C/2013 R1彗星（洛夫乔伊）的成像偏振和分光偏振测量
Imaging polarimetry and spectropolarimetry of comet C/2013 R1 (Lovejoy)
摘要：
我们在保加利亚国家天文台罗真的2米Ritchey-Chrétien-Coudé望远镜上用2-Focal-Reducer Rozhen仪器获得了彗星C/2013 R1（Lovejoy）的成像偏振测量，两个尘埃连续滤光片覆盖了分子发射的波长间隔，中心位于$4430Å$ in（蓝色滤光片）和$6840Å$ in（红色滤光片）。在成像模式下，我们测量了蓝色的线性偏振度$17.01\pm0.09$ %和红色的$18.81\pm0.02$ %，这与其他彗星在类似相位角下的测量结果非常一致。我们还获得了偏振图在这两个过滤器。我们发现偏振的空间分布和尘埃颜色之间有很强的相关性。核区域的分光偏振测定显示出偏振随波长的增加，以及在具有气体发射线的光谱区域中的去偏振，在C $_2$发射带中最明显，其显示出$6.0\pm1.1$ %的偏振。
英文摘要：
We have obtained imaging polarimetry of the comet C/2013 R1 (Lovejoy) with 2-Channel-Focal-Reducer Rozhen instrument at 2m Ritchey-Chrétien-Coudé telescope of the Bulgarian National Astronomical Observatory Rozhen in two dust continuum filters covering wavelength intervals clear from molecular emissions and centred at $4430Å$ in (blue filter) and at $6840Å$ in (red filter). In imaging mode we measured the degree of linear polarisation $17.01\pm0.09$% in the blue and $18.81\pm0.02$% in the red, which is in a very good agreement with measurements of other comets at the similar phase angle. We have also obtained polarisation maps in both filters. We found a strong correlation between the spatial distribution of the polarisation and the dust colour. Spectropolarimetry of the nucleus region shows an increase of the polarisation with wavelength, and a depolarisation in the spectral regions with gas emission lines, most noticeable in C$_2$ emission band, which shows a polarisation of $6.0\pm1.1$%.
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