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SNLS3: Constraints on dark energy combining the supernova legacy survey three-year data with other probes

SNLS3: Constraints on dark energy combining the supernova legacy survey three-year data with other probes
SNLS3: Constraints on dark energy combining the supernova legacy survey three-year data with other probes
We present observational constraints on the nature of dark energy using the Supernova Legacy Survey three-year sample (SNLS3) of Guy et al. and Conley et al. We use the 472 Type Ia supernovae (SNe Ia) in this sample, accounting for recently discovered correlations between SN Ia luminosity and host galaxy properties, and include the effects of all identified systematic uncertainties directly in the cosmological fits. Combining the SNLS3 data with the full WMAP7 power spectrum, the Sloan Digital Sky Survey luminous red galaxy power spectrum, and a prior on the Hubble constant H 0 from SHOES, in a flat universe we find Ωm = 0.269 ± 0.015 and ω = –1.061+0.069 – 0.068 (where the uncertainties include all statistical and SN Ia systematic errors)—a 6.5% measure of the dark energy equation-of-state parameter w. The statistical and systematic uncertainties are approximately equal, with the systematic uncertainties dominated by the photometric calibration of the SN Ia fluxes—without these calibration effects, systematics contribute only a ~2% error in ω. When relaxing the assumption of flatness, we find Ωm = 0.271 ± 0.015, Ωk = –0.002 ± 0.006, and ω = –1.069+0.091– 0.092. Parameterizing the time evolution of ω as ω(a) = ω0 + ωa (1 – a) gives ω0 = –0.905 ± 0.196, ωa = –0.984+1.094 -1.097 in a flat universe. All of our results are consistent with a flat, ω = –1 universe. The size of the SNLS3 sample allows various tests to be performed with the SNe segregated according to their light curve and host galaxy properties. We find that the cosmological constraints derived from these different subsamples are consistent. There is evidence that the coefficient, β, relating SN Ia luminosity and color, varies with host parameters at >4σ significance (in addition to the known SN luminosity-host relation); however, this has only a small effect on the cosmological results and is currently a subdominant systematic.
0004-637X
102-121
Sullivan, M.
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Guy, J.
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Conley, A.
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Regnault, N.
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Astier, P.
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Balland, C.
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Basa, S.
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Carlberg, R.G.
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Fouchez, D.
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Hardin, D.
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Hook, I.M.
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Howell, D.A.
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Pain, R.
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Palanque-Delabrouille, N.
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Perrett, K.M.
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Pritchet, C.J.
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Rich, J.
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Ruhlmann-Kleider, V.
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Balam, D.
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Baumont, S.
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Ellis, R.S.
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Fabbro, S.
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Fakhouri, H.K.
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Fourmanoit, N.
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González-Gaitán, S.
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Graham, M.L.
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Hudson, M.J.
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Hsiao, E.
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Kronborg, T.
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Lidman, C.
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Mourao, A.M.
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Neill, J.D.
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Perlmutter, S.
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Ripoche, P.
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Suzuki, N.
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Walker, E.S.
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Sullivan, M.
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Guy, J.
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Conley, A.
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Regnault, N.
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Astier, P.
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Balland, C.
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Basa, S.
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Carlberg, R.G.
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Fouchez, D.
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Hardin, D.
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Hook, I.M.
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Howell, D.A.
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Pain, R.
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Palanque-Delabrouille, N.
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Pritchet, C.J.
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Rich, J.
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Ruhlmann-Kleider, V.
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Balam, D.
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Baumont, S.
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Ellis, R.S.
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Fabbro, S.
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Fakhouri, H.K.
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Fourmanoit, N.
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González-Gaitán, S.
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Graham, M.L.
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Hudson, M.J.
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Hsiao, E.
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Kronborg, T.
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Lidman, C.
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Mourao, A.M.
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Neill, J.D.
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Perlmutter, S.
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Ripoche, P.
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Suzuki, N.
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Walker, E.S.
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Sullivan, M., Guy, J., Conley, A., Regnault, N., Astier, P., Balland, C., Basa, S., Carlberg, R.G., Fouchez, D., Hardin, D., Hook, I.M., Howell, D.A., Pain, R., Palanque-Delabrouille, N., Perrett, K.M., Pritchet, C.J., Rich, J., Ruhlmann-Kleider, V., Balam, D., Baumont, S., Ellis, R.S., Fabbro, S., Fakhouri, H.K., Fourmanoit, N., González-Gaitán, S., Graham, M.L., Hudson, M.J., Hsiao, E., Kronborg, T., Lidman, C., Mourao, A.M., Neill, J.D., Perlmutter, S., Ripoche, P., Suzuki, N. and Walker, E.S. (2011) SNLS3: Constraints on dark energy combining the supernova legacy survey three-year data with other probes. The Astrophysical Journal, 737 (2), 102-121. (doi:10.1088/0004-637X/737/2/102).

