From spherical stars to disk-like structures: 3D common-envelope evolution of massive binaries beyond inspiral

Abstract

Three-dimensional simulations usually fail to cover the entire dynamical common-envelope phase of gravitational wave progenitor systems due to the vast range of spatial and temporal scales involved. We investigated the common-envelope interactions of a $10M_{\odot }$ red supergiant primary star with a black hole and a neutron star companion, respectively, until full envelope ejection ($\gtrsim 97\%$ of the envelope mass). We find that the dynamical plunge-in of the systems determines largely the orbital separations of the core binary system, while the envelope ejection by recombination acts only at later stages of the evolution and fails to harden the core binaries down to orbital frequencies where they qualify as progenitors of gravitational-wave-emitting double-compact object mergers. As opposed to the conventional picture of a spherically symmetric envelope ejection, our simulations show a new mechanism: The rapid plunge-in of the companion transforms the spherical morphology of the giant primary star into a disk-like structure. During this process, magnetic fields are amplified, and the subsequent transport of material through the disk around the core binary system drives a fast jet-like outflow in the polar directions. While most of the envelope material is lost through a recombination-driven wind from the outer edge of the disk, about $7\%$ of the envelope leaves the system via the magnetically driven outflows. We further explored the potential evolutionary pathways of the post-common-envelope systems given the expected remaining lifetime of the primary core ($2.97M_{\odot }$) until core collapse ($6\times 10^4\mathrm{yr}$), most likely forming a neutron star. We find that the interaction of the core binary system with the circumbinary disk increases the likelihood of giving rise to a double-neutron star merger. (abridged)

17 Pages, 9 Figures, accepted by A&A

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• The hydrogen-free circumstellar interaction in the Type Ib supernova 2021efd: A clue to the mechanism of the helium-layer stripping