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Our interpretation of the observations, with the use of radiative transfer calculations, indicates that both HF and HCl are formed in the inner regions of the envelope close to the AGB star.
Even More Hardcore it's also orbiting a neutron star or black hole.
Visit Stack Exchange Worldbuilding Stack Exchange is a question and answer site for writers/artists using science, geography and culture to construct imaginary worlds and settings. Sign up to join this community I'm curious what it would take to get a planet with so much free fluorine that you can have an atmosphere of predominantly or purely fluorine.
I realize how improbable a planet like this is, so I'm looking for the long set of perhaps contradictory conditions that would lead to a hellscape planet like this.
The abundances relative to H2 derived for HF and HCl, 8 × 10-9 and 10-7 respectively, are substantially lower than those predicted by thermochemical equilibrium, indicating that F and Cl are likely affected by significant depletion onto dust grains, although some chlorine may be in the form of atomic Cl. The low abundance derived for HF in IRC 10216 makes it likely that the fluorine abundance is not enhanced over the solar value by nucleosynthesis in the AGB star, although this conclusion may not be robust because the HF abundance we derive is a lower limit to the elemental abundance of F.
These observations suggest that both HF and HCl should be detectable through low J rotational transitions in other evolved stars.