JWST/MIRI Observations of Amorphous Silicates in Interstellar Comet 3I/ATLAS
How to prepare an accurate paper press kit? Illustrated guide
Cristina A. Thomas, Michael S. P. Kelley, David E. Harker, Martin A. Cordiner, Davide Farnocchia, Dennis Bodewits et al. · arXiv: 2610.37540v1 · Summary page
Why cover this story this week?
Interstellar dust with little sign of heating
Beyond Earth, observations of the interstellar comet 3I/ATLAS offer a glimpse of material formed around another star. A preprint reports that its infrared spectrum, measured with JWST/MIRI after perihelion, contains a broad, smooth silicate emission feature unlike those commonly seen in Solar System comets. Thermal-emission models favor amorphous, pyroxene-dominated silicates, with an upper limit of 5.3% on the crystalline fraction.
The researchers also identify an emission feature consistent with aliphatic carbon–hydrogen-bearing material. The predominantly disordered silicate structure supports the interpretation that the comet’s ingredients experienced little thermal processing, potentially preserving clues to their formation environment. The reconstruction is not unique, however: different combinations of grain size and dust composition can produce similar spectra.
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