Ontology type: schema:ScholarlyArticle Open Access: True
2021-05-18
AUTHORSMinami Yasui, Taku Tazawa, Ryohei Hashimoto, Masahiko Arakawa, Kazunori Ogawa
ABSTRACTChemical reactions on asteroid parent bodies, such as aqueous alteration and the formation of organic solids, require a heat source. Radioactive decay in the interiors of these bodies is generally considered the most important heat source, but impact-generated heating is also likely to play a role. Here we present high-velocity impact cratering experiments using thermocouples embedded in the target material to directly measure the spatial and temporal evolution of temperature throughout each impact experiment. We find that the maximum temperature below the crater floor scales with the distance from the impact point, while the duration of temperature rise is scaled by the thermal diffusion time. We use numerical modelling to suggest that, at distances within 2 astronomical units, impacts producing craters of >20 km radius can facilitate aqueous alteration in the material below the crater, while those which produce craters of 1 km radius can support organic solid formation. More... »
PAGES95
http://scigraph.springernature.com/pub.10.1038/s43247-021-00159-x
DOIhttp://dx.doi.org/10.1038/s43247-021-00159-x
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