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The spectra reveal a broad 3\u00a0\n                    <jats:italic>\u03bc<\/jats:italic>\n                    m absorption band together with H\n                    <jats:sub>2<\/jats:sub>\n                    O, CO\n                    <jats:sub>2<\/jats:sub>\n                    , and CO gas emission. Unlike previously reported water-ice-rich solar system comae, the strong 3\u00a0\n                    <jats:italic>\u03bc<\/jats:italic>\n                    m absorption is accompanied by weak or absent 1.5 and 2.0\u00a0\n                    <jats:italic>\u03bc<\/jats:italic>\n                    m water-ice bands. Spectral modeling indicates that the observations are best reproduced by submicron- to micron-sized water-ice-bearing aggregates containing refractory material. Compared with Epoch\u00a01, the Epoch\u00a03 spectrum favors the presence of a second population of larger, micron-sized, ice-rich aggregates and exhibits a subtle Fresnel-like structure near 3.1\u00a0\n                    <jats:italic>\u03bc<\/jats:italic>\n                    m, consistent with crystalline water ice. The observations can be explained by either crystalline water ice at both epochs, with the spectral evolution arising primarily from changes in grain size and refractory mixing, or an evolution from an amorphous-like to crystalline state. The spectral properties of 3I bridge those of water-ice-bearing solar system comae and several spectral classes of mid-sized trans-Neptunian objects. These similarities suggest that the icy building blocks of planetesimals formed in different protoplanetary disks may share a common continuum in the physical state of water ice, ranging from pure ice grains to water-ice-bearing aggregates with varying refractory content at submicron-to-micron scales, with the grains observed in 3I lying toward the refractory-rich end of this continuum.\n                  <\/jats:p>","DOI":"10.3847\/2041-8213\/aea60d","type":"journal-article","created":{"date-parts":[[2026,10,26]],"date-time":"2026-10-26T09:00:32Z","timestamp":1793005232000},"page":"L11","update-policy":"https:\/\/doi.org\/10.1088\/crossmark-policy","source":"Crossref","is-referenced-by-count":0,"title":["JWST Reveals Refractory-rich Water Ice in Interstellar Comet 3I\/ATLAS: Evidence for a Continuum of Grain Properties across Protoplanetary Disks"],"prefix":"10.3847","volume":"1011","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-8541-8550","authenticated-orcid":true,"given":"Silvia","family":"Protopapa","sequence":"first","affiliation":[{"name":"Southwest Research Institute"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"ORCID":"https:\/\/orcid.org\/0000-0002-6702-7676","authenticated-orcid":true,"given":"Michael S. 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