Record type: Article

Abstract

We present observational constraints on the nature of dark energy using the Supernova Legacy Survey three-year sample (SNLS3) of Guy et al. and Conley et al. We use the 472 Type Ia supernovae (SNe Ia) in this sample, accounting for recently discovered correlations between SN Ia luminosity and host galaxy properties, and include the effects of all identified systematic uncertainties directly in the cosmological fits. Combining the SNLS3 data with the full WMAP7 power spectrum, the Sloan Digital Sky Survey luminous red galaxy power spectrum, and a prior on the Hubble constant H 0 from SHOES, in a flat universe we find Ωm = 0.269 ± 0.015 and ω = –1.061+0.069 – 0.068 (where the uncertainties include all statistical and SN Ia systematic errors)—a 6.5% measure of the dark energy equation-of-state parameter w. The statistical and systematic uncertainties are approximately equal, with the systematic uncertainties dominated by the photometric calibration of the SN Ia fluxes—without these calibration effects, systematics contribute only a ~2% error in ω. When relaxing the assumption of flatness, we find Ωm = 0.271 ± 0.015, Ωk = –0.002 ± 0.006, and ω = –1.069+0.091– 0.092. Parameterizing the time evolution of ω as ω(a) = ω0 + ωa (1 – a) gives ω0 = –0.905 ± 0.196, ωa = –0.984+1.094 -1.097 in a flat universe. All of our results are consistent with a flat, ω = –1 universe. The size of the SNLS3 sample allows various tests to be performed with the SNe segregated according to their light curve and host galaxy properties. We find that the cosmological constraints derived from these different subsamples are consistent. There is evidence that the coefficient, β, relating SN Ia luminosity and color, varies with host parameters at >4σ significance (in addition to the known SN luminosity-host relation); however, this has only a small effect on the cosmological results and is currently a subdominant systematic.

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Published date: 8 August 2011
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 350440
URI: https://eprints.soton.ac.uk/id/eprint/350440
ISSN: 0004-637X
PURE UUID: 4d4ece3b-e683-4ab0-a922-d29e9f9d87ae
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 04 Apr 2013 11:59
Last modified: 10 Jul 2018 00:30

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Contributors

Author: M. Sullivan ORCID iD
Author: J. Guy
Author: A. Conley
Author: N. Regnault
Author: P. Astier
Author: C. Balland
Author: S. Basa
Author: R.G. Carlberg
Author: D. Fouchez
Author: D. Hardin
Author: I.M. Hook
Author: D.A. Howell
Author: R. Pain
Author: N. Palanque-Delabrouille
Author: K.M. Perrett
Author: C.J. Pritchet
Author: J. Rich
Author: V. Ruhlmann-Kleider
Author: D. Balam
Author: S. Baumont
Author: R.S. Ellis
Author: S. Fabbro
Author: H.K. Fakhouri
Author: N. Fourmanoit
Author: S. González-Gaitán
Author: M.L. Graham
Author: M.J. Hudson
Author: E. Hsiao
Author: T. Kronborg
Author: C. Lidman
Author: A.M. Mourao
Author: J.D. Neill
Author: S. Perlmutter
Author: P. Ripoche
Author: N. Suzuki
Author: E.S. Walker

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