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Titanium (Ti) is the element with atomic number 22, symbol Ti, The common isotope has a mass number of 48, and mass numbers 46, 47, 49, and 50 are also stable. Titanium is formed through the alpha process in supernovae and within early stars.
Titanium-44 (44Ti), which is radioactive with a half-life of 60 years, is formed in supernovae and its spectral lines can be used to monitor the supernova's progress.
Titanium is detected in M dwarfs, brown dwarfs, and hot Jupiters. The temperature of these bodies can be within the range that allows TiO (titanium monoxide) to persist, and similarly for VO (vanadium oxide) and their absorption lines serve as spectral signatures for the temperature, useful in transmission spectroscopy to determine the temperature of thick extra-solar planet atmospheres at different depths.