Bayesian analysis of Enceladus’s plume data to assess methanogenesis

نویسندگان

چکیده

Observations from NASA’s Cassini spacecraft established that Saturn’s moon Enceladus has an internal liquid ocean. Analysis of a plume ocean material ejected into space suggests alkaline hydrothermal vents are present on Enceladus’s seafloor. On Earth, such deep-sea harbour microbial ecosystems rich in methanogenic archaea. Here we use Bayesian statistical approach to quantify the probability methanogenesis (biotic methane production) might explain escape rates molecular hydrogen and plume, as measured by instruments. We find observed (1) cannot be explained solely abiotic alteration rocky core serpentinization; (2) compatible with hypothesis habitable conditions for methanogens; (3) score highest likelihood under methanogenesis, assuming life emerging is high enough. If low, measurements consistent yet uninhabited point unknown sources (for example, primordial methane) awaiting discovery future missions. What origin detected plumes? A problem shows serpentinization rocks abundance itself, biotic production gets likelihood—provided at high.

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ژورنال

عنوان ژورنال: Nature Astronomy

سال: 2021

ISSN: ['2397-3366']

DOI: https://doi.org/10.1038/s41550-021-01372-6