Reduction of the type Ia supernova host galaxy step in the outer regions of galaxies

ABSTRACT Using 1533 type Ia supernovae (SNe Ia) from the 5-yr sample of the Dark Energy Survey (DES), we investigate the relationship between the projected galactocentric separation of the SNe and their host galaxies and their light curves and standardization. We show, for the first time, that the difference in SN Ia post-standardization brightnesses between high- and low-mass hosts reduces from $0.078\pm 0.011$ mag in the full sample to $0.036 \pm 0.018$ mag for SNe Ia located in the outer regions of their host galaxies, while increasing to $0.100 \pm 0.014$ mag for SNe in the inner regions. The difference in the size of the mass step between inner and outer regions is $0.064\pm 0.023$ mag. In these inner regions, the step can be reduced (but not removed) using a model where the $R_V$ of dust along the line of sight to the SN changes as a function of galaxy properties. We investigate the remaining difference using the distributions of the SN Ia stretch parameter to test the inferred age of SN progenitors. Comparing red (older) environments only, outer regions have a higher proportion of high-stretch SNe and a more homogeneous stretch distribution. However, this effect cannot explain the reduction in significance of any Hubble residual step in outer regions. We conclude that the standardized distances of SNe Ia located in the outer regions of galaxies are less affected by their global host galaxy properties than those in the inner regions.

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Publication Details

Journal
Monthly Notices of the Royal Astronomical Society
Published
2025-02-18
DOI
https://doi.org/10.1093/mnras/staf248
Citations
2
Primary Topic
Gamma-ray bursts and supernovae
Type
article
Field-Weighted Citation Impact
2.31

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article

Reduction of the type Ia supernova host galaxy step in the outer regions of galaxies

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2 citations
Monthly Notices of the Royal Astronomical Society
Gamma-ray bursts and supernovae
2.31
article

Reduction of the type Ia supernova host galaxy step in the outer regions of galaxies

A. Pieres, B. Sánchez, S. Everett, I. Ferrero, S. R. Hinton, D. Brooks, A. Möller, L. Galbany, M. Gatti, J. Carretero, J. García-Bellido, D. Scolnic, J. L. Marshall, L. N. da Costa, G. Giannini, A Drlica-Wagner, R. Keßler, A. A. Plazas, Gregory Tarlé, E. Suchyta, A. Palmese, O. Alves, P. Wiseman, C. Tucker, P Shah, N. Weaverdyck, Gaston Gutierrez, D. Sanchez Cid, Eusebio Sanchez, Dillon Brout, J. Mena-Fernández, V. Vikram, A. Carnero Rosell, ENRIQUE GAZTAÑAGA, K. Honscheid, D L Hollowood, L Kelsey, M. Vincenzi, T. M. Davis, M. E. C. Swanson, H T Diehl, M. E. S. Pereira, Christopher E. Lidman, S. Desai, M. Aguena, C. Frohmaier, M. Toy, S Lee, B Popovic, M. Sullivan, O. Lahav, P. Doel, B. Flaugher, S Samuroff, D. James, Joshua A. Frieman, D. L. Burke, R A Gruendl, A. K. Romer, S Allam, A.R Walker, M. Smith, D. Bacon, J Lee, M Schubnell, R Miquel
article en
2 citations

Abstract

ABSTRACT Using 1533 type Ia supernovae (SNe Ia) from the 5-yr sample of the Dark Energy Survey (DES), we investigate the relationship between the projected galactocentric separation of the SNe and their host galaxies and their light curves and standardization. We show, for the first time, that the difference in SN Ia post-standardization brightnesses between high- and low-mass hosts reduces from $0.078\pm 0.011$ mag in the full sample to $0.036 \pm 0.018$ mag for SNe Ia located in the outer regions of their host galaxies, while increasing to $0.100 \pm 0.014$ mag for SNe in the inner regions. The difference in the size of the mass step between inner and outer regions is $0.064\pm 0.023$ mag. In these inner regions, the step can be reduced (but not removed) using a model where the $R_V$ of dust along the line of sight to the SN changes as a function of galaxy properties. We investigate the remaining difference using the distributions of the SN Ia stretch parameter to test the inferred age of SN progenitors. Comparing red (older) environments only, outer regions have a higher proportion of high-stretch SNe and a more homogeneous stretch distribution. However, this effect cannot explain the reduction in significance of any Hubble residual step in outer regions. We conclude that the standardized distances of SNe Ia located in the outer regions of galaxies are less affected by their global host galaxy properties than those in the inner regions.

Monthly Notices of the Royal Astronomical SocietyVol. 538(1)
Australian National University (AU), Institució Catalana de Recerca i Estudis Avançats (ES), California Institute of Technology (US), Argonne National Laboratory (US), Oak Ridge National Laboratory (US), Northeastern University (US), Centre National de la Recherche Scientifique (FR), Fermi National Accelerator Laboratory (US), Institute of Space Sciences (ES), Jet Propulsion Laboratory (US), Lawrence Berkeley National Laboratory (US), University of Illinois Urbana-Champaign (US), Universidad de La Laguna (ES), Universität Hamburg (DE), University of Sussex (GB), The University of Queensland (AU), Duke University (US), University of Oslo (NO), Institute for High Energy Physics (ES), University of Zurich (CH), Aix-Marseille Université (FR), University of Michigan (US), Lowell Observatory (US), Mitchell Institute (US), SLAC National Accelerator Laboratory (US), Australian Astronomical Observatory (AU), CEA Grenoble (FR), University of Oxford (GB), University of Chicago (US), Valongo Observatory (BR), Institut d'Estudis Espacials de Catalunya (ES), Einstein Institute of Science (IN), Kavli Institute for Particle Astrophysics and Cosmology (US), Center for Astrophysics Harvard & Smithsonian (US), National Observatory (BR), Instituto de Astrofísica de Canarias (ES), National Center for Supercomputing Applications (US), Cerro Tololo Inter-American Observatory (CL), Laboratoire de Physique Subatomique et de Cosmologie (FR), NSF NOIRLab (US), Laboratório Interinstitucional de e-Astronomia (BR), Centro de Investigaciones Energéticas, Medioambientales y Tecnológicas (ES), University of Southampton (GB), Institute of Science and Technology, University College London (GB), The Ohio State University (US), Swinburne University of Technology (AU), University of Portsmouth (GB), Universidad Autónoma de Madrid (ES), Indian Institute of Technology Hyderabad (IN), Lancaster University (GB), Carnegie Mellon University (US), University of Pennsylvania (US), Université Grenoble Alpes (FR), Texas A&M University (US), University of California, Berkeley (US), Stanford University (US), Macquarie University (AU)
National Science Foundation, U.S. Department of Energy, University of Pennsylvania, Ohio State University, University of Portsmouth, University College London, University of Sussex, Deutsche Forschungsgemeinschaft, Ministério da Ciência, Tecnologia e Inovação, Conselho Nacional de Desenvolvimento Científico e Tecnológico, Fundação Carlos Chagas Filho de Amparo à Pesquisa do Estado do Rio de Janeiro, Financiadora de Estudos e Projetos, Ministerio de Ciencia e Innovación, Institut de Física d'Altes Energies, University of Illinois at Urbana-Champaign, Science and Technology Facilities Council, Integrated Electronics Engineering Center, Binghamton University, Argonne National Laboratory, Fermilab, Lawrence Berkeley National Laboratory, SLAC National Accelerator Laboratory
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Gamma-ray bursts and supernovae
2.31
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