First release of high-redshift superluminous supernovae from the Subaru HIgh-Z sUpernova CAmpaign (SHIZUCA). I. Photometric properties. (arXiv:1801.08240v2 [astro-ph.HE] UPDATED)

First release of high-redshift superluminous supernovae from the Subaru HIgh-Z sUpernova CAmpaign (SHIZUCA). I. Photometric properties. (arXiv:1801.08240v2 [astro-ph.HE] UPDATED)
<a href="http://arxiv.org/find/astro-ph/1/au:+Moriya_T/0/1/0/all/0/1">Takashi J. Moriya</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tanaka_M/0/1/0/all/0/1">Masaomi Tanaka</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yasuda_N/0/1/0/all/0/1">Naoki Yasuda</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Jiang_J/0/1/0/all/0/1">Ji-an Jiang</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lee_C/0/1/0/all/0/1">Chien-Hsiu Lee</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Maeda_K/0/1/0/all/0/1">Keiichi Maeda</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Morokuma_T/0/1/0/all/0/1">Tomoki Morokuma</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Nomoto_K/0/1/0/all/0/1">Ken'ichi Nomoto</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Quimby_R/0/1/0/all/0/1">Robert M. Quimby</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Suzuki_N/0/1/0/all/0/1">Nao Suzuki</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Takahashi_I/0/1/0/all/0/1">Ichiro Takahashi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tanaka_M/0/1/0/all/0/1">Masayuki Tanaka</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Tominaga_N/0/1/0/all/0/1">Nozomu Tominaga</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yamaguchi_M/0/1/0/all/0/1">Masaki Yamaguchi</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Bernard_S/0/1/0/all/0/1">Stephanie R. Bernard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Cooke_J/0/1/0/all/0/1">Jeff Cooke</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Curtin_C/0/1/0/all/0/1">Chris Curtin</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Galbany_L/0/1/0/all/0/1">Lluis Galbany</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Gonzalez_Gaitan_S/0/1/0/all/0/1">Santiago Gonzalez-Gaitan</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pignata_G/0/1/0/all/0/1">Giuliano Pignata</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Pritchard_T/0/1/0/all/0/1">Tyler Pritchard</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Komiyama_Y/0/1/0/all/0/1">Yutaka Komiyama</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Lupton_R/0/1/0/all/0/1">Robert H. Lupton</a>

We report our first discoveries of high-redshift supernovae from the Subaru
HIgh-Z sUpernova CAmpaign (SHIZUCA), the transient survey using Subaru/Hyper
Suprime-Cam. We report the discovery of three supernovae at the
spectroscopically-confirmed redshifts of 2.399 (HSC16adga), 1.965 (HSC17auzg),
and 1.851 (HSC17dbpf), and two supernova candidates with the host-galaxy
photometric redshifts of 3.2 (HSC16apuo) and 4.2 (HSC17dsid), respectively. In
this paper, we present their photometric properties and the spectroscopic
properties of the confirmed high-redshift supernovae are presented in the
accompanying paper (Curtin et al. 2019). The supernovae with the confirmed
redshifts of z ~ 2 have the rest ultraviolet peak magnitudes close to -21 mag
and they are likely superluminous supernovae. The discovery of three supernovae
at z ~ 2 roughly corresponds to the approximate event rate of ~ 900 +/- 520
Gpc-3 yr-1 with Poisson error, which is consistent with the total superluminous
supernova rate estimated by extrapolating the local rate based on the cosmic
star-formation history. Adding unconfirmed superluminous supernova candidates
would increase the event rate. Our superluminous supernova candidates at the
redshifts of around 3 and 4 indicate the approximate superluminous supernova
rates of ~ 400 +/- 400 Gpc-3 yr-1 (z ~ 3) and ~ 500 +/- 500 Gpc-3 yr-1 (z ~ 4)
with Poisson errors. Our initial results demonstrate the outstanding capability
of Hyper Suprime-Cam to discover high-redshift supernovae.

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