Constraining Explosion Date and Progenitor Properties of SN 1998S with Early Photometry

Astronomy and Astrophysics – Astronomy

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We present early optical light curves of Type IIn Supernova 1998S (SN 1998S), including new photometry data taken by the Beijing Astronomical Observatories of China on 1998 March 2.7, or 10 days before optical maximum. The light curve is compared with analytical supernova explosion models of red supergiant stars by Nakar & Sari (2010, ApJ, 725, 904, or NS10) and Rabinak & Waxman (2011, ApJ, 728, 63, or RW11). Both models fit the data well and constrain the time of explosion of SN 1998S to be 1998 March 2.0 ± 0.3 (JD 2450874.5 ± 0.3). In addition, with these models we tried to determine the physical parameters of the progenitor star and the supernova explosion. For the NS10 model, the best-fit progenitor mass, radius, and explosion energy are 15 M_sol, 300 R_sol, and 8 x 1051 ergs respectively, while those for the RW11 model are 15 M_sol, 2000 R_sol, and 3 x 1051 ergs respectively.

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