The Hyper Suprime-Cam SSP Transient Survey in COSMOS: Overview

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 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 $\sim 0.6$ 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.

17 pages, 17 figures, accepted for publication in PASJ

References in corpus (19)

• Cosmic Star Formation History
• The Zwicky Transient Facility: System Overview, Performance, and First Results
• The Cosmic Evolution Survey (COSMOS) -- Overview
• The All-Sky Automated Survey for Supernovae (ASAS-SN) Light Curve Server v1.0
• 3D-HST WFC3-selected Photometric Catalogs in the Five CANDELS/3D-HST Fields: Photometry, Photometric Redshifts and Stellar Masses
• The type Ia supernova SNLS-03D3bb from a super-Chandrasekhar-mass white dwarf star
• The Sloan Digital Sky Survey-II Supernova Survey: Technical Summary
• Characterizing the V-band light-curves of hydrogen-rich type II supernovae
• Rapidly-Evolving and Luminous Transients from Pan-STARRS1
• The Subaru/XMM-Newton Deep Survey (SXDS) - II. Optical Imaging and Photometric Catalogs
• SN 2005ap: A Most Brilliant Explosion
• The Standardized Candle Method for Type II Plateau Supernovae
• Towards a Cosmological Hubble Diagram for Type II-P Supernovae
• Evryscope science: exploring the potential of all-sky gigapixel-scale telescopes
• Lyman-alpha Forest Tomography from Background Galaxies: The First Megaparsec-Resolution Large-Scale Structure Map at z>2
• Kiso Supernova Survey (KISS): Survey Strategy
• A Type II Supernova Hubble diagram from the CSP-I, SDSS-II, and SNLS surveys
• SN 2016jhj at redshift 0.34: extending the Type II supernova Hubble diagram using the standard candle method
• The Subaru/XMM-Newton Deep Survey (SXDS) - V. Optically Faint Variable Object Survey

Cited by in corpus (12)

• The Early Data Release of the Dark Energy Spectroscopic Instrument
• OzDES multi-object fibre spectroscopy for the Dark Energy Survey: Results and second data release
• Machine Learning for Observational Cosmology
• Light curve classification with recurrent neural networks for GOTO: dealing with imbalanced data
• Properties of AGN Multiband Optical Variability in the HSC SSP Transient Survey
• A systematic study on the rise time-peak luminosity relation for bright optical transients powered by wind shock breakout
• Prospects of Searching for Type Ia Supernovae with 2.5-m Wide Field Survey Telescope
• MUSSES2020J: The Earliest Discovery of a Fast Blue Ultraluminous Transient at Redshift 1.063
• Photometric classification of HSC transients using machine learning
• Type Ia Supernova Progenitor Properties and Their Host Galaxies
• Improving precision and accuracy in cosmology with model-independent spectrum and bispectrum
• The Compilation and Validation of the Spectroscopic Redshift Catalogs for the DESI-COSMOS and DESI-XMMLSS Fields