The quest for H${}_3^{+}$ at Neptune: deep burn observations with NASA IRTF iSHELL

H. Melin, L. N. Fletcher, T. S. Stallard +4

Emission from the molecular ion H${}_3^{+}$ is a powerful diagnostic of the upper atmosphere of Jupiter, Saturn, and Uranus, but it remains undetected at Neptune. In search of this emi…