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arXiv 0906.4085astro-ph.CO
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Ia型超新星的近红外光谱表

A Catalog of Near Infrared Spectra from Type Ia Supernovae

G. H. Marion, P. Hoeflich, C. L. Gerardy, W. D. Vacca, J. C. Wheeler, E. L. Robinson

摘要:

我们目前的41个近红外(NIR,0.7-2.5微米)光谱从正常Ia型超新星(SNe Ia)获得的时期从十四天前到七十五天的最大光日期在V波段。所有数据均在IRTF使用SpeX仪器获得。我们确定了许多光谱特征,测量了多普勒速度,并讨论了超新星Ia爆炸产物的化学分布。我们描述了平滑数据,拟合连续和测量吸收特性,以确保测量和分析的一致性的程序。该样品提供了第一次机会,以检查和比较大量的Ia超新星在这个波长范围。近红外数据是关于爆炸产物的丰富信息来源,这些产物的特征在其他光谱区被混合或模糊,近红外观测探测的径向深度大于光学波长。我们分析了光谱的相似性和差异,我们表明,正常超新星Ia在近红外光谱的光谱特征的逐步发展是一致的时间。测量的多普勒速度表明,在超新星Ia燃烧产物分布在不同的层,没有大规模的混合。在这些数据中没有检测到碳,与以前的结果一致,近红外数据建立了非常低的限制在超新星Ia的碳丰度。碳燃烧产物,O和Mg,在外层丰富,表明整个祖在爆炸中燃烧。这些数据为研究与其他数据库的互相关提供了资源,这些数据库可能进一步限制超新星Ia的物理学,并提高超新星Ia作为宇宙学距离指标的有效性。

英文摘要:

We present forty-one near infrared (NIR, 0.7-2.5 microns) spectra from normal Type Ia supernovae (SNe Ia) obtained at epochs ranging from fourteen days before to seventy-five days with respect to the maximum light date in the V-band. All data were obtained at the IRTF using the SpeX instrument. We identify many spectral features, measure the Doppler velocities, and discuss the chemical distribution of explosion products in SNe Ia. We describe procedures for smoothing data, fitting continua, and measuring absorption features to insure consistency for measurement and analysis. This sample provides the first opportunity to examine and compare a large number of SNe Ia in this wavelength region. NIR data are a rich source of information about explosion products whose signatures are blended or obscured in other spectral regions and NIR observations probe a greater radial depth than optical wavelengths. We analyze similarities and differences in the spectra and we show that the progressive development of spectral features for normal SNe Ia in the NIR is consistent with time. Measured Doppler velocities indicate that burning products in SNe Ia are distributed in distinct layers with no large scale mixing. Carbon is not detected in these data, in agreement with previous results with NIR data establishing very low limits on carbon abundance in SNe Ia. Carbon burning products, O and Mg, are plentiful in the outer layers suggesting that the entire progenitor is burned in the explosion. The data provide a resource for investigations of cross-correlations with other data libraries that may further constrain SN Ia physics and improve the effectiveness of SNe Ia as cosmological distance indicators.

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