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The Effect of Environment on Type Ia Supernovae in the Dark Energy Survey Three-Year Cosmological Sample | | L. Kelsey
; M. Sullivan
; M. Smith
; P. Wiseman
; D. Brout
; T. M. Davis
; C. Frohmaier
; L. Galbany
; M. Grayling
; C. P. Gutiérrez
; S. R. Hinton
; R. Kessler
; C. Lidman
; A. Möller
; M. Sako
; D. Scolnic
; S. A. Uddin
; M. Vincenzi
; T. M. C. Abbott
; M. Aguena
; S. Allam
; J. Annis
; S. Avila
; D. Bacon
; E. Bertin
; D. Brooks
; D. L. Burke
; A. Carnero Rosell
; M. Carrasco Kind
; J. Carretero
; F. J. Castander
; M. Costanzi
; L. N. da Costa
; S. Desai
; H. T. Diehl
; P. Doel
; S. Everett
; I. Ferrero
; A. Ferté
; B. Flaugher
; P. Fosalba
; J. García-Bellido
; D. W. Gerdes
; D. Gruen
; R. A. Gruendl
; J. Gschwend
; G. Gutierrez
; D. L. Hollowood
; K. Honscheid
; D. J. James
; A. G. Kim
; K. Kuehn
; N. Kuropatkin
; O. Lahav
; M. Lima
; J. L. Marshall
; P. Martini
; F. Menanteau
; R. Miquel
; R. Morgan
; R. L. C. Ogando
; A. Palmese
; F. Paz-Chinchón
; A. A. Plazas
; A. K. Romer
; C. Sánchez
; E. Sanchez
; S. Serrano
; I. Sevilla-Noarbe
; E. Suchyta
; G. Tarle
; C. To
; T. N. Varga
; A. R. Walker
; R.D. Wilkinson
; | | Date: |
27 Aug 2020 | | Abstract: | Analyses of type Ia supernovae (SNe Ia) have found puzzling correlations
between their standardised luminosities and host galaxy properties: SNe Ia in
high-mass, passive hosts appear brighter than those in lower-mass, star-forming
hosts. We examine the host galaxies of SNe Ia in the Dark Energy Survey
three-year spectroscopically-confirmed cosmological sample, obtaining
photometry in a series of ’local’ apertures centred on the SN, and for the
global host galaxy. We study the differences in these host galaxy properties,
such as stellar mass and rest-frame $U-R$ colours, and their correlations with
SN Ia parameters including Hubble residuals. We find all Hubble residual steps
to be $>3sigma$ in significance, both for splitting at the traditional sample
median and for the step of maximum significance. For stellar mass, we find a
maximal local step of $0.098pm0.018$ mag; $sim 0.03$ mag greater than the
largest global stellar mass step in our sample ($0.070 pm 0.017$ mag). When
splitting at the sample median, differences between local and global $U-R$
steps are small, both $sim 0.08$ mag, but are more significant than the global
stellar mass step ($0.057pm0.017$ mag). We split the data into sub-samples
based on SN Ia light curve parameters: stretch ($x_1$) and colour ($c$),
finding that redder objects ($c > 0$) have larger Hubble residual steps, for
both stellar mass and $U-R$, for both local and global measurements, of
$sim0.14$ mag. Additionally, the bluer (star-forming) local environments host
a more homogeneous SN Ia sample, with local $U-R$ r.m.s. scatter as low as
$0.084 pm 0.017$ mag for blue ($c < 0$) SNe Ia in locally blue $U-R$
environments. | | Source: | arXiv, 2008.12101 | | Services: | Forum | Review | PDF | Favorites | |
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