JWST mid-IR observations of interstellar comet 3I/ATLAS yield the first direct methane detection and confirm strongly enhanced CO2:H2O mixing ratios relative to solar system comets.
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JWST spatial-spectral maps of 3I/ATLAS reveal CO as the primary volatile with H2O and CO2 abundances of 40.5% and 41.6% relative to CO, anisotropic distributions for apolar molecules, and a flat H2O OPR of 2.7.
Post-perihelion UVES spectra of interstellar comet 3I/ATLAS reveal elevated NiI and FeI production explained by direct sublimation of Ni(CO)4 and Fe(CO)5 from subsurface layers, with a transient heat source accounting for the pre-perihelion Ni excess.
Post-perihelion optical spectroscopy of 3I/ATLAS reveals less C2 depletion than pre-perihelion, perihelion asymmetry in CN and metal production, metal release tied to CO rather than H2O, and residual [O I] emission indicating additional oxygen parents.
A Haser model tracking the fading of icy grain albedo by sublimation explains the exponential surface brightness profiles and photometry of comet 3I/ATLAS, with total ice scattering cross-section peaking at 3-4 au.
citing papers explorer
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The Volatile Inventory of 3I/ATLAS as seen with JWST/MIRI
JWST mid-IR observations of interstellar comet 3I/ATLAS yield the first direct methane detection and confirm strongly enhanced CO2:H2O mixing ratios relative to solar system comets.
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Coma Physics of an Interstellar Object: JWST Spatial-Spectral Mapping of 3I/ATLAS
JWST spatial-spectral maps of 3I/ATLAS reveal CO as the primary volatile with H2O and CO2 abundances of 40.5% and 41.6% relative to CO, anisotropic distributions for apolar molecules, and a flat H2O OPR of 2.7.
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Origin and evolution of NiI and FeI in the coma of the interstellar comet 3I/ATLAS throughout its trajectory
Post-perihelion UVES spectra of interstellar comet 3I/ATLAS reveal elevated NiI and FeI production explained by direct sublimation of Ni(CO)4 and Fe(CO)5 from subsurface layers, with a transient heat source accounting for the pre-perihelion Ni excess.
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Post-perihelion Coma Composition of the Interstellar Comet 3I/ATLAS from Optical Spectroscopy
Post-perihelion optical spectroscopy of 3I/ATLAS reveals less C2 depletion than pre-perihelion, perihelion asymmetry in CN and metal production, metal release tied to CO rather than H2O, and residual [O I] emission indicating additional oxygen parents.
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A Physical Model for the Ice Coma of the Interstellar, Hyperactive Comet 3I/ATLAS
A Haser model tracking the fading of icy grain albedo by sublimation explains the exponential surface brightness profiles and photometry of comet 3I/ATLAS, with total ice scattering cross-section peaking at 3-4 au.