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 3000 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 rate 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 1000 yr. Similarities with observed features in W43A, OH 231.8+4.2, and Hen 3-1475 are discussed. The computed wide X-wind produces proto−planetary nebulae with slower expansion velocities, bipolar and elliptical shapes, and possible starfish-type and quadrupolar morphology.