| Title: |
Characterizing the standardization properties of type ia supernovae in the z band with hierarchical Bayesian modelling |
| Authors: |
Hayes, EE; Dhawan, S; Mandel, KS; Jones, DO; Foley, RJ; Thorp, S; Grayling, M; Ward, SM; Do, A; Langeroodi, D; Earl, N; De Soto, KM; Narayan, G; Auchettl, K; De Boer, T; Chambers, KC; Coulter, DA; Gall, C; Gao, H; Izzo, L; Lin, CC; Magnier, EA; Rest, A; Wang, Q |
| Publisher Information: |
Oxford University Press (OUP) |
| Publication Year: |
2025 |
| Collection: |
The University of Melbourne: Digital Repository |
| Description: |
Type Ia supernovae (SNe Ia) are standardizable candles: their peak magnitudes can be corrected for correlations between light-curve properties and their luminosities to precisely estimate distances. Understanding SN Ia standardization across wavelength improves methods for correcting SN Ia magnitudes. Using 150 SNe Ia from the Foundation Supernova Survey and Young Supernova Experiment, we present the first study focusing on SN Ia standardization properties in the z band. Straddling the optical and near-infrared, SN Ia light in the z band is less sensitive to dust extinction and can be collected alongside the optical on CCDs. Pre-standardization, SNe Ia exhibit less residual scatter in z-band peak magnitudes than in the g and r bands. SNe Ia peak z-band magnitudes still exhibit a significant dependence on light-curve shape. Post-standardization, the z-band Hubble diagram has a total scatter of root mean square $=0.195$ mag. We infer a z-band mass step of $\gamma _{z} = -0.105 \pm 0.031$ mag, which is consistent within $1\sigma$ of that estimated from $gri$ data, assuming $R_{V} = 2.61$. When assuming different $R_{V}$ values for high and low mass host galaxies, the z band and optical mass steps remain consistent within $1\sigma$. Based on current statistical precision, these results suggest dust reddening cannot fully explain the mass step. SNe Ia in the z band exhibit complementary standardizability properties to the optical that can improve distance estimates. Understanding these properties is important for the upcoming Vera Rubin Observatory and Nancy G. Roman Space Telescope, which will probe the rest-frame z band to redshifts 0.1 and 1.8. |
| Document Type: |
article in journal/newspaper |
| Language: |
English |
| ISSN: |
0035-8711 |
| Relation: |
https://hdl.handle.net/11343/361794 |
| Availability: |
https://hdl.handle.net/11343/361794 |
| Rights: |
https://creativecommons.org/licenses/by/4.0 ; CC-BY |
| Accession Number: |
edsbas.41202FFC |
| Database: |
BASE |