Science Advances

This PDF file includes:

• 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 (46–98)

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