Performance, and Supernova Spectroscopy First Cosmology Results using Supernovae Ia from the Dark Energy Survey: Survey Overview

Abstract We present details on the observing strategy, data-processing techniques, and spectroscopic targeting algorithms for the first three years of operation for the Dark Energy Survey Supernova Program (DES-SN). This five-year program using the Dark Energy Camera mounted on the 4 m Blanco telescope in Chile was designed to discover and follow supernovae (SNe) Ia over a wide redshift range (0.05<z<1.2) to measure the equation-of-state parameter of dark energy. We describe the SN program in full: strategy, observations, data reduction, spectroscopic follow-up observations, and classification. From three seasons of data, we have discovered 12,015 likely SNe, 308 of which have been spectroscopically confirmed, including 251 SNe Ia over a redshift range of 0.017<z<0.85. We determine the effective spectroscopic selection function for our sample and use it to investigate the redshift-dependent bias on the distance moduli of SNe Ia we have classified. The data presented here are used for the first cosmology analysis by DES-SN (DES-SN3YR), the results of which are given in Dark Energy Survey Collaboration et al. The 489 spectra that are used to define the DES-SN3YR sample are publicly available athttps://des.ncsa.illinois.edu/releases/sn.

Smith, M., D'Andrea, C. B., Sullivan, M., Moller, A., Nichol, R. C., Thomas, R. C., ... Wester, W.

Smith, M||D'Andrea, CB||Sullivan, M||Moller, A||Nichol, RC||Thomas, RC||Kim, AG||Sako, M||Castander, FJ||Filippenko, AV||Foley, RJ||Galbany, L||Gonzalez-Gaitan, S||Kasai, E||Kirshner, RP||Lidman, C||Scolnic, D||Brout, D||Davis, TM||Gupta, RR||Hinton, SR||Kessler, R||Lasker, J||Macaulay, E||Wolf, RC||Zhang, B||Asorey, J||Avelino, A||Bassett, BA||Calcino, J||Carollo, D||Casas, R||Challis, P||Childress, M||Clocchiatti, A||Crawford, S||Frohmaier, C||Glazebrook, K||Goldstein, DA||Graham, ML||Hoormann, JK||Kuehn, K||Lewis, GF||Mandel, KS||Morganson, E||Muthukrishna, D||Nugent, P||Pan, Y-C||Pursiainen, M||Sharp, R||Sommer, NE||Swann, E||Thomas, BP||Tucker, BE||Uddin, SA||Wiseman, P||Zheng, W||Abbott, TMC||Annis, J||Avila, S||Bechtol, K||Bernstein, GM||Bertin, E||Brooks, D||Burke, DL||Rosell, A Carnero||Kind, M Carrasco||Carretero, J||Cunha, CE||da Costa, LN||Davis, C||De Vicente, J||Diehl, HT||Eifler, TF||Estrada, J||Frieman, J||Garcia-Bellido, J||Gaztanaga, E||Gerdes, DW||Gruen, D||Gruendl, RA||Gschwend, J||Gutierrez, G||Hartley, WG||Hollowood, DL||Honscheid, K||Hoyle, B||James, DJ||Johnson, MWG||Johnson, MD||Kuropatkin, N||Li, TS||Lima, M||Maia, MAG||March, M||Marshall, JL||Martini, P||Menanteau, F||Miller, CJ||Miquel, R||Neilsen, E||Ogando, RLC||Plazas, AA||Romer, AK||Sanchez, E||Scarpine, V||Schubnell, M||Serrano, S||Sevilla-Noarbe, I||Soares-Santos, M||Sobreira, F||Suchyta, E||Tarle, G||Tucker, DL||Wester, W

First Cosmology Results using Supernovae Ia from the Dark Energy Survey: Survey Overview, Performance, and Supernova Spectroscopy Academic Article