Nomoto 2009 第一代星和Ib型超新星的联系

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Title:		First Stars Type Ib Supernovae Connection
Authors:		Nomoto, Ken'ichi; Tanaka, Masaomi; Kamiya, Yasuomi; Tominaga, Nozomu; Maeda, Keiichi
Publication:		Low-Metallicity Star Formation: From the First Stars to Dwarf Galaxies, Proceedings of the International Astronomical Union, IAU Symposium, Volume 255, p. 182-188
Publication Date:		12/2008
Origin:		CUP
Keywords:		Galaxy: halo, gamma rays: bursts, nuclear reactions, nucleosynthesis, abundances, stars: abundances, stars: Population II, supernovae: general
Abstract Copyright:		(c) 2008: Copyright © International Astronomical Union 2008
DOI:		10.1017/S1743921308024794
Bibliographic Code:		2008IAUS..255..182N

Abstract

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 M_MS = 20 ‑ 25M_ȯ with an explosion of kinetic energy of E_K ~ 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.

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