Abstract
We calculate collision strengths and their thermally-averaged Maxwellian values for electron excitation and de-excitation between the fifteen lowest levels of singly-ionised cobalt, Co+, which give rise to emission lines in the near- and mid-infrared. Transition probabilities are also calculated and relative line intensities predicted for conditions typical of supernova ejecta. The diagnostic potential of the 10.52, 15.46 and 14.74 micro-metre transition lines is briefly discussed.
Highlights
Cobalt transition lines are useful astronomical probes especially in analysing the observational data of supernovae (SNe) where these emissions can be used to assess the nucleosynthesis and decay processes associated with the SN explosion
Relevant observational data related to the SN spectra in general and to the IR lines in particular have been gathered in the past using various instruments such as the Infrared Spectrograph (IRS) on the Spitzer Space Telescope and Himalaya Faint Object Spectrograph Camera (HFOSC) on the Himalayan Chandra Telescope (see e.g. Sahu et al (2006) and Jerkstrand et al (2012))
We report computational atomic data in the form of collision strengths and their thermally-averaged Maxwellian values for electron excitation and de-excitation between the 15 lowest levels of Co+ as well as transition probabilities for a number of the forbidden lines of Co ii in the infrared section of the spectrum
Summary
Cobalt transition lines are useful astronomical probes especially in analysing the observational data of supernovae (SNe) where these emissions can be used to assess the nucleosynthesis and decay processes associated with the SN explosion. The calculations, which are based on employing the Superstructure code (Eissner et al 1974; Nussbaumer & Storey 1978), have included summarisation of similar calculations for Co i and Co iii transitions These data were intended to facilitate the analysis of the observations of SNe in general and SN1987A in particular. We report computational atomic data in the form of collision strengths and their thermally-averaged Maxwellian values for electron excitation and de-excitation between the 15 lowest levels of Co+ as well as transition probabilities for a number of the forbidden lines of Co ii in the infrared section of the spectrum.
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