The Late Behavior of Supernova 1987A. II. Gamma-Ray Transparency of the Ejecta

Details The Late Behavior of Supernova 1987A. II. Gamma-Ray Transparency of the Ejecta The Late Behavior of Supernova 1987A. II. Gamma-Ray Transparency of the Ejecta

May 1989

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989apj...340..414f&link_type=abstract

Astrophysical Journal v.340, p.414

Astronomy and Astrophysics

Astronomy

19

Gamma Rays: General, Nucleosynthesis, Stars: Individual Alphanumeric: Sn 1987A, Stars: Supernovae, X-Rays: Sources

Scientific paper

In the wake of news of gamma rays detected by the SMM satellite from SN 1987A, and continued reports of X-rays detected by Ginga, we investigate the problem of computing the luminosities in gamma-ray lines and in X-rays from the supernova, employing results of (1) radiation hydrodynamic models for the bolometric light curve (Arnett 1987), and (2) analytic light curve models (Arnett and Fu 1989), in order to constrain several parameters which are crucial for calculation of the radiative transfer. In addition, these results point to two important uncertainties: (1) the extent of mixing of NiCo-rich matter in the ejecta, and (2) the mass density profile during the coasting phase of the expansion. By exploring a range of both the radioactive mass distribution and density profile, we find that the high-energy observations strongly suggest the development of large- scale clumping and "bubbling" of radioactive material in the ejecta. The favored models have a hydrogen envelope mass of ˜7 Msun, homologous scale expansion velocities of ˜3000 km s-1, and an approximately uniform mass distribution. As we show, these features are consistent with three important constraints: (1) the presupernova mass had a helium core of 6 Msun; (2) the edge of the helium core is moving at ˜2100 km s-1; (3) values of ESN/M are constrained by the early optical observations and models to be 0.7(±0.3) × 1017 ergs g-1.

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