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108 papers
Probing the Nature of the Circumstellar Material Surrounding SN 2024ggi: A Search for Precursor Emission and Constraints from Radio Observations
Tobias Géron, James K. Leung, Maria R. Drout +8
We present an analysis of the pre-explosion optical light curve and post-explosion radio observations of the nearby supernova (SN) 2024ggi, a Type II SN discovered in NGC 3621 at a…
Shock breakout from mildly relativistic ejecta in a dense wind: the case of EP260321a/SN 2026gzf
Akihiro Suzuki, Keiichi Maeda, Toshikazu Shigeyama
We present shock breakout (SBO) modeling of the recently discovered X-ray transient EP260321a detected by the \textit{Einstein Probe} mission. Our semi-analytic model, based on our…
Delayed Wind Onset in Pa 30, the Remnant of Type Iax SN 1181
Takatoshi Ko, Ryosuke Hirai, Taiga Sasaoka +1
Pa 30 is the recently identified remnant of the historical supernova SN 1181, likely a Type Iax event, and a nebula surrounding the central white dwarf launching a fast wind ($\sim…
Radial pulsation runaway in massive red supergiants in late evolutionary stage and implications to hydrogen-rich supernovae
Akihiro Suzuki, Toshikazu Shigeyama
Performing a series of hydrodynamic stellar evolutionary simulations with \textsc{Mesa} (Module for Experiments in Stellar Astrophysics), we investigate the excitation and growth o…
A Common Origin of Normal Type Ia Supernovae Suggested by the Photometric Diversity
Weiyu Wu, Ji-an Jiang, Dezheng Meng +16
In recent years, with an increasing number of type Ia supernovae (SNe Ia) discovered soon after their explosions, a non-negligible fraction of SNe Ia with early-excess emissions (E…
Nuclear Burning in Accretion Flow of Helium-rich matter onto Compact Objects
Toshikazu Shigeyama, Akira Dohi
We investigate the impacts of nuclear burning on the spherically symmetric stationary accretion flow of helium-rich matter on to compact objects. We have already shown the existenc…