Brown 2008 SN 2008D may be the same as SN 1987A

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Title:		Supernova 2008D: A Repetition of Supernova 1987A In a Binary
Authors:		Brown, Gerald E.; Lee, Chang-Hwan
Publication:		eprint arXiv:0810.0912
Publication Date:		10/2008
Origin:		ARXIV
Keywords:		Astrophysics
Comment:		4 pages, 1 figure
Bibliographic Code:		2008arXiv0810.0912B

Abstract

The Supernova 2008D is similar to that of SN 1987A without the H-envelope. Soderberg et al.(2008) reported the serendipitous discovery of the SN2008D at the time of the explosion, accompanied by an X-ray outburst XRF080109. The central remnant, which we believe to be the black-hole (BH) central engine in the Blandford-Znajek mechanism, is estimated, on the basis of the 7% 56Ni production, to have a mass of 1.6-1.8 M_sun. This is not much larger than the upper limit of 1.56 m_sun for the mass of the compact object in SN1987A found by Bethe & Brown (1995); also, on the basis of the 7.5% 56Ni production, they interpreted it as a low-mass BH. Redoing the light curve so as to take into account the absence of convective carbon burning from zero age main sequence 18-24 M_sun and replacing it by carbon shell burning, we see that the remnant in SN2008D must be less massive than in SN 1987A; there of 18 M_sun. Thus, the maximum neutron star mass is 1.5 M_sun. Note that the metallicity of the host galaxy of SN2008D is similar to that of our Galaxy.

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