JWST Detects 5.113-Micrometer Mystery Band on Titan and Pluto
Updated
Updated · spacedaily.com · Aug 7
JWST Detects 5.113-Micrometer Mystery Band on Titan and Pluto
1 articles · Updated · spacedaily.com · Aug 7
Summary
Two JWST instruments found the same narrow absorption on Titan at 5.1125-5.1126 micrometers, with depths of about 5.8% and 7.5%, and MIRI saw a matching 5.1128-micrometer dip on Pluto at roughly 4.5%.
Titan data point to a surface origin: the 5.11-micrometer band weakened by roughly half toward the limb while familiar atmospheric lines stayed similar, making an atmospheric explanation less likely.
Published laboratory spectra did not match the feature, even after comparisons with expected ices, hydrocarbons, nitriles, tholins, benzene, ketene and propadiene-related candidates.
Pluto's band is much broader—about 0.069 micrometers versus 0.024 on Titan—suggesting the same carrier could behave differently under colder, more irradiated surface conditions rather than proving identical chemistry.
The accepted Astronomy & Astrophysics study frames the result as a targeted identification problem for future Webb mapping, low-temperature lab work and eventually Dragonfly, which reaches Titan in late 2034.