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The Interstellar Comet's Tail Carried Unusual Nitrogen
Spectra of 3I/ATLAS detected five ions and set a lower limit on nitrogen-to-carbon monoxide above most Solar System comet values.
Summary
Spectra of 3I/ATLAS detected five ions and set a lower limit on nitrogen-to-carbon monoxide above most Solar System comet values.
Post-perihelion observations with the William Herschel Telescope's WEAVE large integral-field unit detected N2+, CO+, CO2+, H2O+ and CH+ in the anti-solar plasma tail of 3I/ATLAS. Using fluorescence factors, the team derived a lower limit of 0.023 plus or minus 0.001 for N2/CO, describing the interstellar comet as nitrogen-rich relative to Solar System comets and consistent with cold formation conditions. The authors warn that ratios among the other ions cannot directly determine neutral abundances; a decrease in CH+ with distance was only marginal.
Why it matters
Spectra of 3I/ATLAS detected five ions and set a lower limit on nitrogen-to-carbon monoxide above most Solar System comet values.
Limits and context
- The authors warn that ratios among the other ions cannot directly determine neutral abundances; a decrease in CH+ with distance was only marginal.
Key claims
Spectra of 3I/ATLAS detected five ions and set a lower limit on nitrogen-to-carbon monoxide above most Solar System comet values.
Qualification: The authors warn that ratios among the other ions cannot directly determine neutral abundances; a decrease in CH+ with distance was only marginal.
Evidence: source-2026-09-08-016
Sources
- arXiv preprint 2609.05393arXiv · primary research
Corrections
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