The new NIKA2 camera at the IRAM 30m radiotelescope was used to observe three known debris disks in order to constrain the SED of their dust emission in the millimeter wavelength domain. We have found that the spectral index between the two NIKA2 bands (1mm and 2mm) is consistent with the Rayleigh-Jeans regime (lambda^{-2}), unlike the steeper spectra (lambda^{-3}) measured in the submillimeter-wavelength domain for two of the three disks − around the stars Vega and HD107146. We provide a succesful proof of concept to model this spectral inversion in using two populations of dust grains, those smaller and those larger than a grain radius a0 of 0.5mm. This is obtained in breaking the slope of the size distribution and the functional form of the absorption coefficient of the standard model at a0. The third disk - around the star HR8799 - does not exhibit this spectral inversion but is also the youngest.
@article{arxiv.1911.06250,
title = {Debris disks around stars in the NIKA2 era},
author = {J. -F. Lestrade and J. -C. Augereau and M. Booth and R. Adam and P. Ade and P. Andre and A. Andrianasolo and H. Aussel and A. Beelen and A. Benoit and A. Bideaud and O. Bourrion and M. Calvo and A. Catalano and B. Comis and M. De Petris and F. -X. Desert and S. Doyle and E. F. C. Driessen and A. Gomez and J. Goupy W. Holland and F. Keruzore and C. Kramer and B. Ladjelate and G. Lagache and S. Leclercq and C. Lefevre and J. F. Macias-Perez and P. Mauskopf and F. Mayet and A. Monfardini and L. Perotto and G. Pisano and N. Ponthieu and V. Reveret and A. Ritacco and C. Romero and H. Roussel and F. Ruppin and K. Schuster and S. Shu and A. Sievers and P. Thebault and C. Tucker and R. Zylka},
journal= {arXiv preprint arXiv:1911.06250},
year = {2020}
}
Comments
6 pages, 8 figures, to appear in the proceedings of the international conference entitled mm Universe @ NIKA2, Grenoble (France), June 2019, EPJ Web of conferences