Infall And Disk Processes – The Message From Meteorites

How do planetary systems, in general, and our own Solar System (SS), in particular, form? In conjunction, Astronomy and Isotope Cosmochemistry provide us with powerful tools to answer this age-old question.

In this contribution, we review recent advances in our understanding of circumstellar disk evolution, including infall and disk processes, as explored through astrophysical models and nucleosynthetic isotope anomalies of SS materials.

Astronomically, filamentary structures and anisotropy are observed across the dynamic range of star formation and disk substructures are found to be ubiquitous, highlighting how star- and planet-forming environments are far more complex and dynamic than previously thought. Isotopically, two decades of investigation of nucleosynthetic anomalies in bulk meteorites and refractory inclusions have produced a rich dataset, revealing the existence of pervasive heterogeneity in the early SS, both at the large- (i.e., NC-CC dichotomy) and fine-scale (i.e., trends within the NC group).

Using an updated data compilation, we review the systematics and emerging structures of these anomalies as a function of their nucleosynthetic origin. We present the two main families of models – inheritance vs. unmixing – that have been proposed to explain the origin of the observed isotope heterogeneities, and discuss their respective implications for cloud infall and thermal processing in the disk.

We also discuss how the extension of nucleosynthetic anomaly analyses to other chondritic components (Ameboid Olivine Aggregates, chondrules, matrix) has started to yield insights into transport, processing and mixing of dust in the disk. Limitations, open questions and key avenues for future work are presented in closing.

François L. H. Tissot, Christoph Burkhardt, Aleksandra Kuznetsova, Andreas Pack, Martin Schiller, Fridolin Spitzer, Elishevah M. M. E. Van Kooten, Teng Ee Yap

Subjects: Earth and Planetary Astrophysics (astro-ph.EP); Solar and Stellar Astrophysics (astro-ph.SR)
Cite as: arXiv:2509.14539 [astro-ph.EP] (or arXiv:2509.14539v1 [astro-ph.EP] for this version)
https://doi.org/10.48550/arXiv.2509.14539
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Journal reference: Tissot, F.L.H., Burkhardt, C., Kuznetsova, A. et al. Infall and Disk Processes – the Message from Meteorites. Space Sci Rev 221, 85 (2025)
Related DOI:
https://doi.org/10.1007/s11214-025-01207-0
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Submission history
From: Teng Ee Yap
[v1] Thu, 18 Sep 2025 02:13:18 UTC (9,343 KB)
https://arxiv.org/abs/2509.14539

Astrobiology, Astrochemistry,