Mon. Not. R. Astron. Soc., 477, 153-174 (2018/June-2)
On the type Ia supernovae 2007on and 2011iv: evidence for Chandrasekhar-mass explosions at the faint end of the luminosity-width relationship.
ASHALL C., MAZZALI P.A., STRITZINGER M.D., HOEFLICH P., BURNS C.R., GALL C., HSIAO E.Y., PHILLIPS M.M., MORRELL N. and FOLEY R.J.
Abstract (from CDS):
Radiative transfer models of two transitional type Ia supernovae (SNe Ia) have been produced using the abundance stratification technique. These two objects - designated SN 2007on and SN 2011iv - both exploded in the same galaxy, NGC 1404, which allows for a direct comparison. SN 2007on synthesized 0.25 M☉ of 56Ni and was less luminous than SN 2011iv, which produced 0.31 M☉ of 56Ni. SN 2007on had a lower central density (ρc) and higher explosion energy (Ekin ∼1.3 ± 0.3 x 1051erg) than SN 2011iv, and it produced less nuclear statistical equilibrium (NSE) elements (0.06 M☉). Whereas, SN 2011iv had a larger ρc, which increased the electron capture rate in the lowest velocity regions, and produced 0.35 M☉ of stable NSE elements. SN 2011iv had an explosion energy of ∼Ekin ∼0.9 ± 0.2 x 1051erg. Both objects had an ejecta mass consistent with the Chandrasekhar mass (Ch-mass), and their observational properties are well described by predictions from delayed-detonation explosion models. Within this framework, comparison to the sub-luminous SN 1986G indicates SN 2011iv and SN 1986G have different transition densities (ρtr) but similar ρc. Whereas SN 1986G and SN 2007on had a similar ρtr but different ρc. Finally, we examine the colour-stretch parameter sBV versus Lmax relation and determine that the bulk of SNe Ia (including the sub-luminous ones) are consistent with Ch-mass delayed-detonation explosions, where the main parameter driving the diversity is ρtr. We also find ρc to be driving the second-order scatter observed at the faint end of the luminosity-width relationship.
© 2018 The Author(s) Published by Oxford University Press on behalf of the Royal Astronomical Society
radiative transfer - techniques: spectroscopic - stars: abundances - supernova: general - supernovae: individual: ((SN 2007on, 2011iv))
View the references in ADS
To bookmark this query, right click on this link: simbad:2018MNRAS.477..153A and select 'bookmark this link' or equivalent in the popup menu