Discovery of the Fastest Early Optical Emission from Overluminous SN Ia 2020hvf: A Thermonuclear Explosion within a Dense Circumstellar Environment
| Autor: | Jiang, Ji-an, Maeda, Keiichi, Kawabata, Miho, Doi, Mamoru, Shigeyama, Toshikazu, Tanaka, Masaomi, Tominaga, Nozomu, Nomoto, Ken'ichi, Niino, Yuu, Sako, Shigeyuki, Ohsawa, Ryou, Schramm, Malte, Yamanaka, Masayuki, Kobayashi, Naoto, Takahashi, Hidenori, Nakaoka, Tatsuya, Kawabata, Koji S., Isogai, Keisuke, Aoki, Tsutomu, Kondo, Sohei, Mori, Yuki, Arimatsu, Ko, Kasuga, Toshihiro, Okumura, Shin-ichiro, Urakawa, Seitaro, Reichart, Daniel E., Taguchi, Kenta, Arima, Noriaki, Beniyama, Jin, Uno, Kohki, Hamada, Taisei |
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| Rok vydání: | 2021 |
| Předmět: | |
| Zdroj: | ApJL 923, L8 (2021) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.3847/2041-8213/ac375f |
| Popis: | In this Letter we report a discovery of a prominent flash of a peculiar overluminous Type Ia supernova, SN 2020hvf, in about 5 hours of the supernova explosion by the first wide-field mosaic CMOS sensor imager, the Tomo-e Gozen Camera. The fast evolution of the early flash was captured by intensive intranight observations via the Tomo-e Gozen high-cadence survey. Numerical simulations show that such a prominent and fast early emission is most likely generated from an interaction between $0.01~M_{\odot}$ circumstellar material (CSM) extending to a distance of $\sim$$10^{13}~\text{cm}$ and supernova ejecta soon after the explosion, indicating a confined dense CSM formation at the final evolution stage of the progenitor of SN 2020hvf. Based on the CSM-ejecta interaction-induced early flash, the overluminous light curve, and the high ejecta velocity of SN 2020hvf, we suggest that the SN 2020hvf may originate from a thermonuclear explosion of a super-Chandrasekhar-mass white dwarf ("super-$M\rm_{Ch}$ WD"). Systematical investigations on explosion mechanisms and hydrodynamic simulations of the super-$M\rm_{Ch}$ WD explosion are required to further test the suggested scenario and understand the progenitor of this peculiar supernova. Comment: 20pages, 6 figures, accepted for publication in the Astrophysical Journal Letters |
| Databáze: | arXiv |
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