论文标题
Carnegie Supernova Project-II：一种新的方法来识别极端型超新星的子类型
Carnegie Supernova Project-II: A new method to photometrically identify sub-types of extreme Type Ia Supernovae
论文作者
论文摘要
我们提出了一种新的方法，可以在IA型超新星（SNE IA）的各种亚类型之间进行光学描绘。使用颜色拉伸参数，$ s_ {bv} $或$ s_ {gr} $，以及I波段主要最大时间相对于B波段或G频段最大值的时间，证明了2003fg Like，1991bg Like，以及2002CX类似的SNE IA可以很容易地识别。在这些极端SNE IA的情况下，它们的主要I带最大值发生在B或G带最大值的时间之后。我们建议，I-Band最大值的时机可以揭示SN IA爆炸的物理状态：i）弹出中铁组元素的重组速度的速度，ii）弹出中的温度演化和绝热冷却的速度，以及III）与Stellar Invelope相互作用的存在。该光度亚型可以与其他SNE分析（例如分支图）结合使用，以检查SNE IA的物理和多样性。此处的结果也可用于从没有完整的光谱键入的宇宙样品中筛选出非IA SNE。最后，随着未来的调查（如LSST）创建了许多对象的光曲线的大数据库，因此可以使用该光度识别来轻松识别和研究特殊SNE IA的速率和批量特性。
We present a new method to photometrically delineate between various sub-types of type Ia supernovae (SNe Ia). Using the color-stretch parameters, $s_{BV}$ or $s_{gr}$, and the time of i-band primary maximum relative to the B-band or g-band maximum it is demonstrated that 2003fg-like, 1991bg-like, and 2002cx-like SNe Ia can readily be identified. In the cases of these extreme SNe Ia, their primary i-band maximum occurs after the time of the B or g band maxima. We suggest that the timing of the i-band maximum can reveal the physical state of the SN Ia explosion as it traces: i) the speed of the recombination front of iron group elements in the ejecta, ii) the temperature evolution and rate of adiabatic cooling in the ejecta and, iii) the presence of interaction with a stellar envelope. This photometric sub-typing can be used in conjunction with other SNe analysis, such as the Branch diagram, to examine the physics and diversity of SNe Ia. The results here can also be used to screen out non-Ia SNe from cosmological samples that do not have complete spectroscopic typing. Finally, as future surveys like LSST create large databases of light curves of many objects this photometric identification can be used to readily identify and study the rates and bulk properties of peculiar SNe Ia.
