Jets from main sequence and white dwarf companions during common envelope evolution
Yangyuxin Zou, Luke Chamandy, Jonathan Carroll-Nellenback, Eric G., Blackman, Adam Frank

TL;DR
This study uses 3D hydrodynamical simulations to investigate how jets from companions during common envelope evolution influence orbital dynamics and envelope unbinding, revealing jets can increase unbound mass by up to 10%.
Contribution
First simulation study incorporating jet feedback in common envelope evolution, analyzing its effects on orbital change and envelope unbinding.
Findings
Jets become choked around first periastron passage.
Jets increase unbound mass by up to 10%.
Jet parameters influence envelope morphology and unbinding efficiency.
Abstract
It has long been speculated that jet feedback from accretion onto the companion during a common envelope (CE) event could affect the orbital evolution and envelope unbinding process, but this conjecture has heretofore remained largely untested. We present global 3D hydrodynamical simulations of CE evolution (CEE) that include a jet subgrid model and compare them with an otherwise identical model without a jet. Our binary consists of a red giant branch primary and a or main sequence or white dwarf secondary companion modeled as a point particle. We run the simulations for 10 orbits (40 days). Our jet model adds mass at a constant rate of order the Eddington rate, with maximum velocity of order the escape speed, to two spherical sectors with the jet axis perpendicular to the orbital plane, and supplies kinetic energy…
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