Explosions of blue supergiants from binary mergers for SN 1987A. Issue 1 (3rd October 2018)

• Record Type: Journal Article
• Authors: Menon, Athira; Utrobin, Victor; Heger, Alexander
• Is Part Of: Monthly notices of the Royal Astronomical Society. Volume 482:Issue 1(2019)
• Page Start: 438
• Page End: 452
• Publication Date: 2018-10-03
• Subjects: methods: numerical -- binaries: general -- stars: evolution -- supergiants -- supernovae: general -- supernovae: individual: SN 1987A, SN 1998A, SN 2006V; Astronomy -- Periodicals; Periodicals; 520.5
• DOI: 10.1093/mnras/sty2647
• Languages: English
• ISSNs: 0035-8711

Abstract

Abstract: Based on the work of Menon & Heger, we present the bolometric light curves and spectra of the explosions of blue supergiant progenitors from binary mergers. We study SN 1987A and two other peculiar Type IIP supernovae: SN 1998A and SN 2006V. The progenitor models were produced using the stellar evolution code kepler and then exploded using the 1D radiation hydrodynamic code crab . The explosions of binary merger models exhibit an overall better fit to the light curve of SN 1987A than previous single star models because of their lower helium-core masses, larger envelope masses, and smaller radii. The merger model that best matches the observational constraints of the progenitor of SN 1987A and the light curve is a model with a radius of $37\, \mathrm{R}_\odot \, $, an ejecta mass of $20.6\, \mathrm{M}_\odot \, $, an explosion energy of $1.7\times 10^{51}\, $ erg, a nickel mass of $0.073\, \mathrm{M}_\odot \, $, and a nickel mixing velocity of $3\!000\, {\, \mathrm{km}\, \mathrm{s}^{-1}}\, $ . This model also works for SN 1998A and is comparable with earlier estimates from semi-analytic models. In the case of SN 2006V, however, a model with a radius of $150\, \mathrm{R}_\odot \, $ and ejecta mass of $19.1\, \mathrm{M}_\odot \, $ matches the light curve. These parameters are significantly higher than predictions from semi-analytic models for the progenitor of this supernova.