As we were deciding on carbon, hydrogen, oxygen, and nitrogen (CHON) in space and on Earth (respectively): here's ISO-Chamaeleonis-I 147. Lots of the former two elements. Less of the latter two.
It seems that the ultracool stars, like GJ 12 and TRAPPIST-1, don't come with oxygen. So what's had are the organic classics: acetylene (first seen, from Earth), ethylene, benzene, even that classic of Titan ethane. These are seen in a 300 K cloud. So pretty much the weather here this past week but without the ozone.
Such planets might not be enriched in these compounds if the reason for all these hydrocarbon gasses is that the star has blazed them off the rocks. But, presumably, the gas'll form comets (at low distances from such cold stars) which might end up crashing back into the planets.
The research doesn't speculate what this sort of oxygen-depleted planet might look like except that it is certainly not Earthly. Soot planet again? Gasoline and ethanol seas?
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