Lack of other molecules in CO-rich debris discs: is it primordial or secondary gas?

Grigorii V. Smirnov-Pinchukov, Attila Moór, Dmitry A. Semenov +5

The nature of the gas in CO-rich debris discs remains poorly understood, as it could either be a remnant from the earlier Class II phase or of secondary origin, driven by the destr…