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arXiv 1202.5301astro-ph.COastro-ph.SR
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一颗Ia型超新星的第一次紫外-近红外光谱

The First Maximum-Light Ultraviolet through Near-Infrared Spectrum of a Type Ia Supernova

Ryan J. Foley, Markus Kromer, G. Howie Marion, Giuliano Pignata, Maximilian D. Stritzinger, Stefan Taubenberger, Peter Challis, Alexei V. Filippenko, Gaston Fol… 展开作者

Ryan J. Foley, Markus Kromer, G. Howie Marion, Giuliano Pignata, Maximilian D. Stritzinger, Stefan Taubenberger, Peter Challis, Alexei V. Filippenko, Gaston Folatelli, Wolfgang Hillebrandt, Eric Y. Hsiao, Robert P. Kirshner, Weidong Li, Nidia I. Morrell, Friedrich K. Roepke, Franco Ciaraldi-Schoolmann, Ivo R. Seitenzahl, Jeffrey M. Silverman, Robert A. Simcoe, Zachory K. Berta, Kevin M. Ivarsen, Elisabeth R. Newton, Melissa C. Nysewander, Daniel E. Reichart

摘要:

我们提出了第一个最大光紫外(UV)到近红外(NIR)Ia型超新星(SN Ia)光谱。SN 2011 iv的光谱几乎是同时由哈勃太空望远镜在紫外/光学波长和麦哲伦巴德望远镜在近红外波长获得的。这些数据提供了研究整个最大光超新星Ia光谱能量分布的机会。由于超新星Ia光谱的紫外区对爆炸外层的成分极其敏感,而爆炸外层在较长波长下是透明的,因此这种前所未有的光谱可以对超新星喷出物的成分以及类似的超新星爆炸和祖先系统提供强有力的限制。SN 2011 iv光谱正常,但衰减相对较快(Δ m_15(B)= 1.69 +/- 0.05等)。我们比较SN 2011 iv与其他超新星Ia的紫外光谱接近最大的光,并研究紫外光谱特性,光曲线形状和喷出物的速度之间的趋势。我们初步发现,具有相似的光变曲线形状,但不同的喷出物的速度有相似的紫外光谱,而那些具有相似的喷出物的速度,但不同的光变曲线形状有很大的不同的紫外光谱。通过与爆炸模型的比较,我们发现太阳能金属丰度W7和零金属丰度延迟爆轰模型都提供了一个合理的拟合SN 2011 iv的光谱从紫外到近红外。

英文摘要:

We present the first maximum-light ultraviolet (UV) through near-infrared (NIR) Type Ia supernova (SN Ia) spectrum. This spectrum of SN 2011iv was obtained nearly simultaneously by the Hubble Space Telescope at UV/optical wavelengths and the Magellan Baade telescope at NIR wavelengths. These data provide the opportunity to examine the entire maximum-light SN Ia spectral-energy distribution. Since the UV region of a SN Ia spectrum is extremely sensitive to the composition of the outer layers of the explosion, which are transparent at longer wavelengths, this unprecedented spectrum can provide strong constraints on the composition of the SN ejecta, and similarly the SN explosion and progenitor system. SN 2011iv is spectroscopically normal, but has a relatively fast decline (Delta m_15 (B) = 1.69 +/- 0.05 mag). We compare SN 2011iv to other SNe Ia with UV spectra near maximum light and examine trends between UV spectral properties, light-curve shape, and ejecta velocity. We tentatively find that SNe with similar light-curve shapes but different ejecta velocities have similar UV spectra, while those with similar ejecta velocities but different light-curve shapes have very different UV spectra. Through a comparison with explosion models, we find that both a solar-metallicity W7 and a zero-metallicity delayed-detonation model provide a reasonable fit to the spectrum of SN 2011iv from the UV to the NIR.

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