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arXiv · 2510.16840

SN Ia-CSM 2020aeuh: Massive binary C/O WD merger?

N. N. Chugai
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Abstract

I explore the origin of the circumstellar (CS) shell of the unusual SN Ia 2020aeuh based on the light curve model abd observational constraints. I estimate the $^{56}$Ni mass ($1.1 M\odot$), CS shell mass ($0.04-0.2 M\odot$), radius ($2\times10^{16}$ cm), and expansion velocity $\lesssim 200$ km/s. Large $^{56}$Ni mass and properties of the CS shell are consistent with the scenario of massive binary white dwarf merger that has been accompanied with the ejection of $\sim 0.1 M\odot$ of matter. It is argued that SN~2020aeuh exploded not earlier than 30 yr after the merger.

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N. N. Chugai. 2025-10-19. SN Ia-CSM 2020aeuh: Massive binary C/O WD merger?. https://arxiv.org/abs/2510.16840

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