Multiple Collimated Outflows in the Proto-planetary Nebula GL 618

Abstract

We present narrow-band H-alpha, [S II], and [O I] Hubble Space Telescope images of the young planetary nebula GL 618. This object is a compact, bipolar nebula that is currently undergoing the transition from asymptotic giant branch star to planetary nebula. Our images confirm the presence of at least three highly collimated outflows emanating from the central regions of GL 618. We also detect H-alpha emission close to the central dust lane and in an extended scattered light halo. The three outflows are occurring simultaneously in this object, as opposed to being the result of a precessing jet. We derive an inclination for the brightest outflow in the East lobe of 39 degrees. This differs from the previous estimate of 45 degrees. In addition, our results indicate that the outflows seen in GL 618 are probably not coplanar. Line strengths derived from the narrow-band images indicate a shock velocity in the range of 40 - 100 km/s. Based on the shock velocity we estimate that the age of the outflows is less than 500 years. The outflows seen in the optical images of GL 618 are related to features seen in near-IR, CO and CS maps of this object. This relationship indicates that the outflows are playing a major role in the morphological evolution of this young planetary nebula, interacting with and shaping the neutral envelope surrounding GL 618. We discuss the implications of these jets and their interaction with the neutral envelope in the context of current models of planetary nebula formation.

accepted for publication in ApJ

References in corpus (2)

• Physical structure of the protoplanetary nebula CRL618. I. Optical long-slit spectroscopy and imaging
• Westbrook's Molecular Gun: Discovery of Near-IR Micro-Structures in AFGL 618

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• Time-dependent ejection velocity model for the outflow of Hen 3--1475
• Multiple Molecular H2 Outflows in AFGL 618
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• The Unusual Distributions of Ionized Material and Molecular Hydrogen in NGC 6881: Signposts of Multiple Events of Bipolar Ejection in a Planetary Nebula
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• The Rapidly Evolving AGB Star, V Hya: ALMA finds a Multi-Ring Circus with High-Velocity Outflows
• Mapping the Central Region of the PPN CRL 618 at Sub-arcsecond Resolution at 350 GHz
• Shock excitation of the knots of Hen 3-1475
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• Steady Twin-Jets Orientation: Implications For Their Formation Mechanism
• The molecular envelope of CRL 618: A new model based on Herschel/HIFI observations
• The Emerging Planetary Nebula CRL 618 and its Unsettled Central Star(s)
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• Detection of 4765 MHz OH Emission in a Pre-Planetary Nebula -- CRL 618
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