Chang-Yi Chang (NCU); Yen-Chen Pan (NCU)
Type Ia Supernovae (SNe Ia) are standardizable candles which have been widely used to probe the cosmic expansion and nature of dark energy. However, the unknown progenitor systems complicate their usage in cosmology. Previous studies have shown that the host environment is closely related to the SN Ia luminosities, and this relation can be further used to reduce the scatter on the Hubble diagram. Here we investigate the relation between SNe Ia and their host galaxies using a large SN sample (~400 SNe Ia) discovered by the Pan-STARRS1 Medium Deep Survey (PS1 MDS). We will determine the host-galaxy properties, such as stellar mass, star-formation rate, metallicity and stellar age, using an advanced galaxy SED fitting script called “Prospector” (Johnson et al. 2019). Prospector will carefully estimate the above physical parameters by digesting the broad-band photometry of our host galaxies. In the future, we aim to connect these host parameters to the SN properties, and compare the derived relations to those from the local sample, to reveal (any) evolution with the redshift. This will be critical for us to pursue a high-precision cosmology.