A rapidly declining transient discovered with Subaru/Hyper Suprime-Cam
arXiv:1909.03191 · doi:10.3847/1538-4357/ab425c
Abstract
We perform a high-cadence transient survey with Subaru Hyper Suprime-Cam (HSC), which we call the Subaru HSC survey Optimized for Optical Transients (SHOOT). We conduct HSC imaging observations with time intervals of about one hour on two successive nights, and spectroscopic and photometric follow-up observations. A rapidly declining blue transient SHOOT14di at is found in observations on two successive nights with an image subtraction technique. The rate of brightness change is () in the observer (rest) frame and the rest-frame color between and $4400~\unicode[.8,0]{x212B}$ is $M_{\rm 3400\unicode[.8,0]{x212B}}-M_{\rm 4400\unicode[.8,0]{x212B}}=-0.4$. The nature of the object is investigated by comparing its peak luminosity, decline rate, and color with those of transients and variables previously observed, and those of theoretical models. None of the transients or variables share the same properties as SHOOT14di. Comparisons with theoretical models demonstrate that, while the emission from the cooling envelope of a Type IIb supernova shows a slower decline rate than SHOOT14di, and the explosion of a red supergiant star with a dense circumstellar wind shows a redder color than SHOOT14di, the shock breakout at the stellar surface of the explosion of a red supergiant star with a small explosion energy of erg reproduces the multicolor light curve of SHOOT14di. This discovery shows that a high-cadence, multicolor optical transient survey at intervals of about one hour, and continuous and immediate follow-up observations, is important for studies of normal core-collapse supernovae at high redshifts.
17 pages, 11 figures. Accepted for publication in the Astrophysical Journal
References in corpus (33)
- Five-Year Wilkinson Microwave Anisotropy Probe (WMAP) Observations: Cosmological Interpretation
- Multi-messenger Observations of a Binary Neutron Star Merger
- Swope Supernova Survey 2017a (SSS17a), the Optical Counterpart to a Gravitational Wave Source
- The Electromagnetic Counterpart of the Binary Neutron Star Merger LIGO/VIRGO GW170817. II. UV, Optical, and Near-IR Light Curves and Comparison to Kilonova Models
- Spectroscopic identification of r-process nucleosynthesis in a double neutron star merger
- A kilonova as the electromagnetic counterpart to a gravitational-wave source
- The Zwicky Transient Facility: Science Objectives
- Light Curves of the Neutron Star Merger GW170817/SSS17a: Implications for R-Process Nucleosynthesis
- Illuminating Gravitational Waves: A Concordant Picture of Photons from a Neutron Star Merger
- Optical emission from a kilonova following a gravitational-wave-detected neutron-star merger
- Swift and NuSTAR observations of GW170817: detection of a blue kilonova
- The Combined Ultraviolet, Optical, and Near-Infrared Light Curves of the Kilonova Associated with the Binary Neutron Star Merger GW170817: Unified Data Set, Analytic Models, and Physical Implications
- The discovery of the electromagnetic counterpart of GW170817: kilonova AT 2017gfo/DLT17ck
- Confined Dense Circumstellar Material Surrounding a Regular Type II Supernova: The Unique Flash-Spectroscopy Event of SN 2013fs
- Rapidly-Evolving and Luminous Transients from Pan-STARRS1
- A Wolf-Rayet-like progenitor of supernova SN 2013cu from spectral observations of a wind
- Kepler Flares II: The Temporal Morphology of White-Light Flares on GJ 1243
- Theoretical light curves for deflagration models of Type Ia supernova
- Unifying Type II Supernova Light Curves with Dense Circumstellar Material
- Follow up of GW170817 and its electromagnetic counterpart by Australian-led observing programs
- J-GEM observations of an electromagnetic counterpart to the neutron star merger GW170817
- AGN Emission Line Diagnostics and the Mass-Metallicity Relation up to Redshift z~2: the Impact of Selection Effects and Evolution
- Photometric Redshift with Bayesian Priors on Physical Properties of Galaxies
- Absolute-Magnitude Distributions of Supernovae
- Supernova rates from the Southern inTermediate Redshift ESO Supernova Search (STRESS)
- Supernova Shock Breakout from a Red Supergiant
- Observations of the first electromagnetic counterpart to a gravitational wave source by the TOROS collaboration
- M Dwarfs in SDSS Stripe 82: Photometric Light Curves and Flare Rate Analysis
- Probing Shock Breakout with Serendipitous GALEX Detections of Two SNLS Type II-P Supernovae
- How Many Kilonovae Can Be Found in Past, Present, and Future Survey Datasets?
- LOSS Revisited - I: Unraveling correlations between supernova rates and galaxy properties, as measured in a reanalysis of the Lick Observatory Supernova Search
- The High Cadence Transient Survey (HiTS) - I. Survey design and supernova shock breakout constraints
- Kiso Supernova Survey (KISS): Survey Strategy