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We present the first far-IR observations of the solar-type stars delta Pav,HR 8501, 51 Peg and zeta^2 Ret, taken within the context of the DUNES HerschelOpen Time Key Programme (OTKP). This project uses the PACS and SPIREinstruments with the objective of studying infrared excesses due to exo-Kuiperbelts around nearby solar-type stars. The observed 100 um fluxes from deltaPav, HR 8501, and 51 Peg agree with the predicted photospheric fluxes,excluding debris disks brighter than Ldust/Lstar ~ 5 x 10^-7 (1 sigma level)around those stars. A flattened, disk-like structure with a semi-major axis of~ 100 AU in size is detected around zeta^2 Ret. The resolved structure suggeststhe presence of an eccentric dust ring, which we interpret as an exo-Kuiperbelt with Ldust/Lstar ~ 10^-5.

Cold dust around nearby stars (DUNES). First results: A resolved exo-Kuiper belt around the solar-like star zeta^2 Ret