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arXiv 1409.2500astro-ph.SRastro-ph.HE
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II型高原超新星光变曲线和膨胀速度的全球模型

A Global Model of The Light Curves and Expansion Velocities of Type II-Plateau Supernovae

Ondrej Pejcha, Jose L. Prieto

摘要:

我们提出了一个新的自洽和通用的方法,推导出光球半径和温度变化的II型高原超新星的膨胀速度和光度测量的基础上。我们将该方法应用于26个观测良好的样本,附近的超新星与公布的光变曲线和速度。我们同时适合~230速度和~6800星等测量分布在21个光度通带,波长从0.19到2.2微米。II型高原超新星之间的光变曲线的差异是很好的模型,假设不同的光球半径膨胀率,我们解释为不同的密度分布的喷出物,我们认为,陡峭的密度分布导致平坦的高原,如果其他一切保持不变。II型线性超新星的光度急剧下降是由于光球温度的快速演变,我们验证了SN 1980 K的成功拟合。消除理论超新星大气模型的需要,我们得到自洽的相对距离,reddenings,和镍质量充分占所有内部模型的不确定性和协方差。我们使用我们的全球拟合估计的时间演化的任何失踪的波段专门为每个超新星,我们构建光谱能量分布和热光曲线。我们为样本中的所有滤波器组合生成热辐射校正。我们将我们的模型与理论稀释因子进行比较,发现B和V过滤器具有良好的一致性。当I、J、H或K带包括在内时,我们的结果与理论不同。我们研究了超新星的红化规律,发现在UBVRI波段与标准R_V ~ 3.1红化规律基本一致。其他条带的结果不确定。我们公开了我们的试衣规范。

英文摘要:

We present a new self-consistent and versatile method that derives photospheric radius and temperature variations of Type II-Plateau supernovae based on their expansion velocities and photometric measurements. We apply the method to a sample of 26 well-observed, nearby supernovae with published light curves and velocities. We simultaneously fit ~230 velocity and ~6800 magnitude measurements distributed over 21 photometric passbands spanning wavelengths from 0.19 to 2.2 microns. The light curve differences among the Type II-Plateau supernovae are well-modeled by assuming different rates of photospheric radius expansion, which we explain as different density profiles of the ejecta and we argue that steeper density profiles result in flatter plateaus, if everything else remains unchanged. The steep luminosity decline of Type II-Linear supernovae is due to fast evolution of the photospheric temperature, which we verify with a successful fit of SN1980K. Eliminating the need for theoretical supernova atmosphere models, we obtain self-consistent relative distances, reddenings, and nickel masses fully accounting for all internal model uncertainties and covariances. We use our global fit to estimate the time evolution of any missing band tailored specifically for each supernova and we construct spectral energy distributions and bolometric light curves. We produce bolometric corrections for all filter combinations in our sample. We compare our model to the theoretical dilution factors and find good agreement for the B and V filters. Our results differ from the theory when the I, J, H, or K bands are included. We investigate the reddening law towards our supernovae and find reasonable agreement with standard R_V ~ 3.1 reddening law in UBVRI bands. Results for other bands are inconclusive. We make our fitting code publicly available.

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