The mixture of gasses measured in exoplanet K2-18 b suggests it may have a global ocean beneath a hydrogen-rich atmosphere—and astronomers even spotted a tantalizing, though unconfirmed, sign of life.
, revealing that they are probably bare rock without protective atmospheres of CO2, making life unlikely. The findings suggest rocky planets such as these, which orbit a type of cool dwarf star known for giving off flares, may not be suitable environments for living organisms.
“Folks have already shown that the retrieved abundances from JWST can be very pipeline dependent,” says Sarah Hörst, a planetary scientist at John Hopkins University who specializes in atmospheric chemistry and was not part of the new study. “Calculations required to make such a claim are highly sensitive to the amount of various molecules in the atmosphere.”
But there is another clue in the Webb data—the possible presence of the molecule dimethyl sulphide. You find DMS in Earth’s atmosphere, produced by swarms of phytoplankton in the oceans. It’s also the compound that makes a German-style lager smell so pungent.
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