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arXiv 1101.0635astro-ph.SR
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极亮Ic型超新星2007 bi的前身

A Progenitor for the Extremely Luminous Type Ic Supernova 2007bi

Takashi Yoshida, Hideyuki Umeda

摘要:

SN 2007 bi是一颗非常明亮的Ic型超新星。这颗超新星被认为是从一颗非常巨大的恒星演化而来的,爆炸机制有两种可能性。一种可能性是一颗对不稳定超新星,其核心祖先为M_{CO} ~ 100 M太阳CO。另一种可能性是一颗核心坍缩的超新星,其M_{CO}约为40 M太阳。研究了SN 2007 bi主星系金属丰度范围内,主序质量M_{MS} = 100 - 500 M_sun,Z_0 = 0.004的超大质量恒星的演化,以约束SN 2007 bi的祖先星系。本文还讨论了与表面氦丰度有关的超新星类型。母星作为对不稳定超新星爆发的主序星质量可能是M_{MS} ~ 515 - 575 M_sun。当考虑质量损失率的不确定性时,主序星的最小质量可能是310 M太阳。一颗M_{MS} ~ 110 - 280 M_sun的恒星演化为CO星,适合于SN 2007 bi的核心坍缩超新星。基于对不稳定性和核心坍缩超新星的可能性的论点支持SN 2007 bi起源于核心坍缩超新星事件的假设。

英文摘要:

SN 2007bi is an extremely luminous Type Ic supernova. This supernova is thought to be evolved from a very massive star, and two possibilities have been proposed for the explosion mechanism. One possibility is a pair-instability supernova with an M_{CO} ~ 100 M_sun CO core progenitor. Another possibility is a core-collapse supernova with M_{CO} ~ 40 M_sun. We investigate the evolution of very massive stars with main-sequence mass M_{MS} = 100 - 500 M_sun and Z_0 = 0.004, which is in the metallicity range of the host galaxy of SN 2007bi, to constrain the progenitor of SN 2007bi. The supernova type relating to the surface He abundance is also discussed. The main-sequence mass of the progenitor exploding as a pair-instability supernova could be M_{MS} ~ 515 - 575 M_sun. The minimum main-sequence mass could be 310 M_sun when uncertainties in the mass-loss rate are considered. A star with M_{MS} ~ 110 - 280 M_sun evolves to a CO star, appropriate for the core-collapse supernova of SN 2007bi. Arguments based on the probability of pair-instability and core-collapse supernovae favour the hypothesis that SN 2007bi originated from a core-collapse supernova event.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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