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The new NIKA2 camera at the IRAM 30m radiotelescope was used to observe threeknown debris disks in order to constrain the SED of their dust emission in themillimeter wavelength domain. We have found that the spectral index between thetwo NIKA2 bands (1mm and 2mm) is consistent with the Rayleigh-Jeans regime(lambda^{-2}), unlike the steeper spectra (lambda^{-3}) measured in thesubmillimeter-wavelength domain for two of the three disks $-$ around the starsVega and HD107146. We provide a succesful proof of concept to model thisspectral inversion in using two populations of dust grains, those smaller andthose larger than a grain radius a0 of 0.5mm. This is obtained in breaking theslope of the size distribution and the functional form of the absorptioncoefficient of the standard model at a0. The third disk - around the starHR8799 - does not exhibit this spectral inversion but is also the youngest.

Debris disks around stars in the NIKA2 era