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First cosmology results using type Ia supernovae from the Dark Energy Survey: The effect of host galaxy properties on supernova luminosity

First cosmology results using type Ia supernovae from the Dark Energy Survey: The effect of host galaxy properties on supernova luminosity
First cosmology results using type Ia supernovae from the Dark Energy Survey: The effect of host galaxy properties on supernova luminosity
We present improved photometric measurements for the host galaxies of 206 spectroscopically confirmed type Ia supernovae discovered by the Dark Energy Survey Supernova Program (DES-SN) and used in the first DES-SN cosmological analysis. For the DES-SN sample, when considering a 5D (z, x1, c, α, β) bias correction, we find evidence of a Hubble residual 'mass step', where SNe Ia in high-mass galaxies (>1010M⊙) are intrinsically more luminous (after correction) than their low-mass counterparts by $\gamma =0.040\pm 0.019$ mag. This value is larger by 0.031 mag than the value found in the first DES-SN cosmological analysis. This difference is due to a combination of updated photometric measurements and improved star formation histories and is not from host-galaxy misidentification. When using a 1D (redshift-only) bias correction the inferred mass step is larger, with $\gamma =0.066\pm 0.020$ mag. The 1D-5D γ difference for DES-SN is $0.026\pm 0.009$ mag. We show that this difference is due to a strong correlation between host galaxy stellar mass and the x1 component of the 5D distance-bias correction. Including an intrinsic correlation between the observed properties of SNe Ia, stretch and colour, and stellar mass in simulated SN Ia samples, we show that a 5D fit recovers γ with -9 mmag bias compared to a +2 mmag bias for a 1D fit. This difference can explain part of the discrepancy seen in the data. Improvements in modelling correlations between galaxy properties and SN is necessary to ensure unbiased precision estimates of the dark energy equation of state as we enter the era of LSST.
surveys, supernovae: general, distance scale, cosmology: observations, transients: supernovae
1365-2966
4426-4447
Sullivan, M.
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Wiseman, P.
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Kessler, R.
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Scolnic, D.
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Brout, D.
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D'Andrea, C. B.
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Foley, R. J.
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Frohmaier, C.
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Galbany, L.
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Gupta, R. R.
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Gutiérrez, C. P.
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Hinton, S. R.
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Kelsey, L.
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Lidman, C.
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Macaulay, E.
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Thomas, R. C.
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Vincenzi, M.
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Carollo, D.
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Sommer, N. E.
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Aguena, M.
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Allam, S.
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Avila, S.
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Bertin, E.
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Bhargava, S.
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Buckley-Geer, E.
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Burke, D. L.
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Carnero Rosell, A.
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Carrasco Kind, M.
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Costanzi, M.
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da Costa, L. N.
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De Vicente, J.
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Desai, S.
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Diehl, H. T.
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Doel, P.
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Eifler, T. F.
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Everett, S.
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Flaugher, B.
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Fosalba, P.
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Frieman, J.
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García-Bellido, J.
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Gaztanaga, E.
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Glazebrook, K.
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The Dark Energy Survey Collaboration
Sullivan, M.
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Wiseman, P.
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Kessler, R.
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Scolnic, D.
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Brout, D.
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D'Andrea, C. B.
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Foley, R. J.
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Frohmaier, C.
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Galbany, L.
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Gupta, R. R.
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Gutiérrez, C. P.
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Hinton, S. R.
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Kelsey, L.
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Lidman, C.
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Macaulay, E.
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Möller, A.
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Nichol, R. C.
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Nugent, P.
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Palmese, A.
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Pursiainen, M.
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Sako, M.
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Swann, E.
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Thomas, R. C.
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Tucker, B. E.
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Vincenzi, M.
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Carollo, D.
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Sommer, N. E.
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Aguena, M.
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Allam, S.
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Avila, S.
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Bertin, E.
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Bhargava, S.
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Buckley-Geer, E.
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Burke, D. L.
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Carnero Rosell, A.
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Carrasco Kind, M.
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Costanzi, M.
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da Costa, L. N.
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De Vicente, J.
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Desai, S.
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Diehl, H. T.
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Doel, P.
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Eifler, T. F.
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Everett, S.
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Flaugher, B.
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Fosalba, P.
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Frieman, J.
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García-Bellido, J.
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Gaztanaga, E.
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Glazebrook, K.
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Sullivan, M., Wiseman, P., Kessler, R., Scolnic, D., Brout, D., D'Andrea, C. B., Foley, R. J., Frohmaier, C., Galbany, L., Gupta, R. R., Gutiérrez, C. P., Hinton, S. R., Kelsey, L., Lidman, C., Macaulay, E., Möller, A., Nichol, R. C., Nugent, P., Palmese, A., Pursiainen, M., Sako, M., Swann, E., Thomas, R. C., Tucker, B. E., Vincenzi, M., Carollo, D., Sommer, N. E., Aguena, M., Allam, S., Avila, S., Bertin, E., Bhargava, S., Buckley-Geer, E., Burke, D. L., Carnero Rosell, A., Carrasco Kind, M., Costanzi, M., da Costa, L. N., De Vicente, J., Desai, S., Diehl, H. T., Doel, P., Eifler, T. F., Everett, S., Flaugher, B., Fosalba, P., Frieman, J., García-Bellido, J., Gaztanaga, E. and Glazebrook, K. , The Dark Energy Survey Collaboration (2020) First cosmology results using type Ia supernovae from the Dark Energy Survey: The effect of host galaxy properties on supernova luminosity. Monthly Notices of the Royal Astronomical Society, 494 (3), 4426-4447. (doi:10.1093/mnras/staa946).

