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The Evolution in Coma Molecular Composition of Comet C/2017 K2 (PanSTARRS) across the H2O Sublimation Zone: ALMA Imaging of a H2O-dominated Coma

  • Authors: Nathan X. Roth, Stefanie N. Milam, Martin A. Cordiner, Anthony J. Remijan, Dominique Bockelée-Morvan, Nicolas Biver, Jérémie Boissier, Steven B. Charnley, Charles E. Woodward, Lillian X. Hart, Timothy N. Proudkii

Nathan X. Roth et al 2026 The Planetary Science Journal 7 .

  • Provider: AAS Journals

Caption: Figure 2.

(a–d) Spectrally integrated flux map for CH3OH and H2CO in K2, with traces and labels as in Figure 1. Contours are in 10σ increments for CH3OH and 5σ increments for H2CO (JKa,Kc = 51,5–41,4). Contours are 3σ and 5σ for H2CO (JKa,Kc = 50,5–40,4). In contrast to the other species, H2CO showed asymmetric, clumpy, and spatially extended emission.

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