The Peculiar Type II Supernova 1997 D: A Case for a Very Low 56Ni Mass

Abstract

SN 1997D in NGC 1536 is possibly the least luminous and energetic Type II supernova discovered to date. The entire light curve is subluminous, never reaching $M_V=-14.65$. The radioactive tail follows the 56Co decay slope. In the case of nearly complete trapping of the $\gamma$-rays, the 56Ni mass derived from the tail brightness is extremely small, $\sim 0.002$ \M. At discovery the spectra showed a red continuum and line velocities of the order of 1000 \kms. The luminosity and the photospheric expansion velocity suggest that the explosion occurred about 50 days before discovery, and that a plateau probably followed. Model light curves and spectra of the explosion of a 26 \M\ star successfully fit the observations. Low mass models are inconsistent with the observations. The radius of the progenitor, constrained by the prediscovery upper limits, is \r0 \ltsim 300 \R. A low explosion energy of $\sim 4\times 10^{50}$ ergs is then required in the modeling. The strong \ion{Ba}{2} lines in the photospheric spectra are reproduced with a solar abundance and low $T_{eff}$. A scenario in which the low 56Ni mass observed in SN 1997D is due to fall--back of material onto the collapsed remnant of the explosion of a 25--40 \M star appears to be favored over the case of the explosion of an 8--10 \M\ star with low 56Ni production.

arXiv comment16 pages, 4 figures ApJL accepted

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