Record type: Article

Abstract

We present improved photometric measurements for the host galaxies of 206 spectroscopically confirmed type Ia supernovae discovered by the Dark Energy Survey Supernova Program (DES-SN) and used in the first DES-SN cosmological analysis. For the DES-SN sample, when considering a 5D (z, x1, c, α, β) bias correction, we find evidence of a Hubble residual 'mass step', where SNe Ia in high-mass galaxies (>1010M⊙) are intrinsically more luminous (after correction) than their low-mass counterparts by $\gamma =0.040\pm 0.019$ mag. This value is larger by 0.031 mag than the value found in the first DES-SN cosmological analysis. This difference is due to a combination of updated photometric measurements and improved star formation histories and is not from host-galaxy misidentification. When using a 1D (redshift-only) bias correction the inferred mass step is larger, with $\gamma =0.066\pm 0.020$ mag. The 1D-5D γ difference for DES-SN is $0.026\pm 0.009$ mag. We show that this difference is due to a strong correlation between host galaxy stellar mass and the x1 component of the 5D distance-bias correction. Including an intrinsic correlation between the observed properties of SNe Ia, stretch and colour, and stellar mass in simulated SN Ia samples, we show that a 5D fit recovers γ with -9 mmag bias compared to a +2 mmag bias for a 1D fit. This difference can explain part of the discrepancy seen in the data. Improvements in modelling correlations between galaxy properties and SN is necessary to ensure unbiased precision estimates of the dark energy equation of state as we enter the era of LSST.

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Accepted/In Press date: 29 March 2020
e-pub ahead of print date: 13 April 2020
Published date: 1 May 2020
Keywords: surveys, supernovae: general, distance scale, cosmology: observations, transients: supernovae
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Identifiers

Local EPrints ID: 470511
URI: http://eprints.soton.ac.uk/id/eprint/470511
DOI: doi:10.1093/mnras/staa946
ISSN: 1365-2966
PURE UUID: 1fccc0ae-3dd2-493f-8353-343b4beebeee
ORCID for M. Sullivan: ORCID iD orcid.org/0000-0001-9053-4820
ORCID for P. Wiseman: ORCID iD orcid.org/0000-0002-3073-1512

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Date deposited: 12 Oct 2022 16:41
Last modified: 17 Mar 2024 03:48

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Contributors

Author: M. Sullivan ORCID iD
Author: P. Wiseman ORCID iD
Author: R. Kessler
Author: D. Scolnic
Author: D. Brout
Author: C. B. D'Andrea
Author: R. J. Foley
Author: C. Frohmaier
Author: L. Galbany
Author: R. R. Gupta
Author: C. P. Gutiérrez
Author: S. R. Hinton
Author: L. Kelsey
Author: C. Lidman
Author: E. Macaulay
Author: A. Möller
Author: R. C. Nichol
Author: P. Nugent
Author: A. Palmese
Author: M. Pursiainen
Author: M. Sako
Author: E. Swann
Author: R. C. Thomas
Author: B. E. Tucker
Author: M. Vincenzi
Author: D. Carollo
Author: N. E. Sommer
Author: M. Aguena
Author: S. Allam
Author: S. Avila
Author: E. Bertin
Author: S. Bhargava
Author: E. Buckley-Geer
Author: D. L. Burke
Author: A. Carnero Rosell
Author: M. Carrasco Kind
Author: M. Costanzi
Author: L. N. da Costa
Author: J. De Vicente
Author: S. Desai
Author: H. T. Diehl
Author: P. Doel
Author: T. F. Eifler
Author: S. Everett
Author: B. Flaugher
Author: P. Fosalba
Author: J. Frieman
Author: J. García-Bellido
Author: E. Gaztanaga
Author: K. Glazebrook
Corporate Author: The Dark Energy Survey Collaboration

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