2021年12月
Discovery of the Fastest Early Optical Emission from Overluminous SN Ia 2020hvf: A Thermonuclear Explosion within a Dense Circumstellar Environment
ASTROPHYSICAL JOURNAL LETTERS
- 巻
- 923
- 号
- 1
- 記述言語
- 英語
- 掲載種別
- 研究論文(学術雑誌)
- DOI
- 10.3847/2041-8213/ac375f
- 出版者・発行元
- IOP Publishing Ltd
In this Letter we report a discovery of a prominent flash of a peculiar overluminous Type Ia supernova, SN 2020hvf, in about 5 hr 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 (circle dot) circumstellar material (CSM) extending to a distance of similar to 10(13) 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 (Ch) WD"). Systematical investigations on explosion mechanisms and hydrodynamic simulations of the super-M (Ch) WD explosion are required to further test the suggested scenario and understand the progenitor of this peculiar supernova.
- リンク情報
- ID情報
-
- DOI : 10.3847/2041-8213/ac375f
- ISSN : 2041-8205
- eISSN : 2041-8213
- ORCIDのPut Code : 104446249
- Web of Science ID : WOS:000728516400001