Light Curve Studies of SN 1993J and SN 1994I
Abstract
Numerical light curve calculations have been carried out to constrain the light-curve parameters of the recent SNs 1993J and 1994I. For SN 1993J the radius of the progenitor star is constrained to be in the range 2--4 x 1013 cm which is consistent with the candidate progenitor star. The ejected mass is constrained to be in the range 1.9--3.5 M⊙ equating the ejected mass to the helium core mass of the progenitor implies a main-sequence mass in the range 12--17 M⊙. Using the new Cepheid distance to M81, the ejected 56Ni mass is found to be in the range 0.10--0.14 M⊙. For SN 1994I the ejected mass is in the range 0.9--1.3 M⊙ equating the ejected mass to the carbon-oxygen core mass of the progenitor implies a main-sequence mass in the range 13--20 M⊙. For a distance of 7 Mpc and an extinction AV = 1.4 mag, the ejected 56Ni mass is found to be 0.07 M⊙. Recent studies of galactic chemical evolution have suggested that the main-sequence masses and ejected 56{Ni} masses of core collapse SNs may be inversely correlated. We examine this effect for 1993J, 1994I, and 1987A, but the small number of known nickel mass--main-sequence mass systems makes it too early to draw definitive conclusions.
- Publication:
-
The Astrophysical Journal
- Pub Date:
- August 1995
- DOI:
- 10.1086/309618
- Bibcode:
- 1995ApJ...449L..51Y
- Keywords:
-
- STARS: EVOLUTION;
- STARS: SUPERNOVAE: GENERAL;
- STARS: SUPERNOVAE: INDIVIDUAL ALPHANUMERIC: SN 1993J;
- STARS: SUPERNOVAE: INDIVIDUAL ALPHANUMERIC: SN 1994I