PlanetPol was a ground-based, high sensitivitypolarimeter based at theWilliam Herschel Telescope[1] on the island ofLa Palma in theCanary Islands,Spain that has now been decommissioned. It was the most sensitive astronomical visual polarimeter ever built in fractional polarisation, a mantle that since its decommissioning now belongs toHIPPI. Although the device could be used for a wide range of astronomy, its primary use was thedetection of extrasolar planets.[1]
PlanetPol did not discover any extrasolar planets, however it was used to provide upper limits to planetary albedos in the known55 Cnc andτ Boo planetary systems.[2] Observations with the polarimeter in the Canary Islands, which are affected by dust from the Sahara, also identified airborne dust as a source of polarization within our atmosphere.[3] Additionally, PlanetPol provided measurements of the polarization of a few dozen nearby stars,[4] which were later combined with southern hemisphere measurements from PlanetPol's successor, HIPPI,[5] to provide information about the nature of those stars and the distribution of the interstellar medium.[6]
