1.1k citations · 7.8k across the 150 of their papers we have counts for
151 papers
Properties of the circumstellar matter around the pair-instability supernova candidate SN 2018ibb revealed by its light curve
Takashi J. Moriya, Steve Schulze, Alexander Heger +2
SN 2018ibb is one of the best pair-instability supernova (PISN) candidates identified to date. It, however, showed unexpected blue flux excess in late-phase spectra, likely origina…
Can Little Red Dots Contribute To The Early Universe Cosmic Dust Budget?
Chris Ashall, Rohan P. Naidu, Alberto Torralba +11
The origin of dust in the early Universe remains uncertain. We explore whether Little Red Dots (LRDs) could provide a high-redshift dust-production channel. Motivated by an analogy…
Type Ibn supernovae from ultra-stripped supernova progenitors
Takashi J. Moriya, Bernhard Mueller, Sergei I. Blinnikov +4
Ultra-stripped supernovae are core-collapse supernovae from progenitors that lose a significant fraction of mass because of the binary interactions with their compact companion sta…
Radio Follow-up Observations of SN 2023ixf by Japanese and Korean VLBIs
Yuhei Iwata, Masanori Akimoto, Tomoki Matsuoka +10
We report on radio follow-up observations of the nearby Type II supernova, SN 2023ixf, spanning from 1.7 to 269.9 days after the explosion, conducted using three very long baseline…
A systematic search for rapid transients in the Subaru HSC-SSP transient survey
Seiji Toshikage, Masaomi Tanaka, Naoki Yasuda +9
Recent high-cadence transient surveys have discovered rapid transients whose light curve timescales are shorter than those of typical supernovae. In this paper, we present a system…
A Robust Light-Curve Diagnostic for Electron-Capture Supernovae and Low-Mass Fe-Core-Collapse Supernovae
Masato Sato, Nozomu Tominaga, Sergei I. Blinnikov +3
Core-collapse supernovae (CCSNe) are the terminal explosions of massive stars. While most massive stars explode as iron-core-collapse supernovae (FeCCSNe), slightly less massive st…
Bridging between type IIb and Ib supernovae: SN IIb 2022crv with a very thin Hydrogen envelope
Anjasha Gangopadhyay, Keiichi Maeda, Avinash Singh +26
We present optical, near-infrared, and radio observations of supernova (SN) SN~IIb 2022crv. We show that it retained a very thin H envelope and transitioned from a SN~IIb to a SN~I…
Unprecedented early flux excess in the hybrid 02es-like type Ia supernova 2022ywc indicates interaction with circumstellar material
Shubham Srivastav, T. Moore, M. Nicholl +20
We present optical photometric and spectroscopic observations of the 02es-like type Ia supernova (SN) 2022ywc. The transient occurred in the outskirts of an elliptical host galaxy…
Constraint on the event rate of general relativistic instability supernovae from the early JWST deep field data
Takashi J. Moriya, Yuichi Harikane, Akio K. Inoue
General relativistic instability supernovae at ~10 < z < ~15 are predicted to be observed as red faint point sources, and they can be detected only in the reddest filters in JWST/N…
On the nature of slowly rising interaction-powered supernovae
Takashi J. Moriya
Some interaction-powered supernovae have long rise times of more than 100 days. We show that such long rise times are naturally expected if circumstellar matters (CSM) have a flat…
Enabling Kilonova Science with Nancy Grace Roman Space Telescope
Igor Andreoni, Michael W. Coughlin, Alexander W. Criswell +16
Binary neutron star mergers and neutron star-black hole mergers are multi-messenger sources that can be detected in gravitational waves and in electromagnetic radiation. The low el…
Roman CCS White Paper: Characterizing Superluminous Supernovae with Roman
Sebastian Gomez, Kate Alexander, Edo Berger +16
Type-I Superluminous Supernovae (SLSNe) are an exotic class of core-collapse SN (CCSN) that can be up to 100 times brighter and more slowly-evolving than normal CCSNe. SLSNe repres…
