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We present an analysis of 11 bright far-IR/submm sources discovered through acombination of the Planck survey and follow-up Herschel-SPIRE imaging. Eachsource has a redshift z=2.2-3.6 obtained through a blind redshift search withEMIR at the IRAM 30-m telescope. Interferometry obtained at IRAM and the SMA,and optical/near-infrared imaging obtained at the CFHT and the VLT revealmorphologies consistent with strongly gravitationally lensed sources.Additional photometry was obtained with JCMT/SCUBA-2 and IRAM/GISMO at 850 umand 2 mm, respectively. All objects are bright, isolated point sources in the18 arcsec beam of SPIRE at 250 um, with spectral energy distributions peakingeither near the 350 um or the 500 um bands of SPIRE, and with apparentfar-infrared luminosities of up to 3x10^14 L_sun. Their morphologies and sizes,CO line widths and luminosities, dust temperatures, and far-infraredluminosities provide additional empirical evidence that these are stronglygravitationally lensed high-redshift galaxies. We discuss their dust masses andtemperatures, and use additional WISE 22-um photometry and template fitting torule out a significant contribution of AGN heating to the total infraredluminosity. Six sources are detected in FIRST at 1.4 GHz. Four have fluxdensities brighter than expected from the local far-infrared-radio correlation,but in the range previously found for high-z submm galaxies, one has a deficitof FIR emission, and 6 are consistent with the local correlation. The globaldust-to-gas ratios and star-formation efficiencies of our sources arepredominantly in the range expected from massive, metal-rich, intense,high-redshift starbursts. An extensive multi-wavelength follow-up programme isbeing carried out to further characterize these sources and the intensestar-formation within them.

Planck's Dusty GEMS: Gravitationally lensed high-redshift galaxies discovered with the Planck survey