Science Advances

Supplementary Materials

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  • Supplementary Text
  • Fig. S1. Itokawa particles, overview of LAR 12036 ordinary chondrite, and sample holder for NanoSIMS measurements.
  • Fig. S2. Reported oxygen isotopic compositions of Itokawa minerals modified after 14.
  • Fig. S3. SIMS craters on Itokawa particles and ion intensities during their NanoSIMS measurements.
  • Fig. S4. Representative reflected-light images of the analyzed spots after Cameca IMS 6f analyses and the H counting rates during the analyses.
  • Fig. S5. Calibrations of water contents and hydrogen isotope compositions using terrestrial standards.
  • Fig. S6. The onion shell model of parent body used for expected water loss calculation.
  • Table S1. Water concentration and D/H ratios of reference standards and Itokawa grains.
  • Table S2. D/H ratios of reference standards and adopted pyroxene from LAR 12036 ordinary chondrite.
  • Table S3. Simulated water loss caused by thermal metamorphism and impact events using the thermal diffusion model.
  • Table S4. Estimated average water loss of the assumed 25-km-radius parent body caused by thermal metamorphism and impact events.
  • References (4698)

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