The Hyper Suprime-Cam SSP Transient Survey in COSMOS: Overview. (arXiv:1904.09697v1 [astro-ph.GA])

The Hyper Suprime-Cam SSP Transient Survey in COSMOS: Overview. (arXiv:1904.09697v1 [astro-ph.GA])
<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:+Tanaka_M/0/1/0/all/0/1">Masaomi 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:+Jiang_J/0/1/0/all/0/1">Ji-an Jiang</a>, <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:+Morokuma_T/0/1/0/all/0/1">Tomoki Morokuma</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:+Yamaguchi_M/0/1/0/all/0/1">Masaki S. Yamaguchi</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:+Sako_M/0/1/0/all/0/1">Masao Sako</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ikeda_S/0/1/0/all/0/1">Shiro Ikeda</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Kimura_A/0/1/0/all/0/1">Akisato Kimura</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Morii_M/0/1/0/all/0/1">Mikio Morii</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Ueda_N/0/1/0/all/0/1">Naonori Ueda</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Yoshida_N/0/1/0/all/0/1">Naoki Yoshida</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:+Suyu_S/0/1/0/all/0/1">Sherry H. Suyu</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:+Regnault_N/0/1/0/all/0/1">Nicolas Regnault</a>, <a href="http://arxiv.org/find/astro-ph/1/au:+Rubin_D/0/1/0/all/0/1">David Rubin</a>

We present an overview of a deep transient survey of the COSMOS field with
the Subaru Hyper Suprime-Cam (HSC). The survey was performed for the 1.77
deg$^2$ ultra-deep layer and 5.78 deg$^2$ deep layer in the Subaru Strategic
Program over 6- and 4-month periods from 2016 to 2017, respectively. The
ultra-deep layer shows a median depth per epoch of 26.4, 26.3, 26.0, 25.6, and
24.6 mag in $g$, $r$, $i$, $z$, and $y$ bands, respectively; the deep layer is
$sim0.6$ mag shallower. In total, 1,824 supernova candidates were identified.
Based on light curve fitting and derived light curve shape parameter, we
classified 433 objects as Type Ia supernovae (SNe); among these candidates, 129
objects have spectroscopic or COSMOS2015 photometric redshifts and 58 objects
are located at $z > 1$. Our unique dataset doubles the number of Type Ia SNe at
$z > 1$ and enables various time-domain analyses of Type II SNe, high redshift
superluminous SNe, variable stars, and active galactic nuclei.

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