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 , K. Bechtol , G.M. Bernstein , E. Bertin (1) , 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. García-Bellido , E. Gaztanaga , T. Giannantonio , K. Glazebrook , D.A. Goldstein , S. González-Gaitán , 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. Möller , 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

1 IAP - Institut d'Astrophysique de Paris

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 ΛCDM model we find a matter density . 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 , and . For a flat w 0 w a CDM model, and combining probes from SN Ia, CMB and baryon acoustic oscillations, we find and . These results are in agreement with a cosmological constant and with previous constraints using SNe Ia (Pantheon, JLA).

Mots clés: dark energy; dark matter

Domaines: Astrophysique [astro-ph]

T.M.C. Abbott, S. Allam, P. Andersen, C. Angus, J. Asorey, et al.. First Cosmology Results using Type Ia Supernovae from the Dark Energy Survey: Constraints on Cosmological Parameters. Astrophys.J.Lett., 2019, 872 (2), pp.L30. ⟨10.3847/2041-8213/ab04fa⟩. ⟨hal-01937734⟩