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Supernova 2007bi as a pair-instability explosion
Gal-Yam, A.1; Mazzali, P.2,3; Ofek, E. O.4; Nugent, P. E.5; Kulkarni, S. R.4; Kasliwal, M. M.4; Quimby, R. M.4; Filippenko, A. V.6; Cenko, S. B.6; Chornock, R.6; Waldman, R.7; Kasen, D.8; Sullivan, M.9; Beshore, E. C.10; Drake, A. J.4; Thomas, R. C.5; Bloom, J. S.6; Poznanski, D.6; Miller, A. A.6; Foley, R. J.11; Silverman, J. M.6; Arcavi, I.1; Ellis, R. S.4; Deng, J.12
2009-12-03
发表期刊NATURE
卷号462期号:7273页码:624-627
摘要Stars with initialmasses such that 10M(circle dot) <= M(initial) <= 100M(circle dot), where M(circle dot) is the solar mass, fuse progressively heavier elements in their centres, until the core is inert iron. The core then gravitationally collapses to a neutron star or a black hole, leading to an explosion-an iron-core-collapse supernova(1,2). By contrast, extremely massive stars with M(initial) >= 140M(circle dot) (if such exist) develop oxygen cores with masses, M(core), that exceed 50M(circle dot), where high temperatures are reached at relatively low densities. Conversion of energetic, pressure-supporting photons into electron-positron pairs occurs before oxygen ignition and leads to a violent contraction which triggers a nuclear explosion(3-5) that unbinds the star in a pair-instability supernova. Transitional objects with 100M(circle dot) < M(initial) < 140M(circle dot) may end up as iron-core-collapse supernovae following violent mass ejections, perhaps as a result of brief episodes of pair instability, and may already have been identified(6-8). Here we report observations of supernova SN 2007bi, a luminous, slowly evolving object located within a dwarf galaxy. We estimate the exploding core mass to be M(core) approximate to 100M(circle dot), in which case theory unambiguously predicts a pair-instability supernova. We show that >3M(circle dot) of radioactive (56)Ni was synthesized during the explosion and that our observations are well fitted by models of pair-instability supernovae(9,10). This indicates that nearby dwarf galaxies probably host extremely massive stars, above the apparent Galactic stellar mass limit(11), which perhaps result from processes similar to those that created the first stars in the Universe.
DOI10.1038/nature08579
收录类别SCI
语种英语
WOS记录号WOS:000272277900035
引用统计
被引频次:263[WOS]   [WOS记录]     [WOS相关记录]
文献类型期刊论文
条目标识符http://ir.bao.ac.cn/handle/114a11/7616
专题空间科学研究部
作者单位1.Weizmann Inst Sci, Fac Phys, Benoziyo Ctr Astrophys, IL-76100 Rehovot, Israel
2.Max Planck Inst Astrophys, D-85748 Garching, Germany
3.Scuola Normale Super Pisa, I-56127 Pisa, Italy
4.CALTECH, Dept Astron, Pasadena, CA 91125 USA
5.Univ Calif Berkeley, Lawrence Berkeley Lab, Berkeley, CA 94720 USA
6.Univ Calif Berkeley, Dept Astron, Berkeley, CA 94720 USA
7.Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel
8.Univ Calif Santa Cruz, Dept Astron & Astrophys, Santa Cruz, CA 95064 USA
9.Univ Oxford, Dept Astrophys, Oxford OX1 3RH, England
10.Univ Arizona, Dept Planetary Sci, Lunar & Planetary Lab, Tucson, AZ 85721 USA
11.Harvard Smithsonian Ctr Astrophys, Cambridge, MA 02138 USA
12.Chinese Acad Sci, Natl Astron Observ, Beijing 100012, Peoples R China
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GB/T 7714
Gal-Yam, A.,Mazzali, P.,Ofek, E. O.,et al. Supernova 2007bi as a pair-instability explosion[J]. NATURE,2009,462(7273):624-627.
APA Gal-Yam, A..,Mazzali, P..,Ofek, E. O..,Nugent, P. E..,Kulkarni, S. R..,...&Deng, J..(2009).Supernova 2007bi as a pair-instability explosion.NATURE,462(7273),624-627.
MLA Gal-Yam, A.,et al."Supernova 2007bi as a pair-instability explosion".NATURE 462.7273(2009):624-627.
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