"Cosmology with Type Ia Supernovae and the ZTF SN Ia DR2 sample"

par Madeleine Ginolin (IP2I/IN2P3/CNRS)

vendredi 24 janv. 2025, 14:30 → 15:30 Europe/Paris

Amphi Recherche (LPCA)

Type Ia Supernovae (SNe Ia) are a unique tool to measure distances in the Universe, as the peak luminosity of their explosion is always the same: objects appearing fainter are thus further away from us. Those distance measurements allow us to constrain the expansion rate of the Universe H0 and the dark energy equation of state parameter w. 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 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.

 

 

GINOLIN_LPCA_seminar.pdf