{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1360021390750700288.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.3847/psj/acea62"}},{"identifier":{"@type":"URI","@value":"https://iopscience.iop.org/article/10.3847/PSJ/acea62"}},{"identifier":{"@type":"URI","@value":"https://iopscience.iop.org/article/10.3847/PSJ/acea62/pdf"}}],"resourceType":"学術雑誌論文(journal article)","dc:title":[{"@value":"The Oxygen Isotopic Composition of Samples Returned from Asteroid Ryugu with Implications for the Nature of the Parent Planetesimal"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:title>Abstract</jats:title>\n               <jats:p>We present oxygen isotopic analyses of fragments of the near-Earth C<jats:sub>b</jats:sub>-type asteroid Ryugu returned by the Hayabusa2 spacecraft that reinforce the close correspondence between Ryugu and CI chondrites. Small differences between Ryugu samples and CI chondrites in <jats:inline-formula>\n                     <jats:tex-math>\n\n</jats:tex-math>\n                     <mml:math xmlns:mml=\"http://www.w3.org/1998/Math/MathML\" overflow=\"scroll\">\n                        <mml:msup>\n                           <mml:mrow>\n                              <mml:mi mathvariant=\"normal\">Δ</mml:mi>\n                           </mml:mrow>\n                           <mml:mrow>\n                              <mml:mo accent=\"true\">′</mml:mo>\n                              <mml:mn>17</mml:mn>\n                           </mml:mrow>\n                        </mml:msup>\n                        <mml:mi mathvariant=\"normal\">O</mml:mi>\n                     </mml:math>\n                     <jats:inline-graphic xmlns:xlink=\"http://www.w3.org/1999/xlink\" xlink:href=\"psjacea62ieqn1.gif\" xlink:type=\"simple\"/>\n                  </jats:inline-formula> can be explained at least in part by contamination of the latter by terrestrial water. The discovery that a randomly sampled C-complex asteroid is composed of CI-chondrite-like rock, combined with thermal models for formation prior to significant decay of the short-lived radioisotope <jats:sup>26</jats:sup>Al, suggests that if lithified at the time of alteration, the parent body was small (≪50 km radius). If the parent planetesimal was large (>50 km in radius), it was likely composed of high-permeability, poorly lithified sediment rather than consolidated rock.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1380021390750700327","@type":"Researcher","foaf:name":[{"@value":"Haolan Tang"}]},{"@id":"https://cir.nii.ac.jp/crid/1380021390750700181","@type":"Researcher","foaf:name":[{"@value":"Edward D. 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