论文标题
首先使用VLTI/Matisse的热卵形尘埃检测
First L band detection of hot exozodiacal dust with VLTI/MATISSE
论文作者
论文摘要
我们第一次观察到L条带中热的外生粉尘的发射。我们在非常大的望远镜干涉仪上使用了新的仪器Matisse来检测$κ$ tuc左右的热灰尘，其显着性在3.37至3.37至3.85 $ $ $ m和3.37 $ $ m且尘埃与明星的粉尘范围比为5至7％之间的波长为3 $σ$至6 $σ$。我们基于单独的新L频段数据并与前面发布的h频段数据结合使用了光谱能分布。在所有情况下，我们都会发现0.58 $ m $ m的无定形碳晶粒以适合$κ$ tuc观测值，但是，纳米或微米谷物和其他碳氧气或其他碳或硅酸盐也很好地繁殖了观测值。由于h频段数据揭示了时间变异性，而我们的L频段数据是在不同的时期获取的，因此我们以不同的方式将它们结合在一起。根据方法的不同，在0.1至0.29 au范围内的恒星距离处获得最佳拟合，因此在940至1430 K之间，在1 $σ$不确定性的灰尘位置和温度限制为0.032-1.18 au和600-2000 -k。
For the first time we observed the emission of hot exozodiacal dust in L band. We used the new instrument MATISSE at the Very Large Telescope Interferometer to detect the hot dust around $κ$ Tuc with a significance of 3$σ$ to 6$σ$ at wavelengths between 3.37 and 3.85 $μ$m and a dust-to-star flux ratio of 5 to 7 %. We modelled the spectral energy distribution based on the new L band data alone and in combination with H band data published previously. In all cases we find 0.58 $μ$m grains of amorphous carbon to fit the $κ$ Tuc observations the best, however, also nanometre or micrometre grains and other carbons or silicates reproduce the observations well. Since the H band data revealed a temporal variability, while our L band data were taken at a different epoch, we combine them in different ways. Depending on the approach, the best fits are obtained for a narrow dust ring at a stellar distance in the 0.1 to 0.29 au range and thus with a temperature between 940 and 1430 K. Within the 1$σ$ uncertainty dust location and temperature are confined to 0.032 - 1.18 au and 600 - 2000 K.
