The Energy Sharing Timescale in an Analytic Framework for Common Envelope Hydrodynamics
arXiv:2410.07036 · doi:10.3847/2041-8213/ada0ae
Abstract
We propose a new predictive theory for the analysis of common envelope (CE) events which incorporates the effects of relevant hydrodynamical processes into a simple analytical framework. We introduce the ejection and dynamical parameters and , which define if envelope ejection is energetically or hydrodynamically favorable, respectively, during CE inspiral. When combined, these parameters offer a detailed narrative of how inspiral begins, proceeds, and ends that is consistent with preliminary comparisons to 3D hydrodynamical models. This physically-motivated framework impacts predictions for CE outcomes, especially for systems that have energy excess, and offers promise as a potential alternative for the treatment of CE in binary population synthesis.
12 pages, 3 figures. Accepted for publication in ApJ Letters
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