S18A0026

Type Ia Supernova is an one of powerful probes to constrain the nature of dark energy through the detailed, accurate, and unbiased measurement of the expansion history of the Universe. The existing and on-going observations of z<1 sample place strong constraints on ρDE(z) out to z∼1. At the redshift beyond z > 1, the current constraints have little statistical strength due to the lack of well-measured SNe Ia at this redshift. HSC is an unique instrument to effectively find SNe at this high redshift, and actually HSC SSP transient survey conducted from 2016 November to 2017 April has identified well sampled ∼60 SNe Ia at z>1 where the redshift come from host galaxies’ photometric redshifts. We propose here spectroscopic follow-up observation of ∼20 host galaxies of SN Ia candidates which are also observed with infrared camera (WFC3) on the HST measuring accurate SN color and as a result accurate distance. Our S16B and S17A proposals were accepted for the spectroscopy of live SNe and host galaxies but the weather was poor and telescope trouble has happened (only 1 night was usable out of 5 nights). This proposed observation is critical for the success of the HSC+HST SNIa cosmology project.


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