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Nucleosynthesis in Black-Hole-Forming Supernovae

Published online by Cambridge University Press:  19 September 2016

K. Nomoto ,
K. Maeda ,
H. Umeda ,
N. Tominaga ,
T. Ohkubo ,
J. Deng  and
P.A. Mazzali
K. Nomoto
Affiliation:
Department of Astronomy & Research Center for the Early Universe, University of Tokyo, Tokyo, Japan;[email protected]
K. Maeda
Affiliation:
Department of Astronomy & Research Center for the Early Universe, University of Tokyo, Tokyo, Japan;[email protected]
H. Umeda
Affiliation:
Department of Astronomy & Research Center for the Early Universe, University of Tokyo, Tokyo, Japan;[email protected]
N. Tominaga
Affiliation:
Department of Astronomy & Research Center for the Early Universe, University of Tokyo, Tokyo, Japan;[email protected]
T. Ohkubo
Affiliation:
Department of Astronomy & Research Center for the Early Universe, University of Tokyo, Tokyo, Japan;[email protected]
J. Deng
Affiliation:
Department of Astronomy & Research Center for the Early Universe, University of Tokyo, Tokyo, Japan;[email protected]
P.A. Mazzali
Affiliation:
Department of Astronomy & Research Center for the Early Universe, University of Tokyo, Tokyo, Japan;[email protected] Osservatorio Astronomico, Via Tiepolo, 11, 34131 Trieste, Italy

Summary

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Stars more massive than ~ 20 − 25 M⊙ form a black hole at the end of their evolution. Stars with non-rotating black holes are likely to collapse “quietly” ejecting a small amount of heavy elements (faint supernovae). In contrast, stars with rotating black holes are likely to give rise to very energetic supernovae (hypernovae). We present distinct nucleosynthesis features of these two types of “black-hole-forming” supernovae. Nucleosynthesis in hypernovae is characterized by larger abundance ratios (Zn, Co, V, Ti)/Fe and smaller (Mn, Cr)/Fe than normal supernovae, which can explain the observed trend of these ratios in extremely metal-poor stars. Nucleosynthesis in faint supernovae is characterized by a large amount of fall-back. We show that the abundance pattern of the recently discovered most Fe-poor star, HE0107-5240, and other extremely metal-poor carbon-rich stars are in good accord with those of black-hole-forming supernovae, but not pair-instability supernovae. This suggests that black-hole-forming supernovae made important contributions to the early Galactic (and cosmic) chemical evolution. Finally we discuss the nature of first (Pop III) Stars.

Type
Part IV Supernovae: Models
Information
International Astronomical Union Colloquium , Volume 192: Cosmic Explosions , 2005 , pp. 287 - 296
Copyright
Copyright © Springer-Verlag 2005

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