Dutta, Anirban ; Anupama, G. C. ; Chakradhari, Nand Kumar ; Sahu, D. K. (2022) Can the Violent Merger of White Dwarfs Explain the Slowest Declining Type Ia Supernova SN 2011aa? The Astrophysical Journal Letters, 938 (2). L22. ISSN 2041-8205
![]() |
PDF
3MB |
Official URL: http://doi.org/10.3847/2041-8213/ac940d
Related URL: http://dx.doi.org/10.3847/2041-8213/ac940d
Abstract
We present optical observations and Monte Carlo radiative transfer modeling of the Type Ia supernova (SN Ia) SN 2011aa. With a Δm15(B) of 0.59 ± 0.07 mag and a peak magnitude MB of −19.30 ± 0.27 mag, SN 2011aa has the slowest decline rate among SNe Ia. The secondary maximum in the I band is absent or as equally bright as the primary maximum. The velocity of C ii is lower than the velocity of Si ii. This indicates either the presence of C at lower velocities than Si or a line-of-sight effect. Application of Arnett's radiation diffusion model to the bolometric light curve indicates a massive ejecta Mej 1.8–2.6 M⊙. The slow decline rate and large ejecta mass, with a normal peak magnitude, are well explained by a double degenerate, violent merger explosion model. The synthetic spectra and light curves generated with SEDONA considering a violent merger density profile match the observations.
Item Type: | Article |
---|---|
Source: | Copyright of this article belongs to IOP Publishing |
ID Code: | 130567 |
Deposited On: | 01 Dec 2022 10:52 |
Last Modified: | 01 Dec 2022 10:52 |
Repository Staff Only: item control page