Explaining the Early Excess Emission of the Type Ia Supernova 2018oh by the Interaction of the Ejecta with Disk-originated Matter

被引：26

作者：

Levanon, Naveh ^{[1
]}

Soker, Noam ^{[1
,2
]}

机构：

[1] Technion Israel Inst Technol, Dept Phys, IL-32000 Haifa, Israel

[2] Guangdong Technion Israel Inst Technol, Shantou 515069, Guangdong, Peoples R China

来源：

ASTROPHYSICAL JOURNAL LETTERS | 2019年 / 872卷 / 01期

基金：

以色列科学基金会;

关键词：

supernovae: general; white dwarfs; EVOLUTION;

D O I：

10.3847/2041-8213/ab0285

中图分类号：

P1 [天文学];

学科分类号：

0704 ;

摘要：

We explain the early excess emission of the Type Ia supernova 2018oh by an interaction of the supernova ejecta with disk-originated matter (DOM). Such DOM can form in the merger process of two white dwarfs in the double-degenerate scenario of Type Ia supernovae (SNe Ia). We find that an ejecta-DOM interaction can fit the early light curve of SN 2018oh better than an ejecta-companion interaction in the single-degenerate scenario. By composing the DOM from two components that were ejected in the merger process with two different velocities, we show that the ejecta-DOM interaction can account for the linear rise in the light curve, while the ejecta-companion interaction predicts too steep of a rise. In addition, the ejecta-DOM interaction does not predict the presence of hydrogen and helium lines in nebular spectra, and hence does not suffer from this major drawback of the ejecta-companion model. We consider the ejecta-DOM interaction to be the most likely explanation for the early excess emission in SN 2018oh. By that we show that the double-degenerate scenario can account for early excess emission in SNe Ia.

引用

页数：4

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