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ZTF SN Ia DR2: An environmental study of Type Ia supernovae using host galaxy image decomposition

Journal Article · · Astronomy and Astrophysics
 [1];  [2];  [2];  [2];  [3];  [4];  [4];  [5];  [2];  [6];  [3];  [2];  [5];  [6];  [7];  [8];  [4];  [9];  [10];  [10] more »;  [10] « less
  1. Trinity College Dublin (Ireland); Max Planck Institut für Radioastronomie, Bonn (Germany)
  2. Trinity College Dublin (Ireland)
  3. Université Claude-Bernard Lyon 1 (UCBL) (France); Centre National de la Recherche Scientifique (CNRS) (France)
  4. Stockholm Univ. (Sweden)
  5. Lancaster Univ., Bailrigg (United Kingdom)
  6. Univ. Autonoma de Barcelona (Spain). Institute of Space Sciences (ICE, CSIC); Institut d'Estudis Espacials de Catalunya (IEEC), Barcelona (Spain)
  7. Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States); University of California, Berkeley, CA (United States)
  8. Université Clermont Auvergne (France); Centre National de la Recherche Scientifique (CNRS) (France)
  9. Trinity College Dublin (Ireland); Nordic Optical Telescope, Breña Baja (Spain)
  10. California Institute of Technology (CalTech), Pasadena, CA (United States)
+ Show Author Affiliations
The second data release of Type Ia supernovae (SNe Ia) observed by the Zwicky Transient Facility has provided a homogeneous sample of 3628 SNe Ia with photometric and spectral information. This unprecedented sample size enables us to better explore our currently tentative understanding of the dependence of the host environment on SN Ia properties. In this paper, we make use of two-dimensional image decomposition to model the host galaxies of SNe Ia. We model elliptical galaxies as well as disc and spiral galaxies with or without central bulges and bars. This allows for the categorisation of SN Ia based on their morphological host environment, as well as the extraction of intrinsic galaxy properties corrected for both cosmological and atmospheric effects, through point-spread-function (PSF) convolution. We find that although this image decomposition technique leads to a significant bias towards elliptical galaxies in our final sample of processed galaxies, the overall results are still robust. By successfully modelling 728 host galaxies, we find that the photometric properties of SNe Ia found in discs and in elliptical galaxies correlate fundamentally differently with their host environment. We identified strong linear relations between light-curve stretch and our model-derived galaxy colour for both the elliptical (16.8σ) and disc (5.1σ) subpopulations of SNe Ia. Lower-stretch SNe Ia are found in redder environments, which we identify as an age and/or metallicity effect. Within the subpopulation of SNe Ia found in disc-containing galaxies, we find a significant linear trend (6.1σ) between light-curve stretch and model-derived local r-band surface brightness, which we link to the age and metallicity gradients found in disc galaxies. SN Ia colour shows little correlation with the host environment, as is seen in the literature. We do identify a possible dust effect in our model-derived surface brightness (3.3σ) for SNe Ia in disc galaxies.
Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States). National Energy Research Scientific Computing Center (NERSC)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
2562812
Journal Information:
Astronomy and Astrophysics, Journal Name: Astronomy and Astrophysics Vol. 694; ISSN 0004-6361
Publisher:
EDP SciencesCopyright Statement
Country of Publication:
United States
Language:
English

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Related Subjects

79 ASTRONOMY AND ASTROPHYSICS
galaxies: fundamental parameters
supernovae: general
techniques: image processing