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A race against the clock: Constraining the timing of cometary bombardment relative to Earth's growth by Joiret, Sarah; Raymond, Sean N.; Avice, Guillaume; Clement, Matthew S.; Deienno, Rogerio; Nesvorný, David is a scholarly article available to read on EtoBox.

What is A race against the clock: Constraining the timing of cometary bombardment relative to Earth's growth about?

Comets are considered a potential source of inner solar system volatiles, but the timing of this delivery relative to that of Earth's accretion is still poorly understood. Measurements of xenon isotopes in comet 67P/Churyumov-Gerasimenko revealed that comets partly contributed to the Earth's atmosphere. However, there is no conclusive evidence of a significant cometary component in the Earth's mantle. These geochemical constraints would favour a contribution of comets mainly occurring after the last stages of Earth's formation. Here, we evaluate whether dynamical simulations satisfy these constraints in the context of an Early Instability model. We perform dynamical simulations of the solar system, calculate the probability of collision between comets and Earth analogs component embryos through time and estimate the total cometary mass accreted in Earth analogs as a function of time. While our results are in excellent agreement with geochemical constraints, we also demonstrate that the contribution of comets on Earth might have been delayed with respect to the timing of the instability, due to a stochastic component of the bombardment. More importantly, we show that it is possible

Author

Joiret, Sarah; Raymond, Sean N.; Avice, Guillaume; Clement, Matthew S.; Deienno, Rogerio; Nesvorný, David

Published

2023

Language

EN