Spatio-Topological and Multi-Physics Analysis of Instantaneous Mass Ejection and its Statistical Properties in a Red Supergiant Binary

Abstract: Understanding mass loss from Red Supergiants (RSGs) in binary systems is crucial for stellar evolution, with complex hydrodynamics and radiation driving episodic mass ejection. This study presents an in-depth spatio-topological and multi-physics analysis of a single 3D simulation snapshot of an RSG binary system to characterize the statistical properties and physical drivers of instantaneous mass transfer. Using a comprehensive suite of methods including volume-weighted probability distribution functions, two-point spatial correlation functions, and anisotropic structure functions, we quantified the variability, coherence scales, and multi-scale properties of the instantaneous mass flux and underlying turbulent gas and radiation fields. Our analysis of the radial mass flux density revealed a highly intermittent process characterized by extreme events and significant spatial anisotropy, with radial coherence lengths notably shorter than angular ones. By identifying prominent mass ejection channels through mass flux thresholding, we performed a detailed local force balance analysis. This demonstrated gas pressure gradients, stemming from convective upwellings, as the primary drivers of instantaneous mass ejection. Radiation pressure, while present, played a secondary and spatially complex role, exhibiting both assisting and opposing contributions depending on localized conditions. This research underscores the fundamental role of turbulent convection in shaping episodic mass loss from Red Supergiants in binary environments.

Subjects:	astro-ph.CO; cs.LG
Cite as:	PX:2508.00013