Panchromatic HST/WFC3 Imaging Studies of Young, Rapidly Evolving Planetary Nebulae. I. NGC 6302

Abstract

We present the results of a comprehensive, near-UV-to-near-IR Hubble Space Telescope WFC3 imaging study of the young planetary nebula (PN) NGC 6302, the archetype of the class of extreme bi-lobed, pinched-waist PNe that are rich in dust and molecular gas. The new WFC3 emission-line image suite clearly defines the dusty toroidal equatorial structure that bisects NGC 6302's polar lobes, and the fine structures (clumps, knots, and filaments) within the lobes. The most striking aspect of the new WFC3 image suite is the bright, S-shaped 1.64 micron [Fe II] emission that traces the southern interior of the east lobe rim and the northern interior of the west lobe rim, in point-symmetric fashion. We interpret this [Fe II] emitting region as a zone of shocks caused by ongoing, fast (~100 km/s), collimated, off-axis winds from NGC 6302's central star(s). The [Fe II] emission and a zone of dusty, N- and S-rich clumps near the nebular symmetry axis form wedge-shaped structures on opposite sides of the core, with boundaries marked by sharp azimuthal ionization gradients. Comparison of our new images with earlier HST/WFC3 imaging reveals that the object previously identified as NGC 6302's central star is a foreground field star. Shell-like inner lobe features may instead pinpoint the obscured central star's actual position within the nebula's dusty central torus. The juxtaposition of structures revealed in this HST/WFC3 imaging study of NGC 6302 presents a daunting challenge for models of the origin and evolution of bipolar PNe.

22 pages, 11 figures; submitted to AAS Journals

References in corpus (10)

• Gaia-2MASS 3D maps of Galactic interstellar dust within 3 kpc
• The impact of companions on stellar evolution
• A Near-Infrared and X-ray Study of W49B: A Wind Cavity Explosion
• Hubble-type outflows of the high-excitation, poly-polar planetary nebula NGC 6302 -- from expansion proper motions
• The massive expanding molecular torus in the planetary nebula NGC 6302
• A New Radio Molecular Line Survey of Planetary Nebulae: HNC/HCN as a Diagnostic of Ultraviolet Irradiation
• ALMA high spatial resolution observations of the dense molecular region of NGC 6302
• Massive expanding torus and fast outflow in planetary nebula NGC 6302
• Models of the Mass-Ejection Histories of pre Planetary Nebulae, III. The Shaping of Lobes by post-AGB Winds
• Distance mapping applied to four well-known planetary nebulae and a nova shell

Cited by in corpus (6)

• Panchromatic HST/WFC3 Imaging Studies of Young, Rapidly Evolving Planetary Nebulae. II. NGC 7027
• Morphologies and Central Stars of Planetary Nebulae in the Galactic bulge from VLT, $\text{HST}$ and Pan-STARRS imaging
• The symbiotic and bipolar nebula M2-9: Morphological variability of the collimated ionized wind arising from the core
• Distribution and Kinematics of H I through Raman He II Spectroscopy of NGC 6302
• Detection of CO${}_2$ ice in the planetary nebula NGC 6302
• [Fe II] 1.644$\mu$m imaging survey of planetary nebulae with low-ionisation structures