Weak lensing of Type Ia Supernovae from the Dark Energy Survey Academic Article uri icon


  • ABSTRACT We consider the effects of weak gravitational lensing on observations of 196spectroscopically confirmed Type Ia Supernovae (SNe Ia) from years 1 to 3 of the Dark Energy Survey (DES). We simultaneously measure both the angular correlation function and the non-Gaussian skewness caused by weak lensing. This approach has the advantage of being insensitive to the intrinsic dispersion of SNe Ia magnitudes. We model the amplitude of both effects as a function of 8, and find 8 =1.2$^{+0.9}_{-0.8}$. We also apply our method to a subsample of 488SNe from the Joint Light-curve Analysis (JLA; chosen to match the redshift range we use for this work), and find 8 =0.8$^{+1.1}_{-0.7}$. The comparable uncertainty in 8 between DESSN and the larger number of SNe from JLA highlights the benefits of homogeneity of the DESSN sample, and improvements in the calibration and data analysis.

published proceedings


altmetric score

  • 1.25

author list (cited authors)

  • Macaulay, E., Bacon, D., Nichol, R. C., Davis, T. M., Elvin-Poole, J., Brout, D., ... Weller, J.

citation count

  • 6

complete list of authors

  • Macaulay, E||Bacon, D||Nichol, RC||Davis, TM||Elvin-Poole, J||Brout, D||Carollo, D||Glazebrook, K||Hinton, SR||Lewis, GF||Lidman, C||Moller, A||Sako, M||Scolnic, D||Smith, M||Sommer, NE||Tucker, BE||Abbott, TMC||Aguena, M||Annis, J||Avila, S||Bertin, E||Bhargava, S||Brooks, D||Burke, DL||Rosell, A Carnero||Kind, M Carrasco||Carretero, J||Castander, FJ||Costanzi, M||da Costa, LN||Desai, S||Diehl, HT||Doel, P||Flaugher, B||Foley, RJ||Garcia-Bellido, J||Gaztanaga, E||Gerdes, DW||Gruen, D||Gruendl, RA||Gschwend, J||Gutierrez, G||Hollowood, DL||Honscheid, K||Huterer, D||James, DJ||Kuehn, K||Kuropatkin, N||Lahav, O||Lima, M||Maia, MAG||Marshall, JL||Melchior, P||Menanteau, F||Miquel, R||Palmese, A||Plazas, AA||Romer, AK||Roodman, A||Sanchez, E||Scarpine, V||Schubnell, M||Serrano, S||Sevilla-Noarbe, I||Soares-Santos, M||Suchyta, E||Swanson, MEC||Tarle, G||Varga, TN||Walker, AR||Weller, J

publication date

  • August 2020