S21A0147

We would like to conduct spectroscopic follow-up of 10 newly discovered HSC SSP SNeIa host galaxies in the framework of international collaboration. Type Ia Supernova is one of the most powerful probes to constrain the nature of dark energy. HSC SSP transient survey conducted from 2016 November to 2017 (Season I) has discovered 300 SNeIa and ∼60 SNe Ia at z>1 (photometric redshifts). In Sep 2019 - Mar 2020, HSC SSP transient survey (Season-II) has concluded on SXDS field, and HSC observation yielded similar number of SNe. We have sent the best 10 supernovae to the Hubble Space Telescope in Jan-Feb 2020. We propose spectroscopic follow-up observation of six host galaxies out of 10 newly discovered SN Ia host galaxies which are observed with WFC3 on HST as well as a few remaining spec-z measurement from Season-I. HST WFC3 observation enables us to perform accurate SN color measurement, and we are in need of getting spectroscopic redshift for cosmological analysis. This proposed observation is critical for the success of the HSC+HST SNIa cosmology project, and we expect to produce the most precise measurement of dark energy among many competitors. Our high-z SNeIa data set would remain unique in cosmological analysis.

This document was translated from L^AT_EX by H^EV^EA.