| 研究実績の概要 |
I have explored the geochemical processes that shaped organic distributions on the parent icy planetesimals of carbonaceous chondrite. In the past year, I further extended the model to the parent body of carbonaceous asteroid Ryugu. These research results have resulted in one published paper (Nature Communications, 2022) and one manuscript currently under review (Li et al., under review). Our major finding is that aqueous alteration can lead to complex behavior of organics on its parent body, including both synthetic and breakdown mechanisms. If the parent planetesimal is water/rock differentiated, the redox gradients between the water-rich mantle and water-depleted core can drive the decomposition of dicarboxylic amino acids to n-w-amino acids even at low temperature (e.g., 25 oC).
|
