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Pulsational Pair-Instability Model for Superluminous Supernova PTF12dam: Interaction and Radioactive Decay
Alexey Tolstov, Ken'ichi Nomoto, Sergei Blinnikov +3
Being a superluminous supernova (SLSN), PTF12dam can be explained by a Ni-powered model, a magnetar-powered model or an interaction model. We propose that PTF12dam is a puls…
Do Stellar Winds Prevent the Formation of Supermassive Stars by Accretion?
Daisuke Nakauchi, Takashi Hosokawa, Kazuyuki Omukai +2
Supermassive stars (SMS; ~ 10^5 M_sun) formed from metal-free gas in the early Universe attract attention as progenitors of supermassive black holes observed at high redshifts. To…
Impact of New Gamow-Teller Strengths on Explosive Type Ia Supernova Nucleosynthesis
Kanji Mori, Michael A. Famiano, Toshitaka Kajino +6
Recent experimental results have confirmed a possible reduction in the GT strengths of pf-shell nuclei. These proton-rich nuclei are of relevance in the deflagration and explos…
An Effective Selection Method for Low-Mass Active Black Holes and First Spectroscopic Identification
Tomoki Morokuma, Nozomu Tominaga, Masaomi Tanaka +13
We present a new method to effectively select objects which may be low-mass active black holes (BHs) at galaxy centers using high-cadence optical imaging data, and our first spectr…
The critical mass ratio of double white dwarf binaries for violent merger-induced Type Ia supernova explosions
Yushi Sato, Naohito Nakasato, Ataru Tanikawa +3
Mergers of carbon-oxygen (CO) white dwarfs (WDs) are considered as one of the potential progenitors of type Ia supernovae (SNe Ia). Recent hydrodynamical simulations showed that th…
Rapidly Rising Transients from Subaru Hyper Suprime-Cam Transient Survey
Masaomi Tanaka, Nozomu Tominaga, Tomoki Morokuma +13
We present rapidly rising transients discovered by a high-cadence transient survey with Subaru telescope and Hyper Suprime-Cam. We discovered five transients at z=0.384-0.821 showi…