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New constraints on the delivery of cometary water and nitrogen to Earth from the 15N/14N isotopic ratio

New independent constraints on the amount of water delivered to Earth by comets are derived using the 15N/14N isotopic ratio, measured to be roughly twice as high in cometary CN and HCN as in the present Earth. Under reasonable assumptions, we find that no more than a few percent of Earth's water can be attributed to comets, in agreement with the constraints derived from D/H. Our results also suggest that a significant part of Earth's atmospheric nitrogen might come from comets. Since the 15N/14N isotopic ratio is not different in Oort-cloud and Kuiper-belt comets, our estimates apply to the contribution of both types of objects.

preprint2009arXivOpen access
D. HutsemekersJ. ManfroidE. JehinC. Arpigny
astro-ph.EP
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D. HutsemekersJ. ManfroidE. JehinC. Arpigny

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