The dependence of the Type Ia Supernova colour-luminosity relation on their host galaxy properties
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arXiv
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2025
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| author | Ramaiya, S. Vincenzi, M. Jarvis, M. J. Wiseman, P. Sullivan, M. |
| author_facet | Ramaiya, S. Vincenzi, M. Jarvis, M. J. Wiseman, P. Sullivan, M. |
| contents | Using the Dark Energy Survey 5-year sample, we determine the properties of type Ia supernova (SN Ia) host galaxies across a wide multi-wavelength range - from the optical to far-infrared - including data from the $Herschel$ and $Spitzer$ space telescopes. We categorise the SNe Ia into three distinct groups according to the distribution of their host galaxies on the star-formation rate (SFR) - stellar mass ($M_\star$) plane. Each region comprises host galaxies at distinct stages in their evolutionary pathways: Region 1 - low-mass hosts; Region 2 - high-mass, star-forming hosts and Region 3 - high-mass, passive hosts. We find SNe Ia in host galaxies located in Region 1 have the steepest slope (quantified by $β$) between their colours and luminosities, with $β_{\mathrm{R_1}} = 3.51 \pm 0.16$. This differs at the ${\sim}6σ$ significance level to SNe Ia in Region 3, which have the shallowest colour-luminosity slope with $β_{\mathrm{R_3}} = 2.12 \pm 0.16$. After correcting SNe Ia in each subsample by their respective $β$, events in Region 3 (high-mass, passive hosts) are $0.07 - 0.12$ mag ($>3σ$) brighter, post-standardisation. We conclude that future cosmological analyses should apply standardisation relations to SNe Ia based upon the region in which the SN host galaxy lies in the SFR-$M_\star$ plane. Alternatively, cosmological analyses should restrict the SN Ia sample to events whose host galaxies occupy a single region of this plane. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2509_12035 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | The dependence of the Type Ia Supernova colour-luminosity relation on their host galaxy properties Ramaiya, S. Vincenzi, M. Jarvis, M. J. Wiseman, P. Sullivan, M. Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics Using the Dark Energy Survey 5-year sample, we determine the properties of type Ia supernova (SN Ia) host galaxies across a wide multi-wavelength range - from the optical to far-infrared - including data from the $Herschel$ and $Spitzer$ space telescopes. We categorise the SNe Ia into three distinct groups according to the distribution of their host galaxies on the star-formation rate (SFR) - stellar mass ($M_\star$) plane. Each region comprises host galaxies at distinct stages in their evolutionary pathways: Region 1 - low-mass hosts; Region 2 - high-mass, star-forming hosts and Region 3 - high-mass, passive hosts. We find SNe Ia in host galaxies located in Region 1 have the steepest slope (quantified by $β$) between their colours and luminosities, with $β_{\mathrm{R_1}} = 3.51 \pm 0.16$. This differs at the ${\sim}6σ$ significance level to SNe Ia in Region 3, which have the shallowest colour-luminosity slope with $β_{\mathrm{R_3}} = 2.12 \pm 0.16$. After correcting SNe Ia in each subsample by their respective $β$, events in Region 3 (high-mass, passive hosts) are $0.07 - 0.12$ mag ($>3σ$) brighter, post-standardisation. We conclude that future cosmological analyses should apply standardisation relations to SNe Ia based upon the region in which the SN host galaxy lies in the SFR-$M_\star$ plane. Alternatively, cosmological analyses should restrict the SN Ia sample to events whose host galaxies occupy a single region of this plane. |
| title | The dependence of the Type Ia Supernova colour-luminosity relation on their host galaxy properties |
| topic | Astrophysics of Galaxies Cosmology and Nongalactic Astrophysics |
| url | https://arxiv.org/abs/2509.12035 |