Collision strengths and transition probabilities for Co II infrared forbidden lines

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.

9 pages, 4 figures, 7 tables

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• Cobalt-56 gamma-ray emission lines from the type Ia supernova 2014J
• Measuring nickel masses in Type Ia supernovae using cobalt emission in nebular phase spectra
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• Collision strengths and transition probabilities for Co III forbidden lines
• Modeling the emission lines from r-process elements in Supernova nebulae
• Transit distances and composition of low-velocity exocomets in the $\beta$ Pic system