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P.J. Huggins (NYU), R. Bachiller (OAN, Madrid), T. Forveille (Obs. de Grenoble), P. Cox (IAS, Paris), J.P. Maillard (IAP, Paris)
We report high resolution CO line imaging of the molecular envelopes of the young planetary nebulae M1-16 and BD+303639 using the IRAM interferometer. The observations reveal the shaping effects on the envelopes of high-velocity outflows or jets. In M1-16, the molecular envelope has been pierced by a prominent, triple jet system, which has entrained molecular gas and excavated bipolar cavities in the envelope. In BD+303639, the CO emitting gas forms a remarkable pair of high-velocity bullets that are point symmetric about the central star and signal the presence of underlying bipolar jets which have not been seen at other wavelengths. Similar phenomena with multiple outflows are seen in the proto-PN AFGL 2688 (Cox et al., A&A, in press). In all these cases, the jets have a major impact on the structure of the neutral envelopes which will dominate the morphology of the nebulae as the envelopes are photo-ionized. Our observations demonstrate the importance of jets in the shaping of planetary nebulae, and exemplify the way in which point symmetries are created in the nebulae at early stages of their formation.
This work was supported in part by NSF grant AST-9617941