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We report the first detections of OH$^+$ emission in planetary nebulae (PNe).As part of an imaging and spectroscopy survey of 11 PNe in the far-IR using thePACS and SPIRE instruments aboard the Herschel Space Observatory, we performeda line survey in these PNe over the entire spectral range between 51 and672$\mu$m to look for new detections. OH$^+$ rotational emission lines at152.99, 290.20, 308.48, and 329.77$\mu$m were detected in the spectra of threeplanetary nebulae: NGC 6445, NGC 6720, and NGC 6781. Excitation temperaturesand column densities derived from these lines are in the range of 27 to 47 Kand 2$\times$10$^{10}$ to 4 $\times$10$^{11}$ cm$^{-2}$, respectively. In PNe,the OH+ rotational line emission appears to be produced in thephotodissociation region (PDR) in these objects. The emission of OH+ isobserved only in PNe with hot central stars (T$_{eff}$ > 1 K), suggestingthat high-energy photons may play a role in the OH+ formation and its lineexcitation in these objects, as it seems to be the case for ultraluminousgalaxies.

Herschel Planetary Nebula Survey (HerPlaNS) - First Detection of OH+ in Planetary Nebulae