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First Cosmology Results Using Type Ia Supernovae From the Dark Energy Survey: Survey Overview and Supernova Spectroscopy

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arxiv 1811.09565 v1 pith:DRZVJIGW submitted 2018-11-23 astro-ph.CO

C. B. D'Andrea , M. Smith , M. Sullivan , R. C. Nichol , R. C. Thomas , A. G. Kim , A. Möller , M. Sako
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F. J. Castander A. V. Filippenko R. J. Foley L. Galbany S. González-Gaitán E. Kasai R. P. Kirshner C. Lidman D. Scolnic D. Brout T. M. Davis R. R. Gupta S. R. Hinton R. Kessler J. Lasker E. Macaulay R. C. Wolf B. Zhang J. Asorey A. Avelino B. A. Bassett J. Calcino D. Carollo R. Casas P. Challis M. Childress A. Clocchiatti S. Crawford K. Glazebrook D. A. Goldstein M. L. Graham J. K. Hoormann K. Kuehn G. F. Lewis K. S. Mandel E. Morganson D. Muthukrishna P. Nugent Y.-C. Pan M. Pursiainen R. Sharp N. E. Sommer E. Swann B. E. Tucker S. A. Uddin P. Wiseman W. Zheng T. M. C. Abbott J. Annis S. Avila K. Bechtol G. M. Bernstein E. Bertin D. Brooks D. L. Burke A. Carnero Rosell M. Carrasco Kind J. Carretero C. E. Cunha L. N. da Costa C. Davis J. De Vicente H. T. Diehl T. F. Eifler J. Estrada J. Frieman J. García-Bellido E. Gaztanaga D. W. Gerdes D. Gruen R. A. Gruendl J. Gschwend G. Gutierrez W. G. Hartley D. L. Hollowood K. Honscheid B. Hoyle D. J. James M. W. G. Johnson M. D. Johnson N. Kuropatkin T. S. Li M. Lima M. A. G. Maia J. L. Marshall P. Martini F. Menanteau C. J. Miller R. Miquel E. Neilsen R. L. C. Ogando A. A. Plazas A. K. Romer E. Sanchez V. Scarpine M. Schubnell S. Serrano I. Sevilla-Noarbe F. Sobreira E. Suchyta G. Tarle D. L. Tucker W. Wester (DES Collaboration)
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keywords firstsupernovaedatades-snsupernovasurveycosmologydark
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abstract

We present spectroscopy from the first three seasons of the Dark Energy Survey Supernova Program (DES-SN). We describe the supernova spectroscopic program in full: strategy, observations, data reduction, and classification. We have spectroscopically confirmed 307 supernovae, including 251 type Ia supernovae (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. We also provide a full overview of the strategy, observations, and data products of DES-SN, which has discovered 12,015 likely supernovae during these first three seasons. The data presented here are used for the first cosmology analysis by DES-SN ('DES-SN3YR'), the results of which are given in DES Collaboration (2018a).

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