Type Ia Supernovae standardisation with the ZTF SN Ia DR2 sample

05 Nov 2024
Seminars and colloquia
Time
-
Venue
Beecroft Seminar Room
Denys Wilkinson Building, Department of Physics, University of Oxford, Keble Road, Oxford OX1 3RH
Speaker(s)

Madeleine Ginolin, IP2I Lyon

Seminar series
Cosmology
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Abstract

Type Ia Supernovae (SNe Ia) are the most common probes used to infer distances in current cosmological analyses. However, as their magnitude exhibits a natural scatter, SNe Ia need to be standardised in order to make the derived distance measurements accurate enough for cosmology. I will first introduce briefly SNe Ia and their use in cosmology. Secondly, I will present the ZTF survey and its DR2 Type Ia supernovae sample. With already more than 3,000 SNe Ia ready for cosmology, ZTF will be in future years the state-of-the-art low-redshift sample needed to anchor Stage IV supernovae surveys, e.g. LSST. I will finally present my work on the distributions of SNe Ia parameters (stretch and colour) and the standardisation relations found in ZTF, and how they depend on SNe Ia astrophysical environment.