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arXiv 0910.5597astro-ph.COastro-ph.SR
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SDSS-II超新星巡天和标准化烛光法中的II-P型超新星

Type II-P Supernovae from the SDSS-II Supernova Survey and the Standardized Candle Method

Chris B. D'Andrea, Masao Sako, Benjamin Dilday, Joshua A. Frieman, Jon Holtzman, Richard Kessler, Kohki Konishi, Donald P. Schneider, Jesper Sollerman, J. C. Wh… 展开作者

Chris B. D'Andrea, Masao Sako, Benjamin Dilday, Joshua A. Frieman, Jon Holtzman, Richard Kessler, Kohki Konishi, Donald P. Schneider, Jesper Sollerman, J. C. Wheeler, Naoki Yasuda, David Cinabro, Saurabh Jha, Robert C. Nichol, Hubert Lampeitl, Mathew Smith, David W. Atlee, Bruce Basset, Francisco J. Castander, Ariel Goobar, Ramon Miquel, Jakob Nordin, Linda Östman, Jose Luis Prieto, Robert Quimby, Adam G. Riess, Maximilian Stritzinger

摘要:

我们应用标准化蜡烛方法(SCM)的II型高原超新星(SNe II-P),它涉及到的SN的喷出物的速度,其在高原期间的光度,15 SNe II-P发现在三个赛季运行的斯隆数字巡天- II超新星调查。这些SNe - 0.027 < z < 0.144 -的红移覆盖了迄今为止文献中稀疏采样的范围;特别是,我们的SNe II-P样本在哈勃流中包含的SNe(z > 0.01)几乎与所有当前关于SCM的文献的总和一样多。我们发现,SDSS SNe有一个非常小的本征I带色散(0.22等),这可以归因于选择效应。当SCM应用于SNe II-P的组合SDSS加文献集时,分散度增加到0.29等,大于单独使用SNe的分散度。我们发现,标准化不能通过消除具有正平台下降率的SNe来进一步改善,如Poznanski等人(2009)所提出的。我们彻底检查所有潜在的系统性影响,并得出结论,SCM是有用的宇宙学,目前用于确定Fe II速度在第50天的方法必须加以改进,光谱模板,能够涵盖的内在变化的II-P型SNe将是必要的。

英文摘要:

We apply the Standardized Candle Method (SCM) for Type II Plateau supernovae (SNe II-P), which relates the velocity of the ejecta of a SN to its luminosity during the plateau, to 15 SNe II-P discovered over the three season run of the Sloan Digital Sky Survey - II Supernova Survey. The redshifts of these SNe - 0.027 < z < 0.144 - cover a range hitherto sparsely sampled in the literature; in particular, our SNe II-P sample contains nearly as many SNe in the Hubble flow (z > 0.01) as all of the current literature on the SCM combined. We find that the SDSS SNe have a very small intrinsic I-band dispersion (0.22 mag), which can be attributed to selection effects. When the SCM is applied to the combined SDSS-plus-literature set of SNe II-P, the dispersion increases to 0.29 mag, larger than the scatter for either set of SNe separately. We show that the standardization cannot be further improved by eliminating SNe with positive plateau decline rates, as proposed in Poznanski et al. (2009). We thoroughly examine all potential systematic effects and conclude that for the SCM to be useful for cosmology, the methods currently used to determine the Fe II velocity at day 50 must be improved, and spectral templates able to encompass the intrinsic variations of Type II-P SNe will be needed.

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