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We have targeted two recently discovered Lyman break galaxies (LBGs) tosearch for dust continuum and [CII] 158 micron line emission. The stronglylensed z~6.8 LBG A1703-zD1 behind the galaxy cluster Abell 1703, and thespectroscopically confirmed z=7.508 LBG z8-GND-5296 in the GOODS-N field havebeen observed with the Plateau de Bure interferometer (PdBI) at 1.2mm. Theseobservations have been combined with those of three z>6.5 Lya emitters (namedHCM6A, Himiko, and IOK-1), for which deep measurements were recently obtainedwith the PdBI and ALMA. [CII] is undetected in both galaxies, providing a deepupper limit for Abell1703-zD1, comparable to recent ALMA non-detections. Dustcontinuum emission from Abell1703-zD1 and z8-GND-5296 is not detected with anrms of 0.12 and 0.16 mJy/beam. From these non-detections we derive upper limitson their IR luminosity and star formation rate, dust mass, and UV attenuation.Thanks to strong gravitational lensing the limit for Abell1703-zD1 is probingthe sub-LIRG regime ($L_{IR} <8.1 \times 10^{10}$ Lsun) and very low dustmasses ($M_d<1.6 \times 10^7$ Msun). We find that all five galaxies arecompatible with the Calzetti IRX-$\beta$ relation, their UV attenuation iscompatible with several indirect estimates from other methods (the UV slope,extrapolation of the attenuation measured from the IR/UV ratio at lowerredshift, and SED fits), and the dust-to-stellar mass ratio is not incompatiblewith that of galaxies from z=0 to 3. For their stellar mass the high-z galaxiesstudied here have an attenuation below the one expected from the mean relationof low redshift (z<1.5) galaxies. More and deeper (sub)-mm data are clearlyneeded to directly determine the UV attenuation and dust content of thedominant population of high-z star-forming galaxies and to establish morefirmly their dependence on stellar mass, redshift, and other properties.

New constraints on dust emission and UV attenuation of z=6.5-7.5 galaxies from millimeter observations