Spectral Characteristics and Evolution of Type Ia Supernovae: Insights into Thermonuclear Explosions

Abstract

Type Ia supernovae (SNe Ia) are among the most luminous and uniform stellar explosions, making them valuable cosmic distance markers. This paper explores the key features of SNe Ia, focusing on their spectral evolution and the role of iron-group elements in shaping their observable properties. Beginning with their classification and theoretical models, the study highlights the homogeneity of SNe Ia, linked to the thermonuclear disruption of white dwarf stars near the Chandrasekhar limit. Through a detailed analysis of spectral transitions from early to late phases, we gain a deeper understanding of the nuclear processes driving these explosions. Additionally, the work addresses the diversity within SNe Ia subclasses, discussing their implications for cosmological studies.