A search for CO+ in planetary nebulae
T. A. Bell, W. Whyatt, S. Viti, M. P. Redman
TL;DR
This study systematically searches for CO+ in planetary nebulae to understand the origin of strong HCO+ emissions, revealing a potential chemical formation pathway involving CO+ and H2.
Contribution
It provides the first systematic search for CO+ in planetary nebulae and suggests a link between CO+ and HCO+ formation.
Findings
CO+ line intensity correlates with HCO+ intensity
Reaction of CO+ with H2 may produce HCO+
Implication for chemical evolution in planetary nebulae
Abstract
We have carried out a systematic search for the molecular ion CO+ in a sample of 8 protoplanetary and planetary nebulae in order to determine the origin of the unexpectedly strong HCO+ emission previously detected in these sources. An understanding of the HCO+ chemistry may provide direct clues to the physical and chemical evolution of planetary nebulae. We find that the integrated intensity of the CO+ line may be correlated with that of HCO+, suggesting that the reaction of CO+ with molecular hydrogen may be an important formation route for HCO+ in these planetary nebulae.
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