Common Envelope Shaping of Planetary Nebulae. III. The Launching of Jets in Proto-Planetary Nebulae

Abstract

We compute successfully the launching of two magnetic winds from two circumbinary disks formed after a common envelope event. The launching is produced by the increase of magnetic pressure due to the collapse of the disks. The collapse is due to internal torques produced by a weak poloidal magnetic field. The first wind can be described as a wide jet, with an average mass-loss rate of ∼ 1.3 × 10 −7 M yr −1 and a maximum radial velocity of ∼ 230 km s −1 . The outflow has a half-opening angle of ∼ 20 • . Narrow jets are also formed intermittently with velocities up to 3,000 km s −1 , with mass-loss rates of ∼ 6 × 10 −12 M yr −1 during short periods of time. The second wind can be described as a wide X-wind, with an average mass-loss rate of ∼ 1.68 × 10 −7 M yr −1 and a velocity of ∼ 30 km s −1 . A narrow jet is also formed with a velocity of 250 km s −1 , and a mass-loss rates of ∼ 10 −12 M yr −1 .The computed jets are used to provide inflow boundary conditions for simulations of proto-planetary nebulae. The wide jet evolves into a molecular collimated outflow within a few astronomical units, producing proto-planetary nebulae with bipolar, elongated shapes, whose kinetic energies reach ∼ 4 × 10 45 erg at 1,000 years. Similarities with observed features in W43A, OH231.8+4.2, and Hen 3-1475 are discussed.The computed wide X-wind produces proto-planetary nebulae with slower expansion velocities, with bipolar and elliptical shapes, and possible starfish type and quadrupolar morphology.

Bipolar planetary nebulae from common envelope evolution of binary stars

“…Ad-hoc central engines have been applied in toy models of post-CE systems and demonstrate that such models can indeed reproduce a wide variety of features found in PNe. Suggested engines include enhanced radiation-driven winds (spher-ically symmetric as well as bipolar; Morris 1981;García-Segura et al 2005;Zou et al 2020), magnetically-driven winds (García-Segura et al 2020) and jets launched from a (circumbinary) disk (Soker & Livio 1994;Garcia-Segura et al 2021).…”