S18A0034abst
S18A0034
We propose spectroscopic follow-up observations of high-redshift superluminous supernova (SLSN) candidates at z>sim 2 found by the HSC transient survey that will be conducted at the COSMOS field from Dec 2017 (S17B-0551, PI: N. Suzuki). A transient survey was performed in the COSMOS field in the last winter as a part of SSP and it allowed us to discover 3 spectroscopically-confirmed SLSNe at zβΌ 2, including the highest-redshift record of z=2.399. Many more supernova (SN) candidates at z>sim2, with the highest-redshift candidate at zβΌ4.2, were found but their spectra were not taken. The extra survey at the same field not only allows us to discover more SLSNe at z>sim2 but also look for slowly-evolving high redshift SLSNe that continue to exist from the transient survey conducted one year before. Confirmation of their redshifts and spectral types will enable us to investigate the SLSN rate at high redshifts with which we can directly investigate the massive star formation at z>sim 2. We can also estimate the high-redshift SLSN rates of the different SLSN subtypes which will be helpful to obtain a better understanding of their progenitors. The spectroscopically confirmed SLSNe may also be used as distance indicators to construct the Hubble diagram.
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