A5008428699- Gamma-ray bursts and supernovae
- Astrophysical Phenomena and Observations
- Astro and Planetary Science
- Astrophysics and Cosmic Phenomena
- Stellar, planetary, and galactic studies
Kyoto University
2023-2024
ABSTRACT We present photometric, spectroscopic, and polarimetric observations of the intermediate-luminosity Type IIP supernova (SN) 2021gmj from 1 to 386 d after explosion. The peak absolute V-band magnitude SN is −15.5 mag, which fainter than that normal SNe. spectral evolution resembles other sub-luminous SNe: optical spectra show narrow P-Cygni profiles, indicating a low expansion velocity. estimate progenitor mass be about 12 $\rm {\rm M}_{\odot}$ nebular spectrum 56Ni 0.02 bolometric...
We have performed intensive follow-up observations of a Type IIn/Ia-CSM SN (SN IIn/Ia-CSM), 2020uem, with photometry, spectroscopy, and polarimetry. In this paper, we report on the results our focusing optical/near-infrared (NIR) photometry spectroscopy. The maximum V-band magnitude 2020uem is over $-19.5$ mag. light curves decline slowly rate $\sim 0.75 {\rm ~mag}/100 ~days}$. late phase ($\gtrsim 300$ days), show accelerated decay ($\sim 1.2 ~days}$). optical spectra prominent hydrogen...
Type IIn/Ia-CSM supernovae (SNe IIn/Ia-CSM) are classified by their characteristic spectra, which exhibit narrow hydrogen emission lines originating from a strong interaction with circumstellar medium (CSM) together broad of intermediate-mass elements. We performed intensive follow-up observations SN 2020uem, including photometry, spectroscopy, and polarimetry. In this paper, we focus on the results imaging polarimetry at $66$ days spectropolarimetry $103$ after discovery. 2020uem shows high...
We present photometric, spectroscopic and polarimetric observations of the intermediate-luminosity Type IIP supernova (SN) 2021gmj from 1 to 386 days after explosion. The peak absolute V-band magnitude SN is -15.5 mag, which fainter than that normal SNe. spectral evolution resembles other sub-luminous supernovae: optical spectra show narrow P-Cygni profiles, indicating a low expansion velocity. estimate progenitor mass be about 12 Msun nebular spectrum 56Ni 0.02 bolometric light curve. also...
Abstract It has been widely accepted that Type Ia supernovae (SNe Ia) are thermonuclear explosions of a CO white dwarf. However, the natures progenitor system(s) and explosion mechanism(s) still unclarified. Thanks to recent development transient observations, they now frequently discovered shortly after explosion, followed by rapid spectroscopic observations. In this study, modeling very-early-phase spectra SNe Ia, we try constrain models Ia. By using Monte Carlo radiation transfer code,...