ON SN 2003fg: THE PROBABLE SUPER-CHANDRASEKHAR-MASS SN Ia
نویسنده
چکیده
Howell et al. have reported the discovery of SN Ia SN 2003fg (SNLS-03D3bb) and conclude that SN 2003fg is very likely a super-Chandrasekhar-mass SN Ia perhaps with a mass∼ 2M⊙. Their work is the first strong evidence that has been presented for a super-Chandrasekhar SN Ia. We have performed an analysis of the SN 2003fg data using the Yoon & Langer binding energy formula for a rotating super-Chandrasekhar-mass white dwarf (also used by Howell et al.) included in a simple model of SNe Ia (which we call the SSC model for Simple SuperChandrasekhar model for SNe Ia) which assumes spherically symmetric ejecta and relies on the approximations of an exponential density profile for SN Ia ejecta and of a sharp boundary of the SN Ia iron-peak-element core. Our results support the conclusion of Howell et al.: SN 2003fg is very probably super-Chandrasekhar and probably has mass ∼ 2M⊙. Subject headings: supernovae: general — supernovae: SN 2003fg (SNLS-03D3bb)
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