Ibn型超新星SN 2006 jc直到尘埃形成开始的光学光度学和光谱学
Optical photometry and spectroscopy of the type Ibn supernova SN 2006jc until the onset of dust formation
摘要：
我们目前的光学UBVRI光度和光谱数据的类型Ibn超新星SN 2006 jc，直到开始的尘埃形成阶段。光谱显示出一个蓝色的连续谱，并由中等窄（速度~2500 km/s）的He I发射线叠加在一个相对较弱的超新星光谱的存在占主导地位。氦线是在一个预先存在的富氦拱壳中产生的。观测到的氦谱线通量表明星周壳层是致密的，密度约为10 ^9 - 10^{10} cm^{-3}。这个壳层中的氦质量估计<~0.07 Msun。光学光变曲线显示了尘埃形成的清晰特征，在第50天左右，星等急剧下降，伴随着颜色变红。在早期阶段的光学光变曲线的演变和在所有阶段的uvoir测辐射热光变曲线的演变是合理的类似于正常的Ib/c超新星。
英文摘要：
We present optical UBVRI photometric and spectroscopic data of the type Ibn supernova SN 2006jc, until the onset of the dust forming phase. The optical spectrum shows a blue continuum and is dominated by the presence of moderately narrow (velocity ~2500 km/s) He I emission lines superimposed over a relatively weak supernova spectrum. The helium lines are produced in a pre-existing He rich circumstellar shell. The observed helium line fluxes indicate the circumstellar shell is dense, with a density of ~10^9 - 10^{10} cm^{-3}. The helium mass in this shell is estimated to be <~0.07 Msun. The optical light curves show a clear signature of dust formation, indicated by a sharp decrease in the magnitudes around day 50, accompanied by a reddening of the colours. The evolution of the optical light curves during the early phase and that of the uvoir bolometric light curve at all phases is reasonably similar to normal Ib/c supernovae.
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