First cosmology results using type Ia supernovae from the Dark Energy Survey: the effect of host galaxy properties on supernova luminosity

  title={First cosmology results using type Ia supernovae from the Dark Energy Survey: the effect of host galaxy properties on supernova luminosity},
  author={M. Smith and Mark Sullivan and Philip Wiseman and Richard Kessler and Dan Scolnic and Dillon Brout and Chris D'Andrea and Tamara M. Davis and Ryan J. Foley and Chris Frohmaier and Llu{\'i}s Galbany and R. Gupta and Claudia P. Guti'errez and Samuel R. Hinton and L Kelsey and Christopher E. Lidman and E Macaulay and Anais Moller and Robert Nichol and Peter E. Nugent and Antonella Palmese and Miika Pursiainen and Masao Sako and R. C. Thomas and Brad E. Tucker and Daniela Carollo and Geraint F. Lewis and Natalia E. Sommer and Timothy M. C. Abbott and Michel Aguena and Sahar Allam and Santiago {\'A}vila and Emmanuel Bertin and S. Bhargava and David Brooks and Elizabeth Buckley-Geer and David L. Burke and Aurelio Carnero Rosell and Matias Carrasco Kind and M. Costanzi and Luiz Nicolaci da Costa and Juan de Vicente and Shantanu Desai and H. Thomas Diehl and Peter Doel and T. F. Eifler and S. Everett and Brenna L. Flaugher and Pablo Fosalba and Joshua A. Frieman and Juan Garc'ia-Bellido and Enrique Gazta{\~n}aga and Karl Glazebrook and Daniel Gruen and Robert A. Gruendl and Julia Gschwend and Gaston R. Guti{\'e}rrez and William G. Hartley and Devon L. Hollowood and Klaus Honscheid and David J. James and E. Krause and Kyler W. Kuehn and Nikolay Kuropatkin and Marcos Lima and Niall MacCrann and Marcio A. G. Maia and Jennifer L. Marshall and Paul Martini and Peter Melchior and Felipe Menanteau and Ramon Miquel and F. Paz-Chinch'on and Andreas Alejandro Plazas and A. K. Romer and Aaron Roodman and Eli S. Rykoff and Eusebio S{\'a}nchez and Victor E. Scarpine and Michael S. Schubnell and Santiago Serrano and Ignacio Sevilla-Noarbe and Eric Suchyta and Mollye E. C. Swanson and Gregory G. Tarl{\'e} and D. Thomas and Douglas L. Tucker and T. N. Varga and Act Collaboration},
  journal={Monthly Notices of the Royal Astronomical Society},
We present improved photometric measurements for the host galaxies of 206 spectroscopically confirmed type Ia supernovae discovered by the Dark Energy Survey Supernova Program (DES-SN) and used in the first DES-SN cosmological analysis. For the DES-SN sample, when considering a 5D (z, x1, c, α, β) bias correction, we find evidence of a Hubble residual ‘mass step’, where SNe Ia in high-mass galaxies (>1010M⊙) are intrinsically more luminous (after correction) than their low-mass counterparts… 
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