The Dark Energy Survey Supernova Program: slow supernovae show cosmological time dilation out to z ~ 1.

Author:

White R M T1ORCID,Davis T M1ORCID,Lewis G F2ORCID,Brout D3ORCID,Galbany L45ORCID,Glazebrook K6,Hinton S R1,Lee J7ORCID,Lidman C89ORCID,Möller A6ORCID,Sako M7,Scolnic D10ORCID,Smith M11ORCID,Sullivan M11ORCID,Sánchez B O1012ORCID,Shah P13ORCID,Vincenzi M1114ORCID,Wiseman P11ORCID,Abbott T M C15,Aguena M16,Allam S17ORCID,Andrade-Oliveira F1618,Asorey J19,Bacon D14,Bocquet S20ORCID,Brooks D13ORCID,Buckley-Geer E1721ORCID,Burke D L2223,Rosell A Carnero1624ORCID,Carollo D25,Carretero J26ORCID,da Costa L N16,Pereira M E S27,De Vicente J28ORCID,Desai S29ORCID,Diehl H T17ORCID,Everett S30,Ferrero I31,Flaugher B17ORCID,Frieman J1732ORCID,García-Bellido J33ORCID,Gaztanaga E4514ORCID,Giannini G2632ORCID,Gruendl R A3435,Hollowood D L36,Honscheid K3738ORCID,James D J3940ORCID,Kessler R2132ORCID,Kuehn K4142ORCID,Lahav O13ORCID,Lee S30,Lima M1643,Marshall J L44,Mena-Fernández J45ORCID,Miquel R2646ORCID,Myles J47,Nichol R C14,Ogando R L C48ORCID,Palmese A49ORCID,Pieres A1648ORCID,Malagón A A Plazas2223ORCID,Romer A K50ORCID,Sanchez E28ORCID,Cid D Sanchez28ORCID,Schubnell M51ORCID,Suchyta E52ORCID,Tarle G51ORCID,Tucker B E9,Walker A R15ORCID,Weaverdyck N5354,

Affiliation:

1. School of Mathematics and Physics, University of Queensland , Brisbane, QLD 4072 , Australia

2. Sydney Institute for Astronomy, School of Physics, A28, The University of Sydney, NSW 2006 , Australia

3. Center for Astrophysics|Harvard & Smithsonian , 60 Garden Street, Cambridge, MA 02138 , USA

4. Institut d’Estudis Espacials de Catalunya (IEEC) , E-08034 Barcelona , Spain

5. Institute of Space Sciences (ICE, CSIC), Campus UAB , Carrer de Can Magrans, s/n, E-08193 Barcelona , Spain

6. Centre for Astrophysics & Supercomputing, Swinburne University of Technology , Victoria 3122 , Australia

7. Department of Physics and Astronomy, University of Pennsylvania , Philadelphia, PA 19104 , USA

8. Centre for Gravitational Astrophysics, College of Science, The Australian National University , ACT 2601 , Australia

9. The Research School of Astronomy and Astrophysics, Australian National University , ACT 2601 , Australia

10. Department of Physics, Duke University, Durham , NC 27708 , USA

11. School of Physics and Astronomy, University of Southampton , Southampton SO17 1BJ , UK

12. Université Grenoble Alpes , CNRS, LPSC-IN2P3, F- 38000 Grenoble , France

13. Department of Physics & Astronomy, University College London , Gower Street, London WC1E 6BT , UK

14. Institute of Cosmology and Gravitation, University of Portsmouth , Portsmouth PO1 3FX , UK

15. Cerro Tololo Inter-American Observatory, NSF’s National Optical-Infrared Astronomy Research Laboratory , Casilla 603, La Serena , Chile

16. Laboratório Interinstitucional de e-Astronomia - LIneA , Rua Gal. José Cristino 77, Rio de Janeiro, RJ - 20921-400 , Brazil

17. Fermi National Accelerator Laboratory , P. O. Box 500, Batavia, IL 60510 , USA

18. Instituto de Física Teórica, Universidade Estadual Paulista , Sáo Paulo, 01140-070 , Brazil

19. Departamento de Física Teórica and Instituto de Física de Partículas y del Cosmos (IPARCOS-UCM), Universidad Complutense de Madrid , E- 28040 Madrid , Spain

20. University Observatory, Faculty of Physics, Ludwig-Maximilians-Universität , Scheinerstr. 1, D-81679 Munich , Germany

21. Department of Astronomy and Astrophysics, University of Chicago , Chicago, IL 60637 , USA

22. Kavli Institute for Particle Astrophysics & Cosmology , P. O. Box 2450, Stanford University, Stanford, CA 94305 , USA

23. SLAC National Accelerator Laboratory , Menlo Park, CA 94025 , USA

24. Instituto de Astrofisica de Canarias , E-38205 La Laguna , Tenerife, Spain

25. INAF-Osservatorio Astronomico di Trieste , via G. B. Tiepolo 11, I-34143 Trieste , Italy

26. Institut de Física d’Altes Energies (IFAE), The Barcelona Institute of Science and Technology , Campus UAB, E- 08193 Bellaterra (Barcelona), Spain

