The Spatially Resolved Bipolar Nebula Of Sakurai'S Object. Ii. Mapping The Planetary Nebula Expansion

Observations of the ejecta from the final flash (FF) of helium shell burning in Sakurai's Object (V4334 Sgr) are presented for 2015-2019, a period similar to 20-24 yr after discovery. Adaptive optics images at K-s trace the expanding debris. While most of the ejecta mass is in similar to 200 K dust, a small fraction, similar to 0.4%, of the dust mass is at similar to 760 K. The 760 K continuum dominates the near-IR images. Spatial-spectral images in He i 10830 A show an similar to 16 diameter bipolar planetary nebula at position angle 21 degrees 5 degrees with the SW moving toward us and the NE moving away. Seen in integrated light, the nebula is nearly circular. Near-IR continuum images show ejecta moving radially away from a bright central point source. High-resolution mid-IR spectra reveal molecular hydrocarbon lines with an expansion velocity of 270 5 km s(-1) seen in absorption against the dust continuum. The hydrocarbons originate in material produced in the FF. The bipolar nebula and debris clouds are discussed in the context of a highly inclined disk model. The proper motion has been measured placing V4334 Sgr in the thick disk population. There is no evidence that a hot white dwarf Wolf-Rayet ([WR]) wind has emerged; no [WR] spectral features were detected. The possibility of a binary companion involved in the evolution is discussed.