# Extreme Debris Disks: Insights into Violent Collisions in Planet Formation and Destruction

**Authors:** Kate Y. L. Su, Attila Moor, Agnes Kospal, George H. Rieke, Antranik A. Sefilian, Renu Malhotra, Ilaria Pascucci, Alan P. Jackson, Peter Abraham, Nicholas P. Ballering  
**arXiv:** [2607.06684](https://arxiv.org/abs/2607.06684)  
**Date:** 2026-07-07  
**Summary page:** https://www.summarizepaper.com/en/paper/2607.06684v1/

## Key points

- Extreme debris disks (EDDs) are a subset of debris systems exhibiting stochastic infrared variability caused by large-scale collisions between Moon- and Mars-sized bodies.
- Analysis of JWST and Spitzer mid-infrared spectra for 21 EDDs aims to uncover the connection between impact-produced dust mineralogy, age, and dynamical state during planet formation and evolution.
- EDDs contain a higher concentration of optically thin, small dust grains compared to protoplanetary and typical debris disks, with submicron-sized grains showing thermal alteration and abundance of silica and crystalline silicate composition.
- Infrared variability in EDDs distinguishes them as a distinct subclass within debris systems, providing insights into violent events during terrestrial planet formation.
- Features in EDDs can serve as potential markers for identifying planetary systems undergoing dynamical instability.
- The study includes detailed discussions on JWST observations, data reduction techniques, methodology for extracting dust features, exploration into unique characteristics observed in EDDs focusing on small thermally altered grains and infrared variability, technical details in Appendices B and C, comparisons with theoretical expectations concerning various phases of planet formation in Section 4, and key insights summarized in Section 5.

## Summary

In this study, we delve into the unique characteristics of extreme debris disks (EDDs), a subset of debris systems exhibiting stochastic infrared variability believed to be caused by large-scale collisions between Moon- and Mars-sized bodies. By analyzing JWST and Spitzer mid-infrared spectra for 21 EDDs, we aim to uncover the connection between impact-produced dust mineralogy and the age and dynamical state of these systems during various stages of planet formation and evolution. Our findings reveal that EDDs contain a higher concentration of optically thin, small dust grains compared to protoplanetary and typical debris disks. These submicron-sized grains exhibit thermal alteration, as evidenced by their abundance of silica and crystalline silicate composition. Additionally, our analysis highlights the presence of infrared variability in EDDs, further distinguishing them as a distinct subclass within the realm of debris systems. By providing insights into the physical conditions surrounding violent events during terrestrial planet formation, our results offer valuable information for differentiating the outcomes of impactful collisions. Moreover, the identified features in EDDs serve as potential markers for identifying planetary systems undergoing dynamical instability. The paper is structured with detailed discussions on JWST observations, data reduction techniques, and methodology for extracting dust features in Section 2. Further exploration into the unique characteristics observed in EDDs is presented in Sections 3.1 and 3.2, focusing on small thermally altered grains and infrared variability. Technical details are elaborated in Appendices B and C. The broader implications of our findings concerning various phases of planet formation are discussed in Section 4 where comparisons are drawn with theoretical expectations. Finally, we conclude our study in Section 5 by summarizing key insights gained from our analysis of EDDs using JWST and Spitzer mid-infrared spectra.