2005ApJ...624..232A

We present new multiline and 3 mm continuum interferometer observations of the circumstellar environment within 2x10⁴ AU of the class 0 protostar IRAS 05295+1247, the source of the RNO 43 outflow. The high-resolution molecular line and continuum images enable a thorough study of the circumstellar envelope, the molecular outflow, and its impact on the surroundings. We detect a highly collimated bipolar molecular outflow seen in the ¹²CO (1-0) map, which we interpret to be a new outflow episode, undetected in previous observations of the RNO 43 outflow. The medium-density gas of the outer circumstellar envelope, which is traced by the ¹³CO (1-0) emission, is accelerated over an extended volume and not confined to the narrow ¹²CO outflow axis. Our data also suggest that the outflow affects the chemical composition of the surroundings, enhancing the HCO⁺ (1-0) abundance along its edges. Most importantly, the kinetic energy injected by the outflow is sufficient to produce a velocity gradient in the dense inner circumstellar envelope traced by the C¹⁸O (1-0) and H¹³CO⁺ (1-0) emission. Such a strong perturbation to the envelope will clearly have an important effect on the mass-assembling process in IRAS 05295+1247.