Other
Scientific paper
Feb 1991
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991phdt........77h&link_type=abstract
Thesis (PH.D.)--MASSACHUSETTS INSTITUTE OF TECHNOLOGY, 1991.Source: Dissertation Abstracts International, Volume: 53-02, Secti
Other
3
Supernovae
Scientific paper
This thesis is a study of the early ( _sp{~}<200 days) light curves, velocity profiles, and other observables of type II supernovae as functions of the explosion energy and characteristics of the progenitor. One-dimensional hydrodynamic calculations, including the effects of radiative transfer, were performed on a set of model progenitor stars that had previously undergone mass transfer to or from their close-binary companions during Roche-lobe overflow. We consider (1) red giants which have lost mass to their companion stars; and (2) blue supergiants which are the result of merger with or mass transfer from their companions. For red giants, we see a gradual evolution of the light curve from a "plateau" shape to a "linear" shape as the mass in the hydrogen-rich envelope of the red-giant progenitor is decreased. These results suggest that the mass-loss models may indeed be plausible progenitors for supernova type II-L's (type II linears). For blue supergiants, we find that there are discernible differences between supernovae with blue and red supergiant progenitors. Because the blue supergiants were initially more compact, more of the input explosion energy goes into overcoming the gravitational potential energy instead of being converted to internal energy and, subsequently, radiation. Therefore, compared to the supernova of a red supergiant of comparable mass, the supernova of a blue supergiant is expected to be initially underluminous. Further, because of steeper density gradients in the blue supergiants, their supernovae have higher ejecta velocities than those of the red supergiants. Many of the characteristics of our theoretical supernova models of this former type are similar to those observed in SN 1987A. The effect of nickel/cobalt (Ni/Co) decay on the light curves of a supernova is more significant for those of red giants with smaller envelope masses and for those of blue supergiants than for those of red giants without mass loss. We expect that approximately 10% of all massive stars become progenitors of type II supernovae which may show effects of binary mass exchange. (Copies available exclusively from MIT Libraries, Rm. 14-0551, Cambridge, MA 02139-4307. Ph. 617-253-5668; Fax 617-253-1690.) (Abstract shortened with permission of school.).
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