4 years ago

First release of high-redshift superluminous supernovae from the Subaru HIgh-Z sUpernova CAmpaign (SHIZUCA). I. Photometric properties.

Takashi J. Moriya, Jeff Cooke, Ji-an Jiang, Naoki Yasuda, Lluis Galbany, Tomoki Morokuma, Yutaka Komiyama, Stephanie R. Bernard, Masaki Yamaguchi, Nao Suzuki, Ichiro Takahashi, Keiichi Maeda, Santiago Gonzalez-Gaitan, Chris Curtin, Robert H. Lupton, Masaomi Tanaka, Nozomu Tominaga, Ken'ichi Nomoto, Tyler Pritchard, Chien-Hsiu Lee, Giuliano Pignata, Robert M. Quimby, Masayuki Tanaka

We report our first discoveries of high-redshift supernovae from the Subaru HIgh-Z sUpernova CAmpaign (SHIZUCA), a transient survey using Subaru/Hyper Suprime-Cam. We report the discovery of three supernovae at spectroscopically-confirmed redshifts of 2.399 (HSC16adga), 1.965 (HSC17auzg), and 1.851 (HSC17dbpf), and two supernova candidates with 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. (2018). The supernovae with the confirmed redshifts of z ~ 2 have rest ultraviolet peak magnitudes of around -21 mag, which make them superluminous supernovae. The discovery of three supernovae at z ~ 2 roughly corresponds to an event rate of ~ 900 Gpc-3 yr-1, which is already 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 minimum superluminous supernova rates of ~ 400 Gpc-3 yr-1 (z ~ 3) and ~ 500 Gpc-3 yr-1 (z ~ 4). Because we have only performed a pilot search for high-redshift supernovae so far and have not completed selecting all the high-redshift supernova candidates, these rates are lower limits. Our initial results demonstrate the amazing capability of Hyper Suprime-Cam to discover high-redshift supernovae.

Publisher URL: http://arxiv.org/abs/1801.08240

DOI: arXiv:1801.08240v1

You might also like
Discover & Discuss Important Research

Keeping up-to-date with research can feel impossible, with papers being published faster than you'll ever be able to read them. That's where Researcher comes in: we're simplifying discovery and making important discussions happen. With over 19,000 sources, including peer-reviewed journals, preprints, blogs, universities, podcasts and Live events across 10 research areas, you'll never miss what's important to you. It's like social media, but better. Oh, and we should mention - it's free.

  • Download from Google Play
  • Download from App Store
  • Download from AppInChina

Researcher displays publicly available abstracts and doesn’t host any full article content. If the content is open access, we will direct clicks from the abstracts to the publisher website and display the PDF copy on our platform. Clicks to view the full text will be directed to the publisher website, where only users with subscriptions or access through their institution are able to view the full article.