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The Dark Energy Survey Supernova Program: Slow supernovae show cosmological time dilation out to $z \sim 1$

Fuente: arXiv

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Detalles Bibliográficos
Autores principales:	White, R. M. T., Davis, T. M., Lewis, G. F., Brout, D., Galbany, L., Glazebrook, K., Hinton, S. R., Lee, J., Lidman, C., Möller, A., Sako, M., Scolnic, D., Smith, M., Sullivan, M., Sánchez, B. O., Shah, P., Vincenzi, M., Wiseman, P., Abbott, T. M. C., Aguena, M., Allam, S., Andrade-Oliveira, F., Asorey, J., Bacon, D., Bocquet, S., Brooks, D., Buckley-Geer, E., Burke, D. L., Rosell, A. Carnero, Carollo, D., Carretero, J., da Costa, L. N., Pereira, M. E. S., De Vicente, J., Desai, S., Diehl, H. T., Everett, S., Ferrero, I., Flaugher, B., Frieman, J., García-Bellido, J., Gaztanaga, E., Giannini, G., Gruendl, R. A., Hollowood, D. L., Honscheid, K., James, D. J., Kessler, R., Kuehn, K., Lahav, O., Lee, S., Lima, M., Marshall, J. L., Mena-Fernández, J., Miquel, R., Myles, J., Nichol, R. C., Ogando, R. L. C., Palmese, A., Pieres, A., Malagón, A. A. Plazas, Romer, A. K., Sanchez, E., Cid, D. Sanchez, Schubnell, M., Suchyta, E., Tarle, G., Tucker, B. E., Walker, A. R., Weaverdyck, N.
Formato:	Preprint
Publicado:	2024
Materias:	Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena
Acceso en línea:	Acceder al recurso
Etiquetas:	Agregar Etiqueta Sin Etiquetas, Sea el primero en etiquetar este registro!

_version_	1866929465000460288
author	White, R. M. T. Davis, T. M. Lewis, G. F. Brout, D. Galbany, L. Glazebrook, K. Hinton, S. R. Lee, J. Lidman, C. Möller, A. Sako, M. Scolnic, D. Smith, M. Sullivan, M. Sánchez, B. O. Shah, P. Vincenzi, M. Wiseman, P. Abbott, T. M. C. Aguena, M. Allam, S. Andrade-Oliveira, F. Asorey, J. Bacon, D. Bocquet, S. Brooks, D. Buckley-Geer, E. Burke, D. L. Rosell, A. Carnero Carollo, D. Carretero, J. da Costa, L. N. Pereira, M. E. S. De Vicente, J. Desai, S. Diehl, H. T. Everett, S. Ferrero, I. Flaugher, B. Frieman, J. García-Bellido, J. Gaztanaga, E. Giannini, G. Gruendl, R. A. Hollowood, D. L. Honscheid, K. James, D. J. Kessler, R. Kuehn, K. Lahav, O. Lee, S. Lima, M. Marshall, J. L. Mena-Fernández, J. Miquel, R. Myles, J. Nichol, R. C. Ogando, R. L. C. Palmese, A. Pieres, A. Malagón, A. A. Plazas Romer, A. K. Sanchez, E. Cid, D. Sanchez Schubnell, M. Suchyta, E. Tarle, G. Tucker, B. E. Walker, A. R. Weaverdyck, N.
author_facet	White, R. M. T. Davis, T. M. Lewis, G. F. Brout, D. Galbany, L. Glazebrook, K. Hinton, S. R. Lee, J. Lidman, C. Möller, A. Sako, M. Scolnic, D. Smith, M. Sullivan, M. Sánchez, B. O. Shah, P. Vincenzi, M. Wiseman, P. Abbott, T. M. C. Aguena, M. Allam, S. Andrade-Oliveira, F. Asorey, J. Bacon, D. Bocquet, S. Brooks, D. Buckley-Geer, E. Burke, D. L. Rosell, A. Carnero Carollo, D. Carretero, J. da Costa, L. N. Pereira, M. E. S. De Vicente, J. Desai, S. Diehl, H. T. Everett, S. Ferrero, I. Flaugher, B. Frieman, J. García-Bellido, J. Gaztanaga, E. Giannini, G. Gruendl, R. A. Hollowood, D. L. Honscheid, K. James, D. J. Kessler, R. Kuehn, K. Lahav, O. Lee, S. Lima, M. Marshall, J. L. Mena-Fernández, J. Miquel, R. Myles, J. Nichol, R. C. Ogando, R. L. C. Palmese, A. Pieres, A. Malagón, A. A. Plazas Romer, A. K. Sanchez, E. Cid, D. Sanchez Schubnell, M. Suchyta, E. Tarle, G. Tucker, B. E. Walker, A. R. Weaverdyck, N.
contents	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 $Δt_{\rm em}$, and parameterising the observed duration as $Δt_{\rm obs}=Δt_{\rm em}(1+z)^b$, we fit for the form of time dilation using two methods. Firstly, we find that a power of $b \approx 1$ minimises 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 $b=1.003\pm0.005$ (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.
format	Preprint
id	arxiv_https___arxiv_org_abs_2406_05050
institution	arXiv
publishDate	2024
record_format	arxiv
spellingShingle	The Dark Energy Survey Supernova Program: Slow supernovae show cosmological time dilation out to $z \sim 1$ White, R. M. T. Davis, T. M. Lewis, G. F. Brout, D. Galbany, L. Glazebrook, K. Hinton, S. R. Lee, J. Lidman, C. Möller, A. Sako, M. Scolnic, D. Smith, M. Sullivan, M. Sánchez, B. O. Shah, P. Vincenzi, M. Wiseman, P. Abbott, T. M. C. Aguena, M. Allam, S. Andrade-Oliveira, F. Asorey, J. Bacon, D. Bocquet, S. Brooks, D. Buckley-Geer, E. Burke, D. L. Rosell, A. Carnero Carollo, D. Carretero, J. da Costa, L. N. Pereira, M. E. S. De Vicente, J. Desai, S. Diehl, H. T. Everett, S. Ferrero, I. Flaugher, B. Frieman, J. García-Bellido, J. Gaztanaga, E. Giannini, G. Gruendl, R. A. Hollowood, D. L. Honscheid, K. James, D. J. Kessler, R. Kuehn, K. Lahav, O. Lee, S. Lima, M. Marshall, J. L. Mena-Fernández, J. Miquel, R. Myles, J. Nichol, R. C. Ogando, R. L. C. Palmese, A. Pieres, A. Malagón, A. A. Plazas Romer, A. K. Sanchez, E. Cid, D. Sanchez Schubnell, M. Suchyta, E. Tarle, G. Tucker, B. E. Walker, A. R. Weaverdyck, N. Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena 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 $Δt_{\rm em}$, and parameterising the observed duration as $Δt_{\rm obs}=Δt_{\rm em}(1+z)^b$, we fit for the form of time dilation using two methods. Firstly, we find that a power of $b \approx 1$ minimises 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 $b=1.003\pm0.005$ (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.
title	The Dark Energy Survey Supernova Program: Slow supernovae show cosmological time dilation out to $z \sim 1$
topic	Cosmology and Nongalactic Astrophysics High Energy Astrophysical Phenomena
url	https://arxiv.org/abs/2406.05050