Chronometric Habitability and Atmospheric Persistence on LHS 1140 b: A CAT-12 Systems-Level Stability Analysis

This paper presents a chronometric, systems-level analysis of the exoplanet LHS 1140 b, reframing planetary habitability as a problem of long-term persistence and stability across deep time, rather than a static equilibrium condition. Traditional habitability assessments rely heavily on instantaneous criteria such as stellar flux, orbital position, or present-day atmospheric composition. In contrast, this study applies Cosmic Algorithm Theory-12 (CAT-12) as a chronometric organizing framework that integrates established planetary physics across interacting timescales. The analysis emphasizes endurance, tolerance bands, and resistance to irreversible regime shifts as the defining prerequisites for sustained planetary viability. Using constraints from stellar evolution models, atmospheric escape theory, and three-dimensional climate circulation studies, the paper evaluates whether LHS 1140 b plausibly occupies a persistent stability corridor—a regime in which atmospheric retention, climate coherence, and spatially localized habitable niches could endure across gigayear timescales despite tidal locking and early stellar activity. Key findings suggest that LHS 1140 b’s relatively high mass, inferred surface gravity, and orbit around a long-lived M-dwarf star enhance its resistance to atmospheric erosion and large-scale climate collapse. Rather than asserting present-day habitability or the existence of life, the study classifies LHS 1140 b as a high-endurance terrestrial candidate, where habitability—if present—would most likely manifest through localized persistence windows (e.g., terminator regions or shielded environments) rather than globally uniform conditions. The CAT-12 framework does not introduce new physical laws. Instead, it provides a temporal ordering of existing, peer-reviewed planetary science, clarifying why certain systems plausibly endure while others fail despite favorable instantaneous conditions. The paper further outlines testable observational predictions, including expectations for atmospheric compositional coherence, moderated thermal gradients, and the absence of runaway loss signatures, relevant to upcoming infrared spectroscopy campaigns. By centering time as a primary constraint on complexity, this work argues that endurance—not temperature alone—may be the most discriminating criterion for identifying life-supporting worlds. LHS 1140 b is presented as a critical case study in this emerging chronometric perspective on exoplanet habitability. Keywords:Exoplanet habitability; chronometric stability; atmospheric persistence; CAT-12; M-dwarf systems; LHS 1140 b; tidal locking; systems resilience; deep-time climate dynamics