Moriya, TJ, Mazzali, PA, Ashall, C and Pian, E (2023) Early excess emission in Type Ia supernovae from the interaction between supernova ejecta and their circumstellar wind. Monthly Notices of the Royal Astronomical Society, 522 (4). pp. 6035-6042. ISSN 0035-8711

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Abstract

The effects of the interaction between Type Ia supernova ejecta and their circumstellar wind on the photometric properties of Type Ia supernovae are investigated. We assume that a hydrogen-rich, dense, and extended circumstellar matter (CSM) is formed by the steady mass-loss of their progenitor systems. The CSM density is assumed to be proportional to r−2. When the mass-loss rate is above 10−4 M⊙ yr−1 with a wind velocity of 100 km s−1, CSM interaction results in an early flux excess in optical light curves within 4 d of explosion. In these cases, the optical colour quickly evolves to the blue. The ultraviolet flux below 3000 Å is found to have a persistent flux excess compared to Type Ia supernovae as long as CSM interaction continues. Type Ia supernovae with progenitor mass-loss rates between 10−4 and 10−3 M⊙ yr−1 may not have a CSM that is dense enough to affect spectra to make them Type Ia CSM, but they may still result in Type Ia supernovae with an early optical flux excess. Because they have a persistent ultraviolet flux excess, ultraviolet light curves around the luminosity peak would be significantly different from those with a low-density CSM.

Item Type:	Article
Additional Information:	This article has been accepted for publication in Monthly Notices of the Royal Astronomical Society ©:2023 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society. All rights reserved.
Uncontrolled Keywords:	0201 Astronomical and Space Sciences; Astronomy & Astrophysics
Subjects:	Q Science > QB Astronomy Q Science > QC Physics
Divisions:	Astrophysics Research Institute
Publisher:	Oxford University Press (OUP)
SWORD Depositor:	A Symplectic
Date Deposited:	07 Feb 2024 16:13
Last Modified:	07 Feb 2024 16:13
DOI or ID number:	10.1093/mnras/stad1386
URI:	https://researchonline.ljmu.ac.uk/id/eprint/22536

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