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Properties of Thorne-Zytkow object explosions
Takashi J. Moriya, Sergei I. Blinnikov
Thorne-Zytkow objects are stars that have a neutron star core with an extended hydrogen-rich envelope. Massive Thorne-Zytkow objects are proposed to explode when the nuclear reacti…
Discovery of a Wind-Blown Bubble Associated with the Supernova Remnant G346.6-0.2: A Hint for the Origin of Recombining Plasma
H. Sano, H. Suzuki, K. K. Nobukawa +3
We report on CO and HI studies of the mixed-morphology supernova remnant (SNR) G346.60.2. We find a wind-blown bubble along the radio continuum shell with an expansion velocity…
EMPRESS. IV. Extremely Metal-Poor Galaxies (EMPGs) Including Very Low-Mass Primordial Systems with M*=10^4--10^5 M_sun and 2--3% (O/H)_sun: High (Fe/O) Suggestive of Metal Enrichment by Hypernovae/Pair-Instability Supernovae
Yuki Isobe, Masami Ouchi, Akihiro Suzuki +22
We present Keck/LRIS follow-up spectroscopy for 13 photometric candidates of extremely metal poor galaxies (EMPGs) selected by a machine-learning technique applied to the deep (~26…
Discovering Supernovae at Epoch of Reionization with Nancy Grace Roman Space Telescope
Takashi J. Moriya, Robert M. Quimby, Brant E. Robertson
Massive stars play critical roles for the reionization of the Universe. Individual massive stars at the reionization epoch (z > 6) are too faint to observe and quantify their contr…
The final months of massive star evolution from the circumstellar environment around SN Ic 2020oi
Keiichi Maeda, Poonam Chandra, Tomoki Matsuoka +8
We present the results of ALMA band 3 observations of a nearby type Ic supernova (SN) 2020oi. Under the standard assumptions on the SN-circumstellar medium (CSM) interaction and th…
Observational properties of a general relativistic instability supernova from a primordial supermassive star
Takashi J. Moriya, Ke-Jung Chen, Kimihiko Nakajima +2
We present the expected observational properties of a general relativistic instability supernova (GRSN) from the 55,500 Msun primordial (Population III) star. Supermassive stars ex…
Constraining red supergiant mass-loss prescriptions through supernova radio properties
Takashi J. Moriya
Supernova properties in radio strongly depend on their circumstellar environment and they are an important probe to investigate the mass loss of supernova progenitors. Recently, co…