Bayesian fitting of NICER comet X-ray data identifies three spectral families and shows carbon-derived freeze-in temperatures lower than those from nitrogen and oxygen lines, with short-term variability attributed to solar-wind charge-state changes.
Discovery of carbon monoxide in distant comet c/2017 k2 (panstarrs).The Astrophysical Journal Letters, 914(1):L17
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Bayesian Modeling of NICER Cometary X-ray Spectra: A Legacy Survey of Solar-Wind Charge Exchange
Bayesian fitting of NICER comet X-ray data identifies three spectral families and shows carbon-derived freeze-in temperatures lower than those from nitrogen and oxygen lines, with short-term variability attributed to solar-wind charge-state changes.