Analysis of the early spectra and light curve of SN 1987A

Details Analysis of the early spectra and light curve of SN 1987A Analysis of the early spectra and light curve of SN 1987A

Apr 1994

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994apj...424..905h&link_type=abstract

Astrophysical Journal, Part 1 (ISSN 0004-637X), vol. 424, no. 2, p. 905-923

Computer Science

Numerical Analysis

16

Hydrodynamics, Light Curve, Radiative Transfer, Relativity, Stellar Evolution, Stellar Models, Stellar Spectra, Supernova 1987A, Calcium, Density Distribution, Helium, Hydrogen, Magnesium, Mathematical Models, Numerical Analysis, Opacity, Temperature Distribution, Velocity Distribution

Scientific paper

Numerical modeling of supernova spectra, light curves, and hydrodynamics requires physical inputs, numerical techniques, approximations, and assumptions which must be thoroughly understood in order to study the details of supernova explosions. Here, we discuss some of these in the context of the early evolution of supernova 1987A. Gray radiation-hydrodynamics is used to calculate the bolometric light curve and the hydrodynamic evolution of the supernova. Synthetic spectra are then obtained for the resulting density and velocity structure. The spectrum calculations are performed using a special-relativistic treatment of the radiative transfer equation in the comoving frame, line blanketing by about 105 spectral lines, and departures from local thermodynamic equilibrium (LTE) for H I, He I, Mg II, and Ca II. We find that we are able to simultaneously fit the early light curve and spectra reasonably well, using a progenitor model from Arnett (1991a), without fine-tuning the free parameters. Temperature structures and radiative equilibrium, non-LTE effects, homologous expansion, and mean opacities are discussed.

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