S20B0139abst

S20B0139

We would like to observe 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 just concluded on SXDS field, and HSC yields 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 several host galaxies out of 10 newly discovered SN Ia host galaxies which are observed with WFC3 on HST. HST WFC3 observation enables us to conduct 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.

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