Multiple Fast Molecular Outflows in the PPN CRL 618

Abstract

CRL 618 is a well-studied pre-planetary nebula. It has multiple highly collimated optical lobes, fast molecular outflows along the optical lobes, and an extended molecular envelope that consists of a dense torus in the equator and a tenuous round halo. Here we present our observations of this source in CO J=3-2 and HCN J=4-3 obtained with the Submillimeter Array at up to ~ 0.3" resolutions. We spatially resolve the fast molecular-outflow region previously detected in CO near the central star and find it to be composed of multiple outflows that have similar dynamical ages, and are oriented along the different optical lobes. We also detect fast molecular outflows further away from the central star near the tips of the extended optical lobes and a pair of equatorial outflows inside the dense torus. We find that two episodes of bullet ejections in different directions are needed, one producing the fast molecular outflows near the central star, and one producing the fast molecular outflows near the tips of the extended optical lobes. One possibility to launch these bullets is the magneto-rotational explosion of the stellar envelope.

26 pages, 8 figures

References in corpus (8)

• Preplanetary Nebulae: An HST Imaging Survey and a New Morphological Classification System
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• Astrophysical Explosions Driven by a Rotating, Magnetized, Gravitating Sphere
• Shaping Planetary Nebulae by Light Jets
• Multiple and Precessing Collimated Outflows in the Planetary Nebula IC 4634
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• Mapping the Central Region of the PPN CRL 618 at Sub-arcsecond Resolution at 350 GHz

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• HD101584: Circumstellar characteristics and evolutionary status
• An asymmetric jet launching model for the protoplanetary nebula CRL 618
• The Shaping of the Multipolar Pre-Planetary Nebula CRL 618 by Multi-directional Bullets
• Warm CO in evolved stars from the THROES catalogue. II. Herschel/PACS spectroscopy of C-rich envelopes
• Evolution from Spherical AGB Wind to Multipolar Outflow in Pre-Planetary Nebula IRAS 17150-3224