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arXiv 1008.2674astro-ph.SR
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超亮光学瞬变与Ic型超新星有关

Ultra-bright optical transients are linked with type Ic supernovae

A. Pastorello, S. J. Smartt, M. T. Botticella, K. Maguire, M. Fraser, K. Smith, R. Kotak, L. Magill, S. Valenti, D. R. Young, S. Gezari, F. Bresolin, R. Kudritz… 展开作者

A. Pastorello, S. J. Smartt, M. T. Botticella, K. Maguire, M. Fraser, K. Smith, R. Kotak, L. Magill, S. Valenti, D. R. Young, S. Gezari, F. Bresolin, R. Kudritzki, D. A. Howell, A. Rest, N. Metcalfe, S. Mattila, E. Kankare, K. Y. Huang, Y. Urata, W. S. Burgett, K. C. Chambers, T. Dombeck, T. Flewelling, T. Grav, J. N. Heasley, K. W. Hodapp, N. Kaiser, G. A. Luppino, R. H. Lupton, E. A. Magnier, D. G. Monet, J. S. Morgan, P. M. Onaka, P. A. Price, P. H. Rhoads, W. A. Siegmund, C. W. Stubbs, W. E. Sweeney, J. L. Tonry, R. J. Wainscoat, M. F. Waterson, C. Waters, C. G. Wynn-Williams

摘要:

最近的搜索无偏,宽场调查发现了一组非常明亮的光学瞬变。SN 2005 ap最初是由德克萨斯州超新星搜索和SCP-06 F6在哈勃笔形波束深度调查中发现的,随后帕洛玛瞬变工厂确认了其他类似瞬变的主机红移。瞬变具有高光学亮度(峰值幅度~ -21至-23)、蓝色和缺乏H或He光谱特征的共同特性。产生这种亮度的物理机制还不确定,从喷流驱动的爆炸到脉动对不稳定性。在这里,我们报告了最详细的光度和光谱覆盖的超亮瞬变(SN 2010 gx)在泛星1巡天检测。在共同与其他瞬变在这个家庭中,早期的光谱显示出一个蓝色的连续,和突出的广泛的吸收线O II。然而,在发现后约25天,光谱发展出Ic型超新星的特徴,显示出特征性的宽Fe II和Si II吸收线。详细的,极大期后的后续可能会显示所有SN 2005 ap和SCP-06 F6类型的瞬变都与超新星Ic有关。这给理解爆炸的物理学带来了问题:晚期测光没有迹象表明光度是由56 Ni提供动力的,宽的光变曲线表明有非常大的喷射质量,并且缓慢的光谱演化与典型的Ic时间尺度完全不同。祖先恒星的性质和光度的起源是有趣的和开放的问题。

英文摘要:

Recent searches by unbiased, wide-field surveys have uncovered a group of extremely luminous optical transients. The initial discoveries of SN 2005ap by the Texas Supernova Search and SCP-06F6 in a deep Hubble pencil beam survey were followed by the Palomar Transient Factory confirmation of host redshifts for other similar transients. The transients share the common properties of high optical luminosities (peak magnitudes ~ -21 to -23), blue colors, and a lack of H or He spectral features. The physical mechanism that produces the luminosity is uncertain, with suggestions ranging from jet-driven explosion to pulsational pair-instability. Here we report the most detailed photometric and spectral coverage of an ultra-bright transient (SN 2010gx) detected in the Pan-STARRS 1 sky survey. In common with other transients in this family, early-time spectra show a blue continuum, and prominent broad absorption lines of O II. However, about 25d after discovery, the spectra developed type Ic supernova features, showing the characteristic broad Fe II and Si II absorption lines. Detailed, post-maximum follow-up may show that all SN 2005ap and SCP-06F6 type transients are linked to supernovae Ic. This poses problems in understanding the physics of the explosions: there is no indication from late-time photometry that the luminosity is powered by 56Ni, the broad lightcurves suggest very large ejected masses, and the slow spectral evolution is quite different from typical Ic timescales. The nature of the progenitor stars and the origin of the luminosity are intriguing and open questions.

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