Envelope Removal by Jets in the Grazing Envelope Evolution

  Sagiv Shiber  

I conduct three-dimensional hydrodynamical simulations, and show that when a secondary star launches jets while interacting with a primary giant star in a close orbit, the jets facilitate the removal of the giant envelope. I assume that the secondary star accretes mass via an accretion disk and that the accretion disk launches the jets. The results indicate that the jets eject most of the envelope gas and unbind a part of it. The jets produce high velocity outflow in the polar directions that can be as massive as the equatorial outflow. When comparing simulations with and without jets, the final orbital separation is larger and the orbit is more eccentric when jets are included. These results show that jets can play a crucial role in the ejection of the envelope and in the shaping of the outflow.