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First Stars – Type Ib Supernovae Connection

Published online by Cambridge University Press:  01 June 2008

Ken'ichi Nomoto ,
Masaomi Tanaka ,
Yasuomi Kamiya ,
Nozomu Tominaga  and
Keiichi Maeda
Ken'ichi Nomoto
Affiliation:
Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Chiba 277-8568, Japan email: nomoto@astron.s.u-tokyo.ac.jp Department of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Masaomi Tanaka
Affiliation:
Department of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Yasuomi Kamiya
Affiliation:
Department of Astronomy, University of Tokyo, Bunkyo-ku, Tokyo 113-0033, Japan
Nozomu Tominaga
Affiliation:
National Astronomical Observatory, Mitaka, Tokyo 113-0033, Japan
Keiichi Maeda
Affiliation:
Institute for the Physics and Mathematics of the Universe, University of Tokyo, Kashiwa, Chiba 277-8568, Japan email: nomoto@astron.s.u-tokyo.ac.jp
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Abstract

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The very peculiar abundance patterns observed in extremely metal-poor (EMP) stars can not be explained by conventional normal supernova nucleosynthesis but can be well-reproduced by nucleosynthesis in hyper-energetic and hyper-aspherical explosions, i.e., Hypernovae (HNe). Previously, such HNe have been observed only as Type Ic supernovae. Here, we examine the properties of recent Type Ib supernovae (SNe Ib). In particular, SN Ib 2008D associated with the luminous X-ray transient 080109 is found to be a more energetic explosion than normal core-collapse supernovae. We estimate that the progenitor's main sequence mass is MMS = 20 − 25M⊙ with an explosion of kinetic energy of EK ~ 6.0 × 1051 erg. These properties are intermediate between those of normal SNe and hypernovae associated with gamma-ray bursts. Therefore, such energetic SNe Ib could also make an important contribution to the chemical enrichment in the early Universe.

Keywords

Galaxy: halogamma rays: burstsnuclear reactionsnucleosynthesisabundancesstars: abundancesstars: Population IIsupernovae: general
Type
Contributed Papers
Information
Proceedings of the International Astronomical Union , Volume 4 , Issue S255: Low-Metallicity Star Formation: From the First Stars to Dwarf Galaxies , June 2008 , pp. 182 - 188
Copyright
Copyright © International Astronomical Union 2008

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