Terrestrial planet formation from lost inner solar system material
Abstract
Two fundamentally different processes of rocky planet formation exist, but it is unclear which one built the terrestrial planets of the solar system. Either they formed by collisions among planetary embryos from the inner solar system, or by accreting sunward-drifting millimeter-sized 'pebbles' from the outer solar system. We show that the isotopic compositions of Earth and Mars are governed by two-component mixing among inner solar system materials, including material from the innermost disk unsampled by meteorites, whereas the contribution of outer solar system material is limited to a few percent by mass. This refutes a pebble accretion origin of the terrestrial planets, but is consistent with collisional growth from inner solar system embryos. The low fraction of outer solar system material in Earth and Mars indicates the presence of a persistent dust-drift barrier in the disk, highlighting the specific pathway of rocky planet formation in the solar system.
Keywords
Cite
@article{arxiv.2201.08092,
title = {Terrestrial planet formation from lost inner solar system material},
author = {Christoph Burkhardt and Fridolin Spitzer and Alessandro Morbidelli and Gerrit Budde and Jan H. Render and Thomas S. Kruijer and Thorsten Kleine},
journal= {arXiv preprint arXiv:2201.08092},
year = {2022}
}
Comments
combined main test + supplement of published article