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Edited by Mark H. Thiemens, University of California San Diego, La Jolla, CA, and approved December 17, 2019 (received for review March 15, 2019)
Article Figures & SI
Figures
- Fig. 1.
Presolar SiC morphology. Scanning electron microscope images (secondary electrons) of representative samples of the two morphological types of presolar SiC grains studied here. Grain L3_01 has a euhedral shape indicating it evaded shattering; (A) before and (B) after pressing into gold and after nanoscale secondary ion mass spectrometry (NanoSIMS) and Sensitive High Resolution Ion Micro Probe (SHRIMP) analysis but before laser extraction of noble gases. Grain L3_20 has a shard-like appearance with fractures (C) before pressing and (D) got fractured further upon pressing into the gold substrate. Images of all grains are provided in SI Appendix.
- Fig. 2.
Comparison of Ne and He exposure ages. Only data for samples for which we obtained He and Ne ages are shown; no upper limits. The data of grains with higher nominal He ages than Ne ages indicates that the recoil correction for He is overestimated because, in the ISM, these grains were part of larger objects (aggregates or larger grains). For those inferred to be part of larger objects, we modeled a recoil correction for object sizes that resulted in equal 3He and 21Ne ages (1:1 line). Here and elsewhere, 1σ error bars do not include systematic errors and are visible if larger than the symbol (see text and SI Appendix).
- Fig. 3.
Presolar Ne exposure ages. Histogram showing the distribution of presolar SiC 21Ne exposure ages. (Inset) Plot of the kernel density estimation (KDE, bandwidth = 36.1; ref. 62) of presolar SiC 21Ne exposure ages. Samples with upper age limits are not included in the histogram but are included in the KDE plot.
- Fig. 4.
Older grains are smaller. Size is given as the geometric mean of the diameter of the grains. Size-corrected data are for aggregates during irradiation in the ISM. Aggregates of >200 µm are shown at 200 µm. Size measurements of all grains are given in SI Appendix.
Data supplements
Supporting Information
Lifetimes of interstellar dust from cosmic ray exposure ages of presolar silicon carbide
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