SN 2002 cv：一颗被严重遮蔽的Ia型超新星
SN 2002cv: A Heavily Obscured Type Ia Supernova
摘要：
我们目前VRIJHK测光，光学和近红外光谱，严重熄灭Ia型超新星（SN）2002 cv，位于NGC 3190，这也是母星系Ia型SN 2002 bo。SN 2002 cv在蓝色区域不可见，其总消光值为8.74 ± 0.21 mag.尽管如此，我们还是能够获得I波段最大值-10天至+207天之间的光变曲线，并跟踪光谱演变，推导出其关键参数。我们发现I波段亮度峰值为Imax = 16.57 ± 0.10等，最大绝对I星等为MmaxI = -18.79 ± 0.20，以及参数dm 15（B），指定B波段光变曲线的宽度为1.46 +-0.17mag。后者是使用该参数与dm 40（I）之间的关系推导出来的以及I波段光变曲线中两个最大值之间的时间间隔dtmax（I）。正如先前观测到的高度熄灭的Ia超新星一样，SN 2002 cv的总消光比与选择消光比的比值Rv为1.59 ± 0.07，这意味着沿着我们的视线，粒子的平均尺寸很小。由于SN 2002 bo的典型值为3.1，因此我们在这里提供了NGC 3190内部不同尘埃性质的明确证据。
英文摘要：
We present VRIJHK photometry, and optical and near-infrared spectroscopy, of the heavily extinguished Type Ia supernova (SN) 2002cv, located in NGC 3190, which is also the parent galaxy of the Type Ia SN 2002bo. SN 2002cv, not visible in the blue, has a total visual extinction of 8.74 +- 0.21 mag. In spite of this we were able to obtain the light curves between -10 and +207 days from the maximum in the I band, and also to follow the spectral evolution, deriving its key parameters. We found the peak I-band brightness to be Imax = 16.57 +- 0.10 mag, the maximum absolute I magnitude to be MmaxI = -18.79 +- 0.20, and the parameter dm15(B) specifying the width of the B-band light curve to be 1.46 +- 0.17 mag. The latter was derived using the relations between this parameter and dm40(I) and the time interval dtmax(I) between the two maxima in the I-band light curve. As has been found for previously observed, highly extinguished SNe Ia, a small value of 1.59 +- 0.07 was obtained here for the ratio Rv of the total-to-selective extinction ratio for SN 2002cv, which implies a small mean size for the grains along the line of sight toward us. Since it was found for SN 2002bo a canonical value of 3.1, here we present a clear evidence of different dust properties inside NGC 3190.
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