Planck intermediate results. XVIII The millimetre and sub-millimetre emission from planetary nebulae

Abstract

Late stages of stellar evolution are characterized by copious mass-loss events whose signature is the formation of circumstellar envelopes (CSE). Planck multi-frequency measurements have provided relevant information on a sample of Galactic planetary nebulae (PNe) in the important and relatively unexplored observational band between 30 and 857GHz. Planck enables the assembly of comprehensive PNe spectral energy distributions (SEDs) from radio {\bf to} far-infrared frequencies. Modelling of the derived SEDs provides us with information on physical properties of CSEs and the mass content of both main components: ionised gas, traced by the free-free emission at cm--mm waves; and thermal dust, traced by the millimetre and far-IR emission. In particular, the amount of ionised gas and dust has been derived here. Such quantities have also been estimated for the very young PN CRL618, where the strong variability observed in its radio and millimetre emission has previously prevented the construction of its SED. A morphological study of the Helix Nebula has also been performed. Planck maps reveal, for the first time, the spatial distribution of the dust inside the envelope, allowing us to identify different components, the most interesting of which is a very extended component (up to 1pc) that may be related to a region where the slow expanding envelope is interacting with the surrounding interstellar medium.

18 pages, 14 figures; accepted for publication in A&A

References in corpus (18)

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• The SCUBA Legacy Catalogue: Continuum Objects Detected by SCUBA
• The Wilkinson Microwave Anisotropy Probe (WMAP) Source Catalog
• The Magellanic Cloud Calibration of the Galactic Planetary Nebula Distance Scale
• The Mexican Hat Wavelet Family. Application to point source detection in CMB maps
• Comparison of filters for the detection of point sources in Planck simulations
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• Infrared Observations of The Helix Planetary Nebula
• A centimetre-wave excess over free-free emission in planetary nebulae
• Quasi-simultaneous multi-frequency observations of inverted-spectrum GPS candidate sources
• Rings and Halos in the Mid-Infrared: The Planetary Nebulae NGC 7354 and NGC 3242
• Submillimeter Array Observation of the Proto-Planetary Nebula CRL 618 in the CO J=6-5 Line
• The dust envelope of the pre-planetary nebula IRAS19475+3119
• Abundances of Planetary Nebulae NGC3242 and NGC6369
• Structure and clumping in the fast wind of NGC6543
• ATCA observations of the very young Planetary Nebula SAO 244567
• The Halo and Rings of the Planetary Nebula NGC 40 in the Mid-Infrared
• Millimeter observations of Planetary Nebulae: a contribution to the Planck pre-launch catalogue

Cited by in corpus (4)

• Kepler-432 b: a massive planet in a highly eccentric orbit transiting a red giant
• Herschel imaging of the dust in the Helix Nebula (NGC 7293)
• Atomic Modeling of Photoionization Fronts in Nitrogen Gas
• Evidence for cold plasma in planetary nebulae from radio observations with the LOw Frequency ARray (LOFAR)