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arXiv 0912.3111astro-ph.SRastro-ph.CO
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SN 2004 et的光学和近红外覆盖:物理参数和与其他类型IIP超新星的比较

Optical and near infrared coverage of SN 2004et: physical parameters and comparison with other type IIP supernovae

K. Maguire, E. Di Carlo, S. J. Smartt, A. Pastorello, D. Yu. Tsvetkov, S. Benetti, S. Spiro, A. A. Arkharov, G. Beccari, M. T. Botticella, E. Cappellaro, S. Cri… 展开作者

K. Maguire, E. Di Carlo, S. J. Smartt, A. Pastorello, D. Yu. Tsvetkov, S. Benetti, S. Spiro, A. A. Arkharov, G. Beccari, M. T. Botticella, E. Cappellaro, S. Cristallo, M. Dolci, N. Elias-Rosa, M. Fiaschi, Gorshanov D., A. Harutyunyan, V. M. Larionov, H. Navasardyan, A. Pietrinferni, G. Raimondo, G. Di Rico, S. Valenti, G. Valentini, L. Zampieri

摘要:

我们提出了新的光学和近红外(NIR)测光和光谱的类型IIP超新星,SN 2004 et。结合已经发表的数据,这提供了从爆炸后到+500天的任何类型的IIP SN的光学和近红外数据的最完整的研究之一。近红外辐射通量对辐射热光变曲线的贡献估计从爆发时的15%增加到平台期结束时的50%左右,然后在300天时下降到40%。SN 2004 et是目前研究最多的IIP SNe之一,其亮度为log L = 42.3 erg/s,比SN 1999 em亮2倍。我们提供了SN 2004 et和其他三个具有广泛的光学和近红外数据的IIP SNe的参数化热辐射校正作为时间的函数,这些数据可用作未来事件的模板。我们将SN 2004 et的物理参数与其他IIP SNe的物理参数进行了比较,发现其动能范围为10^50-10^51尔格。我们比较了从流体动力学模型计算出的喷射质量与来自发现前图像的祖质量和限制。一些喷出的质量估计值明显高于祖先的质量估计值,SN 2004 et可能显示出最严重的质量差异。用目前的模型,似乎很难将100天的平台长度和高膨胀速度与7-8个Msun祖先所暗示的5-6个Msun的低喷射质量相协调。星云阶段的研究使用非常晚的时间HST测光,随着光学和近红外光谱。光变曲线在600天的光学和近红外光谱中显示出明显的平坦化,这可能是由于喷出物撞击CSM。我们进一步指出,四种类型的IIP SNe的[Oi] 6300、6364埃谱线强度暗示着喷出的氧质量为0.5- 1.5Msun。

英文摘要:

We present new optical and near infrared (NIR) photometry and spectroscopy of the type IIP supernova, SN 2004et. In combination with already published data, this provides one of the most complete studies of optical and NIR data for any type IIP SN from just after explosion to +500 days. The contribution of the NIR flux to the bolometric light curve is estimated to increase from 15% at explosion to around 50% at the end of the plateau and then declines to 40% at 300 days. SN 2004et is one of the most luminous IIP SNe which has been well studied, and with a luminosity of log L = 42.3 erg/s, it is 2 times brighter than SN 1999em. We provide parametrised bolometric corrections as a function of time for SN 2004et and three other IIP SNe that have extensive optical and NIR data, which can be used as templates for future events. We compare the physical parameters of SN 2004et with those of other IIP SNe and find kinetic energies spanning the range of 10^50-10^51 ergs. We compare the ejected masses calculated from hydrodynamic models with the progenitor masses and limits derived from prediscovery images. Some of the ejected mass estimates are significantly higher than the progenitor mass estimates, with SN 2004et showing perhaps the most serious mass discrepancy. With current models, it appears difficult to reconcile 100 day plateau lengths and high expansion velocities with the low ejected masses of 5-6 Msun implied from 7-8 Msun progenitors. The nebular phase is studied using very late time HST photometry, along with optical and NIR spectroscopy. The light curve shows a clear flattening at 600 days in the optical and the NIR, which is likely due to the ejecta impacting on the CSM. We further show that the [Oi] 6300,6364 Angstrom line strengths of four type IIP SNe imply ejected oxygen masses of 0.5-1.5 Msun.

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