Physics & Astronomy Faculty Publications
Document Type
Article
Publication Date
2-2-2026
Abstract
When neutron stars accrete matter from a companion star, this matter forms a disk around them and eventually falls on their surface. Here, the fuel can ignite into bright flashes called Type I bursts. Theoretical calculations based on state-of-the-art nuclear reactions are able to explain many features of the bursts. However, models predict that the bursts should cease at high accretion rates, whereas in many sources they disappear at much lower rates. Moreover, their recurrence times also show strong discrepancies with predictions. Although various solutions have been proposed, none can account for all the observational constraints. Here, we describe a new model that explains all the contradictory behaviors within a single picture. We are able to reconstruct the conditions on the star surface that determine the burst properties by comparing data to new simulations. We find strong evidence that the physical mechanism driving the burst behavior is the structure of the accretion disk in the regions closest to the star. This connection reconciles the puzzling burst phenomenology with nuclear physics and also opens a new window on the study of accretion processes around compact objects.
Recommended Citation
Cavecchi, Y., D. K. Galloway, A. Heger, P. Santillán-Ortega, M. Nava-Callejas, F. M. Vincentelli, L. E. Rivera Sandoval et al. "A solution to the tension of burning on neutron stars and nuclear physics." The Astrophysical Journal 998, no. 1 (2026): 25. https://doi.org/10.3847/1538-4357/ae2ff3
Creative Commons License
This work is licensed under a Creative Commons Attribution 4.0 International License.
Publication Title
The Astronomical Journal
DOI
10.3847/1538-4357/ae2ff3
Comments
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