arxiv: 1811.02374 · v4 · pith:MM6FGOL3new · submitted 2018-11-06 · 🌌 astro-ph.CO

First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: Constraints on Cosmological Parameters

T. M. C. Abbott , S. Allam , P. Andersen , C. Angus , J. Asorey , A. Avelino , S. Avila , B. A. Bassett

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K. Bechtol G. M. Bernstein E. Bertin D. Brooks D. Brout P. Brown D. L. Burke J. Calcino A. Carnero Rosell D. Carollo M. Carrasco Kind J. Carretero R. Casas F. J. Castander R. Cawthon P. Challis M. Childress A. Clocchiatti C. E. Cunha C. B. D'Andrea L. N. da Costa C. Davis T. M. Davis J. De Vicente D. L. DePoy S. Desai H. T. Diehl P. Doel A. Drlica-Wagner T. F. Eifler A. E. Evrard E. Fernandez A. V. Filippenko D. A. Finley B. Flaugher R. J. Foley P. Fosalba J. Frieman L. Galbany J. Garcia-Bellido E. Gaztanaga T. Giannantonio K. Glazebrook D. A. Goldstein S. Gonzalez-Gaitan D. Gruen R. A. Gruendl J. Gschwend R. R. Gupta G. Gutierrez W. G. Hartley S. R. Hinton D. L. Hollowood K. Honscheid J. K. Hoormann B. Hoyle D. J. James T. Jeltema M. W. G. Johnson M. D. Johnson E. Kasai S. Kent R. Kessler A. G. Kim R. P. Kirshner E. Kovacs E. Krause R. Kron K. Kuehn S. Kuhlmann N. Kuropatkin O. Lahav J. Lasker G. F. Lewis T. S. Li C. Lidman M. Lima H. Lin E. Macaulay M. A. G. Maia K. S. Mandel M. March J. Marriner J. L. Marshall P. Martini F. Menanteau C. J. Miller R. Miquel V. Miranda J. J. Mohr E. Morganson D. Muthukrishna A. M\"oller E. Neilsen R. C. Nichol B. Nord P. Nugent R. L. C. Ogando A. Palmese Y.-C. Pan A. A. Plazas M. Pursiainen A. K. Romer A. Roodman E. Rozo E. S. Rykoff M. Sako E. Sanchez V. Scarpine R. Schindler M. Schubnell D. Scolnic S. Serrano I. Sevilla-Noarbe R. Sharp M. Smith M. Soares-Santos F. Sobreira N. E. Sommer H. Spinka E. Suchyta M. Sullivan E. Swann G. Tarle D. Thomas R. C. Thomas M. A. Troxel B. E. Tucker S. A. Uddin A. R. Walker W. Wester P. Wiseman R. C. Wolf B. Yanny B. Zhang Y. Zhang (DES Collaboration)

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We present the first cosmological parameter constraints using measurements of type Ia supernovae (SNe Ia) from the Dark Energy Survey Supernova Program (DES-SN). The analysis uses a subsample of 207 spectroscopically confirmed SNe Ia from the first three years of DES-SN, combined with a low-redshift sample of 122 SNe from the literature. Our "DES-SN3YR" result from these 329 SNe Ia is based on a series of companion analyses and improvements covering SN Ia discovery, spectroscopic selection, photometry, calibration, distance bias corrections, and evaluation of systematic uncertainties. For a flat LCDM model we find a matter density Omega_m = 0.331 +_ 0.038. For a flat wCDM model, and combining our SN Ia constraints with those from the cosmic microwave background (CMB), we find a dark energy equation of state w = -0.978 +_ 0.059, and Omega_m = 0.321 +_ 0.018. For a flat w0waCDM model, and combining probes from SN Ia, CMB and baryon acoustic oscillations, we find w0 = -0.885 +_ 0.114 and wa = -0.387 +_ 0.430. These results are in agreement with a cosmological constant and with previous constraints using SNe Ia (Pantheon, JLA).

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