Type Ia Supernova Explosion Models

TLDR

Type Ia supernovae, key tools for measuring the universe’s expansion, are thought to arise from Chandrasekhar‑mass white dwarfs, yet the exact explosion mechanism remains uncertain. This review surveys recent advances in modeling type Ia supernovae and the remaining open questions. The authors focus on the explosion mechanism and turbulent nuclear combustion in degenerate stars, while also considering observational constraints.

Abstract

▪ Abstract Because calibrated light curves of type Ia supernovae have become a major tool to determine the local expansion rate of the universe and also its geometrical structure, considerable attention has been given to models of these events over the past couple of years. There are good reasons to believe that perhaps most type Ia supernovae are the explosions of white dwarfs that have approached the Chandrasekhar mass, [Formula: see text], and are disrupted by thermonuclear fusion of carbon and oxygen. However, the mechanism whereby such accreting carbon-oxygen white dwarfs explode continues to be uncertain. Recent progress in modeling type Ia supernovae as well as several of the still open questions are addressed in this review. Although the main emphasis is on studies of the explosion mechanism itself and on the related physical processes, including the physics of turbulent nuclear combustion in degenerate stars, we also discuss observational constraints.