27. Hamburger Sternwarte, Universität Hamburg , Gojenbergsweg 112, D- 21029 Hamburg , Germany

28. Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (CIEMAT) , Madrid 28040 , Spain

29. Department of Physics, IIT Hyderabad , Kandi, Telangana 502285 , India

30. Jet Propulsion Laboratory, California Institute of Technology , 4800 Oak Grove Dr, Pasadena, CA 91109 , USA

31. Institute of Theoretical Astrophysics , University of Oslo. P.O. Box 1029 Blindern, NO-0315 Oslo , Norway

32. Kavli Institute for Cosmological Physics, University of Chicago , Chicago, IL 60637 , USA

33. Instituto de Fisica Teorica UAM/CSIC, Universidad Autonoma de Madrid , E-28049 Madrid , Spain

34. Center for Astrophysical Surveys, National Center for Supercomputing Applications , 1205 West Clark St, Urbana, IL 61801 , USA

35. Department of Astronomy, University of Illinois at Urbana-Champaign , 1002 W. Green Street, Urbana, IL 61801 , USA

36. Santa Cruz Institute for Particle Physics , Santa Cruz, CA 95064 , USA

37. Center for Cosmology and Astro-Particle Physics, The Ohio State University , Columbus, OH 43210 , USA

38. Department of Physics, The Ohio State University , Columbus, OH 43210 , USA

39. ASTRAVEO LLC , PO Box 1668, MA 01931 , USA

40. Applied Materials Inc. , 35 Dory Road, Gloucester, MA 01930 , USA

41. Australian Astronomical Optics, Macquarie University , North Ryde, NSW 2113 , Australia

42. Lowell Observatory , 1400 Mars Hill Rd, Flagstaff, AZ 86001 , USA

43. Departamento de Física Matemática, Instituto de Física, Universidade de São Paulo , CP 66318, São Paulo, SP 05314-970 , Brazil

44. George P. and Cynthia Woods Mitchell Institute for Fundamental Physics and Astronomy, and Department of Physics and Astronomy, Texas A&M University , College Station, TX 77843 , USA

45. LPSC Grenoble - 53 , Avenue des Martyrs, F-38026 Grenoble , France

46. Institució Catalana de Recerca i Estudis Avançats , E-08010 Barcelona , Spain

47. Department of Astrophysical Sciences, Princeton University , Peyton Hall, Princeton, NJ 08544 , USA

48. Observatório Nacional , Rua Gal. José Cristino 77, Rio de Janeiro, RJ - 20921-400 , Brazil

49. Department of Physics, Carnegie Mellon University , Pittsburgh, PA 15312 , USA

50. Department of Physics and Astronomy, Pevensey Building, University of Sussex , Brighton BN1 9QH , UK

51. Department of Physics, University of Michigan , Ann Arbor, MI 48109 , USA

52. Computer Science and Mathematics Division, Oak Ridge National Laboratory , Oak Ridge, TN 37831, USA

53. Department of Astronomy, University of California , Berkeley, 501 Campbell Hall, Berkeley, CA 94720 , USA

54. Lawrence Berkeley National Laboratory , 1 Cyclotron Road, Berkeley, CA 94720 , USA

Abstract

ABSTRACT We present a precise measurement of cosmological time dilation using the light curves of 1504 Type Ia supernovae from the Dark Energy Survey spanning a redshift range $0.1\lesssim z\lesssim 1.2$. We find that the width of supernova light curves is proportional to $(1+z)$, as expected for time dilation due to the expansion of the Universe. Assuming Type Ia supernovae light curves are emitted with a consistent duration $\Delta t_{\rm em}$, and parametrizing the observed duration as $\Delta t_{\rm obs}=\Delta t_{\rm em}(1+z)^b$, we fit for the form of time dilation using two methods. First, we find that a power of $b \approx 1$ minimizes the flux scatter in stacked subsamples of light curves across different redshifts. Secondly, we fit each target supernova to a stacked light curve (stacking all supernovae with observed bandpasses matching that of the target light curve) and find $b=1.003\pm 0.005$ (stat) $\pm \, 0.010$ (sys). Thanks to the large number of supernovae and large redshift-range of the sample, this analysis gives the most precise measurement of cosmological time dilation to date, ruling out any non-time-dilating cosmological models at very high significance.

Funder

Australian Research Council

U.S. Department of Energy

Science and Technology Facilities Council

Higher Education Funding Council for England

National Center for Supercomputing Applications

Center for Cosmology and AstroParticle Physics

Financiadora de Estudos e Projetos

Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro

Conselho Nacional de Desenvolvimento Científico e Tecnológico

Deutsche Forschungsgemeinschaft

National Science Foundation

MICINN

ERDF

European Union

Generalitat de Catalunya

European Research Council

CNPq

Publisher

Oxford University Press (OUP)

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