Roman CCS White Paper: Identifying high-redshift pair-instability supernovae by adding sparse F213 filter observations
Takashi Moriya, Ori D. Fox, Robert Quimby +22
Pair-instability supernovae (PISNe) are explosions of very massive stars that may have played a critical role in the chemical evolution and reionization of the early Universe. In o…
Environmental dependence of Type IIn supernova properties
Takashi J. Moriya, Lluis Galbany, Cristina Jimenez-Palau +9
Type IIn supernovae occur when stellar explosions are surrounded by dense hydrogen-rich circumstellar matter. The dense circumstellar matter is likely formed by extreme mass loss f…
Impacts of the reaction rate on nucleosynthesis in pair-instability supernovae
Hiroki Kawashimo, Ryo Sawada, Yudai Suwa +3
Nuclear reactions are key to our understanding of stellar evolution, particularly the rate, which is known to significantly influence the…
GREX-PLUS Science Book
PLUS Science Team, Akio K. Inoue, Yuichi Harikane +28
GREX-PLUS (Galaxy Reionization EXplorer and PLanetary Universe Spectrometer) is a mission candidate for a JAXA's strategic L-class mission to be launched in the 2030s. Its primary…
Early excess emission in Type Ia supernovae from the interaction between supernova ejecta and their circumstellar wind
Takashi J. Moriya, Paolo A. Mazzali, Chris Ashall +1
The effects of the interaction between Type Ia supernova ejecta and their circumstellar wind on the photometric properties of Type Ia supernovae are investigated. We assume that a…
EMPRESS. XIV. Strong High Ionization Lines of Young Galaxies at : Ionizing Spectra Consistent with the Intermediate Mass Black Holes with
Shun Hatano, Masami Ouchi, Hiroya Umeda +16
We present ionizing spectra estimated at 13.6--100 eV for ten dwarf galaxies with strong high ionization lines of He {\sc {ii}}4686 and [Ne {\sc{v}}]3426 ([Ne {\sc{iv}}]24…
EMPRESS. XIII. Chemical Enrichments of Young Galaxies Near and Far at z ~ 0 and 4-10: Fe/O, Ar/O, S/O, and N/O Measurements with Chemical Evolution Model Comparisons
Kuria Watanabe, Masami Ouchi, Kimihiko Nakajima +14
We present gas-phase elemental abundance ratios of 7 local extremely metal-poor galaxies (EMPGs) including our new Keck/LRIS spectroscopy determinations together with 33 JWST $z\si…
Synthetic red supergiant explosion model grid for systematic characterization of Type II supernovae
Takashi J. Moriya, Bhagya M. Subrayan, Dan Milisavljevic +1
A new model grid containing 228,016 synthetic red supergiant explosions (Type II supernovae) is introduced. Time evolution of spectral energy distributions from 1 A to 50,000 A (10…
EMPRESS. XII. Statistics on the Dynamics and Gas Mass Fraction of Extremely-Metal Poor Galaxies
Yi Xu, Masami Ouchi, Yuki Isobe +49
We present demography of the dynamics and gas-mass fraction of 33 extremely metal-poor galaxies (EMPGs) with metallicities of and low stellar masses of $10^4-…
Radiative Acceleration of Dense Circumstellar Material in Interacting Supernovae
Daichi Tsuna, Kohta Murase, Takashi J. Moriya
Early-time light curves/spectra of some hydrogen-rich supernovae (SNe) give firm evidence on the existence of confined, dense circumstellar matter (CSM) surrounding dying massive s…
Inferencing Progenitor and Explosion Properties of Evolving Core-collapse Supernovae from Zwicky Transient Facility Light Curves
Bhagya M. Subrayan, Danny Milisavljevic, Takashi J. Moriya +9
We analyze a sample of 45 Type II supernovae from the Zwicky Transient Facility (ZTF) public survey using a grid of hydrodynamical models in order to assess whether theoretically-d…
A Multi-Wavelength View on the Rapidly-Evolving Supernova 2018ivc: An Analog of SN IIb 1993J but Powered Primarily by Circumstellar Interaction
Keiichi Maeda, Poonam Chandra, Takashi J. Moriya +15
SN 2018ivc is an unusual type II supernova (SN II). It is a variant of SNe IIL, which might represent a transitional case between SNe IIP with a massive H-rich envelope, and IIb wi…