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Transneptunian objects (TNOs) are bodies populating the Kuiper Belt and theyare believed to retain the most pristine and least altered material of thesolar system. The Herschel Open Time Key Program entitled "TNOs are Cool: Asurvey of the trans-Neptunian region" has been awarded 373 h to investigate thealbedo, size distribution and thermal properties of TNOs and Centaurs. Here wefocus on the brightest targets observed by both the PACS and SPIRE multibandphotometers: the dwarf planet Haumea, six TNOs (Huya, Orcus, Quaoar, Salacia,2002 UX25, and 2002 TC302), and two Centaurs (Chiron and Chariklo). Fluxdensities are derived from PACS and SPIRE instruments using optimised datareduction methods. The spectral energy distribution obtained with the HerschelPACS and SPIRE instruments over 6 bands (centred at 70, 100, 160, 250, 350, and500 $\mu$m), and with Spitzer-MIPS at 23.7 and 71.4 $\mu$m has been modelledwith the NEATM thermal model in order to derive the albedo, diameter, andbeaming factor. For the Centaurs Chiron and Chariklo and for the 1000 km sizedOrcus and Quaoar, a thermophysical model was also run to better constrain theirthermal properties. We derive the size, albedo, and thermal properties,including thermal inertia and surface emissivity, for the 9 TNOs and Centaurs.Several targets show a significant decrease in their spectral emissivitylongwards of $\sim$300 $\mu$m and especially at 500 $\mu$m. Using our sizeestimations and the mass values available in the literature, we also derive thebulk densities for the binaries Quaoar/Weywot (2.18$^{+0.43}_{-0.36}$g/cm$^3$), Orcus/Vanth (1.53$^{+0.15}_{-0.13}$ g/cm$^3$), and Salacia/Actea(1.29$^{+0.29}_{-0.23}$ g/cm$^3$). Quaoar's density is similar to that of theother dwarf planets Pluto and Haumea, and its value implies high contents ofrefractory materials mixed with ices.

TNOs are Cool: A survey of the trans-Neptunian region. VIII. Combined Herschel PACS and SPIRE observations of 9 bright targets at 70--500 micron