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The Supernova Legacy Survey 3-year sample: type Ia supernovae photometric distances and cosmological constraints

The Supernova Legacy Survey 3-year sample: type Ia supernovae photometric distances and cosmological constraints
The Supernova Legacy Survey 3-year sample: type Ia supernovae photometric distances and cosmological constraints
Aims. We present photometric properties and distance measurements of 252high redshift Type Ia supernovae (0.15 < z < 1.1) discovered during the first three years of the Supernova Legacy Survey (SNLS). These events were detected and their multi-colour light curves measured using the MegaPrime/MegaCam instrument at the Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degree fields in four bands. Follow-up spectroscopy was performed at the VLT, Gemini and Keck telescopes to confirm the nature of the supernovae and to measure their redshifts.

Methods. Systematic uncertainties arising from light curve modeling are studied, making use of two techniques to derive the peak magnitude, shape and colour of the supernovae, and taking advantage of a precise calibration of the SNLS fields.

Results. A flat ?CDM cosmological fit to 231SNLS high redshift type Ia supernovae alone gives ?M = 0.211 ± 0.034(stat) ± 0.069(sys). The dominant systematic uncertainty comes from uncertainties in the photometric calibration. Systematic uncertainties from light curve fitters come next with a total contribution of ± 0.026 on ?M. No clear evidence is found for a possible evolution of the slope (?) of the colour-luminosity relation with redshift.
supernovae, general, cosmology, observations
0004-6361
1-34
Guy, J.
988d8cfb-8a2c-4c9c-b316-6cfa562e00a3
Sullivan, Mark
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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.
333c3ee4-fd63-41b6-8660-2c7820cc63fe
Carlberg, R.
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Fouchez, D.
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Hardin, D.
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Hook, I.
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Howell, D.
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Pain, R.
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Palanque-Delabrouille, N.
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Perrett, K.
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Pritchet, C.
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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.
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Fabbro, S.
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Fakhouri, H.
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Fourmanoit, N.
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Gonzalez-Gaitan, S.
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Graham, M.
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Hsiao, E.
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Kronborg, T.
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Lidman, C.
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Mourao, A.
c2284f9d-e4cc-4d73-85d9-fe2d0c6d87ca
Perlmutter, S.
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Ripoche, P.
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Suzuki, N.
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Walker, E.
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Guy, J.
988d8cfb-8a2c-4c9c-b316-6cfa562e00a3
Sullivan, Mark
2f31f9fa-8e79-4b35-98e2-0cb38f503850
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.
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Fouchez, D.
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Hardin, D.
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Hook, I.
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Howell, D.
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Pain, R.
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Palanque-Delabrouille, N.
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Perrett, K.
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Pritchet, C.
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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.
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Fabbro, S.
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Fakhouri, H.
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Fourmanoit, N.
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Gonzalez-Gaitan, S.
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Graham, M.
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Hsiao, E.
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Kronborg, T.
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Lidman, C.
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Mourao, A.
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Perlmutter, S.
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Ripoche, P.
7bb7daef-3827-40bc-a584-ff31cce808b3
Suzuki, N.
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Walker, E.
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Guy, J., Sullivan, Mark, Conley, A., Regnault, N., Astier, P., Balland, C., Basa, S., Carlberg, R., Fouchez, D., Hardin, D., Hook, I., Howell, D., Pain, R., Palanque-Delabrouille, N., Perrett, K., Pritchet, C., Rich, J., Ruhlmann-Kleider, V., Balam, D., Baumont, S., Ellis, R., Fabbro, S., Fakhouri, H., Fourmanoit, N., Gonzalez-Gaitan, S., Graham, M., Hsiao, E., Kronborg, T., Lidman, C., Mourao, A., Perlmutter, S., Ripoche, P., Suzuki, N. and Walker, E. (2010) The Supernova Legacy Survey 3-year sample: type Ia supernovae photometric distances and cosmological constraints. Astronomy & Astrophysics, 523 (A7), 1-34. (doi:10.1051/0004-6361/201014468).

Record type: Article

Abstract

Aims. We present photometric properties and distance measurements of 252high redshift Type Ia supernovae (0.15 < z < 1.1) discovered during the first three years of the Supernova Legacy Survey (SNLS). These events were detected and their multi-colour light curves measured using the MegaPrime/MegaCam instrument at the Canada-France-Hawaii Telescope (CFHT), by repeatedly imaging four one-square degree fields in four bands. Follow-up spectroscopy was performed at the VLT, Gemini and Keck telescopes to confirm the nature of the supernovae and to measure their redshifts.

Methods. Systematic uncertainties arising from light curve modeling are studied, making use of two techniques to derive the peak magnitude, shape and colour of the supernovae, and taking advantage of a precise calibration of the SNLS fields.

Results. A flat ?CDM cosmological fit to 231SNLS high redshift type Ia supernovae alone gives ?M = 0.211 ± 0.034(stat) ± 0.069(sys). The dominant systematic uncertainty comes from uncertainties in the photometric calibration. Systematic uncertainties from light curve fitters come next with a total contribution of ± 0.026 on ?M. No clear evidence is found for a possible evolution of the slope (?) of the colour-luminosity relation with redshift.

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More information

Published date: November 2010
Keywords: supernovae, general, cosmology, observations
Organisations: Astronomy Group

Identifiers

Local EPrints ID: 356407
URI: https://eprints.soton.ac.uk/id/eprint/356407
ISSN: 0004-6361
PURE UUID: a7e0c6ae-6a4e-491c-ace1-e5683e6b9e1b
ORCID for Mark Sullivan: ORCID iD orcid.org/0000-0001-9053-4820

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Date deposited: 30 Sep 2013 10:27
Last modified: 06 Jun 2018 12:27

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Contributors

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

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