The Hyper Suprime-Cam SSP transient survey in COSMOS: Overview

Author:

Yasuda Naoki1,Tanaka Masaomi12,Tominaga Nozomu13,Jiang Ji-an4,Moriya Takashi J5,Morokuma Tomoki14,Suzuki Nao1,Takahashi Ichiro16,Yamaguchi Masaki S3,Maeda Keiichi17,Sako Masao8,Ikeda Shiro19,Kimura Akisato10,Morii Mikio9,Ueda Naonori10,Yoshida Naoki1611,Lee Chien-Hsiu12,Suyu Sherry H1314,Komiyama Yutaka515,Regnault Nicolas16,Rubin David1718

Affiliation:

1. Kavli Institute for the Physics and Mathematics of the Universe (WPI), The University of Tokyo Institutes for Advanced Study, The University of Tokyo, 5-1-5 Kashiwanoha, Kashiwa, Chiba 277-8583, Japan

2. Astronomical Institute, Tohoku University, Aoba, Sendai, Miyagi 980-8578, Japan

3. Department of Physics, Faculty of Science and Engineering, Konan University, 8-9-1 Okamoto, Kobe, Hyogo 658-8501, Japan

4. Institute of Astronomy, Graduate School of Science, The University of Tokyo, 2-21-1 Osawa, Mitaka, Tokyo 181-0015, Japan

5. National Astronomical Observatory of Japan, National Institutes of Natural Sciences, 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

6. CREST, JST, 4-1-8 Honcho, Kawaguchi, Saitama 332-0012, Japan

7. Department of Astronomy, Kyoto University, Kitashirakawa-Oiwake-cho, Sakyo-ku, Kyoto, Kyoto 606-8502, Japan

8. Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, PA 19104, USA

9. Research Center for Statistical Machine Learning, The Institute of Statistical Mathematics, 10-3 Midori-cho, Tachikawa, Tokyo 190-8562, Japan

10. NTT Communication Science Laboratories, 2-4 Hikaridai, Seika-cho, Keihanna Science City, Kyoto, Kyoto 619-0237, Japan

11. Department of Physics, Graduate School of Science, The University of Tokyo, 7-3-1 Hongo, Bunkyo-ku, Tokyo 113-0033, Japan

12. Subaru Telescope, National Astronomical Observatory of Japan, 650 N A’ohoku Pl., Hilo, HI 96720, USA

13. Max-Planck-Institut für Astrophysik, Karl-Schwarzschild-Str. 1, 85748 Garching, Germany

14. Physik-Department, Technische Universität München, James-Franck-Straße 1, 85748 Garching, Germany

15. Graduate University for Advanced Studies (SOKENDAI), 2-21-1 Osawa, Mitaka, Tokyo 181-8588, Japan

16. Sorbonne Université, Université Paris Diderot, CNRS/IN2P3, Laboratoire de Physique Nucléaire et de Hautes Energies, LPNHE, 4 Place Jussieu, 75252 Paris, France

17. Physics Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road, Berkeley, CA 94720, USA

18. Space Telescope Science Institute, 3700 San Martin Drive, Baltimore, MD 21218, USA

Abstract

Abstract 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 deg2 ultra-deep layer and 5.78 deg2 deep layer in the Subaru Strategic Program over six- and four-month periods from 2016 to 2017, respectively. The ultra-deep layer reaches 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 ∼0.6 mag shallower. In total, 1824 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 data set 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.

Funder

National Aeronautics and Space Administration

National Science Foundation

CREST

MEXT

JSPS

Publisher

Oxford University Press (OUP)

Subject

Space and Planetary Science,Astronomy and Astrophysics

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