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Neptune's HCl upper limit from Herschel/HIFI

Irwin, P. G. J.; Teanby, N. A.; Gould, B.

Here we search for hydrogen chloride (HCl) in Neptune's stratosphere using observations of the 1876.22 GHz J=3-2 transition from the Heterodyne Instrument for the Far-Infrared (HIFI) on Herschel. Observations comprise a 7.2 hr disc-averaged integration, originally designed to investigate stratospheric methane. Significant HCl emission was not dete…