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We report interferometric mapping of the bipolar pre-planetary nebula IRAS08005-2356 with an angular-resolution of ~1"-5", using the Submillimeter Array(SMA), in the 12CO J=2-1, 3-2, 13CO J=2-1 and SiO J=5-4 (v=0) lines.Single-dish observations, using the SMT 10-m, were made in these lines as wellas in the CO J=4-3 and SiO J-6-5 (v=0) lines. The lines profiles are verybroad, showing the presence of a massive (>0.1 Msun), extreme high-velocityoutflow (V~200 km/s) directed along the nebular symmetry axis derived from theHST imaging of this object. The outflow's scalar momentum far exceeds thatavailable from radiation pressure of the central post-AGB star, and it may belaunched from an accretion disk around a main-sequence companion. We provideindirect evidence for such a disk from its previously published, broad H-alphaemission profile, which we propose results from Ly-beta emission generated inthe disk followed by Raman-scattering in the innermost regions of a fast,neutral wind.

An Extreme High-Velocity Bipolar Outflow in the Pre-Planetary Nebula IRAS 08005-2356