoplanetary atmospheres challenging. The quality of the line list appears to degrade at wavelengths shorter than 630 nm. The C3Δ-X3Δ electronic transition has strong rovibronic bands near 500 nm. In an effort to improve the line list, a spectrum of TiO in a furnace at 1950 K is analyzed, and the assigned lines of the C3Δ-X3Δ transition are fit with the N2 Hamiltonian in the molecular spectrum fitting software, PGOPHER. Several newly determined molecular constants are reported and the average error in fitting the line positions is 0.017 cm−1 or ∼1 ppm relative error. The new line positions are expected to resolve any problems with cross-correlation templates near 500 nm.
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Original Publication Citation
Hodges, J. N., & Bernath, P. F. (2018). Fourier transform spectroscopy of the C³Δ-X³Δ transition of TiO in support of exoplanet spectroscopy. The Astrophysical Journal, 863(1), 1-4, Article 36. https://doi.org/10.3847/1538-4357/aacf07
Hodges, James N. and Bernath, Peter, "Fourier Transform Spectroscopy of the C³Δ-X³Δ Transition of TiO in Support of Exoplanet Spectroscopy" (2018). Chemistry & Biochemistry Faculty Publications. 270.