Isolated Extremely Low Mass White Dwarfs: Observational Validation of the Action Collapse Framework

Isolated white dwarfs with masses below 0.3 M⊙ (Extremely Low Mass, ELM) present a paradox for standard stellar evolution: their formation via single-star evolution would require timescales exceeding the age of the universe. Conventional explanations invoke binary mass transfer, yet a population of isolated ELM white dwarfs exists without visible companions. This study reclassifies isolated ELM white dwarfs as Action Collapse Remnants—stars that reached baryonic saturation and ejected their contaminated envelopes without binary interaction. The framework predicts observable characteristics including high residual spin, spectral pollution (DAZ signatures), and degenerate core exposure. Gaia DR4 detections of isolated ELM white dwarfs provide observational validation of the contamination-driven stellar death mechanism.