Some Thoughts on the Convective Urca Process

TL;DR

This paper discusses the complex and unresolved effects of the convective Urca process on stellar evolution, especially in white dwarfs near the Chandrasekhar limit, sharing personal insights and preliminary findings.

Contribution

It offers a collection of personal thoughts and preliminary insights on the convective Urca process, highlighting its impact on stellar evolution without definitive conclusions.

Findings

Preliminary insights into the convective Urca process

Discussion of its effects during high-density carbon burning

Additional relevant results in Appendix B

Abstract

I have repeatedly grappled with the question of how the convective Urca process affects stellar evolution, in particular during the high-density convective carbon burning that can occur in near-Chandrasekhar-mass white dwarfs. This manuscript collects some fragmentary thoughts from various failed and abandoned attempts. This is not a complete work, does not provide a comprehensive overview of the literature, and has no definitive conclusions. It is posted in the hope that some part of it might prove useful to someone at some point in the future. I also take this opportunity to include anotter important result of more general interest (Appendix B).