论文标题
与10.4-m GTC和3.6-m TNG望远镜的星际彗星2i/Borisov的可见和近红外观测
Visible and near-infrared observations of interstellar comet 2I/Borisov with the 10.4-m GTC and the 3.6-m TNG telescopes
论文作者
论文摘要
在这项工作中，我们介绍了对2i/borisov进行的观察性研究的结果，该研究与10.4 m Gran Telescopio Canarias（GTC）和3.6-M Telescopio Nazionale Galileo（TNG），均位于位于La La Palma岛的Roque de Los te Los Moventeratory，这两个望远镜。该研究包括在可见光和近红外的图像，以及3600-9200 A波长范围内的可见光谱。还进行了N体模拟以探索其轨道演化和银河运动环境。彗星的尘埃连续体和近红外颜色与太阳系彗星观察到的粉色兼容。从2019年晚上，9月24日和26日的夜晚，我们测量了CN气体产量Q（CN）=（2.3 +-0.4）x 10^{24} mol/s和Q（CN）=（CN）=（9.5 +-0.2）x 10^{24} mol/s，与其他授权人在类似幕后报告的测量值一致。我们还获得了Q（C2）<（4.5 +-0.1）x 10^{24} mol/s的C2生产率的上限。灰尘建模结果表明，在许多彗星报道的范围内，在HeliIpric的距离R_H = 2.6 AU时，中心距离为2.6 au的中等灰尘生产率约为50 kg/s。我们的模拟表明，2i/borisov的银河速度与太阳邻居中的已知恒星以及银河盘更遥远的区域的恒星相匹配。
In this work, we present the results of an observational study of 2I/Borisov carried out with the 10.4-m Gran Telescopio Canarias (GTC) and the 3.6-m Telescopio Nazionale Galileo (TNG), both telescopes located at the Roque de Los Muchachos Observatory, in the island of La Palma (Spain). The study includes images in the visible and near-infrared, as well as visible spectra in the 3600 - 9200 A wavelength range. N-body simulations were also performed to explore its orbital evolution and Galactic kinematic context. The comet's dust continuum and near-infrared colours are compatible with those observed for Solar system comets. From its visible spectrum on the nights of 2019, September 24 and 26 we measured CN gas production rates Q(CN) = (2.3 +- 0.4) x 10^{24} mol/s and Q(CN) = (9.5 +- 0.2) x 10^{24} mol/s, respectively, in agreement with measurements reported by other authors on similar nights. We also obtained an upper limit for the C2 production rate of Q(C2) < (4.5 +- 0.1) x 10^{24} mol/s. Dust modelling results indicate a moderate dust production rate of about 50 kg/s at heliocentric distance r_h=2.6 au, with a differential power-law dust size distribution of index -3.4, within the range reported for many comet comae. Our simulations show that the Galactic velocity of 2I/Borisov matches well that of known stars in the solar neighbourhood and also those of more distant regions of the Galactic disc.
