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Supernova ejecta interacting with a circumstellar disk. I. two-dimensional radiation-hydrodynamic simulations
Akihiro Suzuki, Takashi J. Moriya, Tomoya Takiwaki
We perform a series of two-dimensional radiation-hydrodynamic simulations of the collision between supernova ejecta and circumstellar media (CSM). The hydrodynamic interaction of a…
iPTF14hls as a variable hyper-wind from a very massive star
Takashi J. Moriya, Paolo A. Mazzali, Elena Pian
The origin of iPTF14hls, which had Type IIP supernova-like spectra but kept bright for almost two years with little spectral evolution, is still unclear. We here propose that iPTF1…
A rapidly declining transient discovered with Subaru/Hyper Suprime-Cam
Nozomu Tominaga, Tomoki Morokuma, Masaomi Tanaka +14
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…
VTC J095517.5+690813: A radio transient from an accretion-induced collapse of a white dwarf?
Takashi J. Moriya
We investigate a possibility that a recently reported radio transient in M81, VTC J095517.5+690813, is caused by an accretion-induced collapse of a white dwarf. It became bright in…
Circumstellar properties of Type Ia supernovae from the helium star donor channel
Takashi J. Moriya, Dongdong Liu, Bo Wang +1
We investigate predicted circumstellar properties of Type Ia supernova progenitor systems with non-degenerate helium star donors. It has been suggested that systems consisting of a…
Observational signature of circumstellar interaction and Ni-mixing in the Type II Supernova 2016gfy
Avinash Singh, Brajesh Kumar, Takashi J. Moriya +5
The optical and ultra-violet broadband photometric and spectroscopic observations of the Type II supernova (SN) 2016gfy are presented. The -band light curve (LC) shows a distinc…
HSC16aayt: Slowly evolving interacting transient rising for more than 100 days
Takashi J. Moriya, Masaomi Tanaka, Tomoki Morokuma +19
We report our observations of HSC16aayt (SN 2016jiu), which was discovered by the Subaru/Hyper Suprime-Cam (HSC) transient survey conducted as part of Subaru Strategic Program (SSP…
Type IIn supernova light-curve properties measured from an untargeted survey sample
A. Nyholm, J. Sollerman, L. Tartaglia +19
We present a sample of supernovae Type IIn (SNe IIn) from the untargeted, magnitude-limited surveys of the Palomar Transient Factory (PTF) and its successor, the intermediate PTF (…
Fallback accretion powered supernova light curves based on a neutrino-driven explosion simulation of a 40 Msun star
Takashi J. Moriya, Bernhard Muller, Conrad Chan +2
We present synthetic light curves of fallback-powered supernovae based on a neutrino-driven explosion of a 40 Msun zero-metallicity star with significant fallback accretion onto a…
The Hyper Suprime-Cam SSP Transient Survey in COSMOS: Overview
Naoki Yasuda, Masaomi Tanaka, Nozomu Tominaga +18
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 ultra-deep layer and 5.…
SN 2017czd: A Rapidly Evolving Supernova from a Weak Explosion of a Type IIb Supernova Progenitor
Tatsuya Nakaoka, Takashi J. Moriya, Masaomi Tanaka +10
We present optical and near-infrared observations of the rapidly evolving supernova (SN) 2017czd that shows hydrogen features. The optical light curves exhibit a short plateau phas…
Gravity and Light: Combining Gravitational Wave and Electromagnetic Observations in the 2020s
R. J. Foley, K. D. Alexander, I. Andreoni +110
As of today, we have directly detected exactly one source in both gravitational waves (GWs) and electromagnetic (EM) radiation, the binary neutron star merger GW170817, its associa…
Searches for Population III Pair-Instability Supernovae: Impact of Gravitational Lensing Magnification
Kenneth C. Wong, Takashi J. Moriya, Masamune Oguri +3
Superluminous supernovae have been proposed to arise from Population III progenitors that explode as pair-instability supernovae. Pop III stars are the first generation of stars in…
Searches for Population III pair-instability supernovae: Predictions for ULTIMATE-Subaru and WFIRST
Takashi J. Moriya, Kenneth C. Wong, Yusei Koyama +4
ULTIMATE-Subaru (Ultra-wide Laser Tomographic Imager and MOS with AO for Transcendent Exploration on Subaru) and WFIRST (Wide Field Infra-Red Survey Telescope) are the next generat…
Probing the extragalactic fast transient sky at minute timescales with DECam
Igor Andreoni, Jeffrey Cooke, Sara Webb +22
Searches for optical transients are usually performed with a cadence of days to weeks, optimised for supernova discovery. The optical fast transient sky is still largely unexplored…
Synthetic spectra of energetic core-collapse supernovae and the early spectra of SN 2007bi and SN 1999as
Takashi J. Moriya, Paolo A. Mazzali, Masaomi Tanaka
SN 2007bi and SN 1999as are among the first superluminous supernovae discovered. SN 2007bi was suggested to be powered by the radioactive decay of a large amount (5 - 10 Msun) of 5…
The nature of PISN candidates: clues from nebular spectra
P. A. Mazzali, T. J. Moriya, M. Tanaka +1
A group of super-luminous supernovae (SL-SNe) characterised by broad light curves have been suggested to be Pair Instability SNe (PISNe). Nebular spectra computed using PISN models…
A Long-Duration Luminous Type IIn Supernova KISS15s: Strong Recombination Lines from the Inhomogeneous Ejecta-CSM Interaction Region and Hot Dust Emission from Newly Formed Dust
Mitsuru Kokubo, Kazuma Mitsuda, Tomoki Morokuma +7
We report the discovery of an SN1988Z-like type IIn supernova KISS15s found in a low-mass star-forming galaxy at redshift z=0.038 during the course of the Kiso Supernova Survey (KI…