Oral Presentation

Discovery of a Jet-like Outflow in the Pre-planetary Nebula IRAS 17150-3224 using ALMA Observations of SO and SiO Emissions

Author(s): Po-Sheng Huang (ASIAA), Chin-Fei Lee (ASIAA), and Raghvendra Sahai (JPL)

Presenter: Po-Sheng Huang (ASIAA)

We present the discovery of a jet-like outflow in the pre-planetary nebula (PPN) IRAS 17150-3224 using ALMA observations of SO and SiO emissions. The angular resolution is ~0. 07. The jet-like outflow is propagating along the middle path of the other two pairs of CO bipolar outflows. It extends to ~7500 au from the center of the source, shorter than that of CO outflows with a length of ~9600 au. In the position-velocity map along the outflow axis, a linear velocity gradient is observed in the SO and SiO emissions. In this map, the SO emission traces the base of the jet-like outflow where the shock velocity is smaller than ~25 km/s, and the SiO emission traces higher up in the outflow where the shock velocity is greater than ~25 km/s. This newly discovered jet-like outflow suggests that this source could be shaped by a precessing wind launched from a precessing disk in a binary system. The SO and SiO emissions also trace the shock of a bipolar equatorial outflow which has been observed in the CO emission.