The Common Envelope Evolution Outcome—A Case Study on Hot Subdwarf B Stars

Common envelope evolution (CEE) physics plays a fundamental role in the formation of binary systems, such as mergering stellar gravitational wave sources, pulsar binaries and type Ia supernovae. A precisely constrained CEE has become more important age large surveys detectors. We use an adiabatic mass loss model to explore how total energy donor changes function remnant mass. This provides self-consistent way calculate binding donor. For comparison, we also through integrating from core surface. The outcome is by conservation at point which both component's radii shrink back within their Roche lobes. apply our results 142 hot subdwarf binaries. shorter orbital period sdBs, highly consistent. longer sdBs samples, can differ up factor 2. CE efficiency parameter $\beta_\mathrm{CE}$ becomes smaller than $\alpha_\mathrm{CE}$ for final $\log_{10} P_{\mathrm{orb}}/\mathrm{d} > -0.5$. find ratios q$ parameters \alpha_{\mathrm{CE}}$ \beta_{\mathrm{CE}}$ linearly correlate similarly De Marco et al. (2010) post-AGB