C/2017 K2(PanStarrs)彗星的测光、自转周期测定和尘埃彗星数值研究

IF 2.5 2区 物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Icarus Pub Date : 2024-08-21 DOI:10.1016/j.icarus.2024.116267
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引用次数: 0

摘要

C/2017 K2(Pan-STARRS)是2017年5月发现的一颗奥尔特云彗星。地面观测发现,这颗长周期彗星在日心距离超过20 au时十分活跃。一些研究在该天体远离太阳时对其进行了观测,并提出在这样的距离上,其活动主要由 CO 和 CO2 等超挥发性冰升华驱动。在2022年7月至8月期间,利用Complejo Astronómico El Leoncito(CASLEO)的0.6米Helen Sawyer Hogg(HSH)望远镜,使用宽带V和R滤光片,在不同的观测程序中拍摄了一系列图像。应用数字滤光片增强了彗星图像的对比度,揭示了嵌入各向同性彗星中的活动区域。此外,由于彗星图像的时间跨度较大,因此可以利用相位色散最小化方法(PDM)进行周期图分析,确定彗星的自转周期,并计算出自转轴的坐标,得出自转周期为 14.最后,为了更深入地了解 C/2017 K2 的尘埃行为,我们将观测结果与新开发的尘埃彗星研究理论模型进行了拟合。分析表明,该彗星的尘埃缨主要是由以180ms-1的速度喷出的大尘埃粒子形成的。
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Photometry, rotation period determination and dust coma numerical study of comet C/2017 K2 (PanStarrs)

C/2017 K2 (Pan-STARRS) is an Oort cloud comet discovered in May 2017. Ground observations have revealed that this long-period comet was active at a heliocentric distance beyond 20 au. Several studies observed this object when it was far from the Sun and proposed that, at such a distance, its activity is primarily driven by the sublimation of super-volatile ices such as CO and CO2.

The aim of this paper is to analyze the comet’s dust behavior when it was much closer to the Sun. A series of images were taken on different observation routines between July and August 2022 with the 0.6 m Helen Sawyer Hogg (HSH) telescope at the Complejo Astronómico El Leoncito (CASLEO), using broadband V and R filters. The objective was to conduct a morphological, photometric, and numerical analysis of this comet.

Digital filters were applied to enhance contrast in the cometary images, revealing an active region embedded within an isotropic coma. Analysis of the magnitudes and dust production rate from the A(0°)fρ parameter suggests a steady-state dust behavior, consistent with findings from other authors.

Moreover, thanks to the images covering a significant time span, it was possible to determine the comet’s rotation period using a periodogram analysis with the Phase Dispersion Minimization method (PDM) and to calculate the coordinates of the rotation axis, yielding a rotation period of 14.24 h with a pole situated at the ecliptic longitude and latitude of (244°,20°).

Finally, to gain deeper insights into C/2017 K2’s dust behavior, observations were fitted to a newly developed theoretical model for studying dust comas. The analysis suggests that the comet’s dust coma was principally formed by large dust particles emitted at a velocity of 180ms1.

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来源期刊
Icarus
Icarus 地学天文-天文与天体物理
CiteScore
6.30
自引率
18.80%
发文量
356
审稿时长
2-4 weeks
期刊介绍: Icarus is devoted to the publication of original contributions in the field of Solar System studies. Manuscripts reporting the results of new research - observational, experimental, or theoretical - concerning the astronomy, geology, meteorology, physics, chemistry, biology, and other scientific aspects of our Solar System or extrasolar systems are welcome. The journal generally does not publish papers devoted exclusively to the Sun, the Earth, celestial mechanics, meteoritics, or astrophysics. Icarus does not publish papers that provide "improved" versions of Bode''s law, or other numerical relations, without a sound physical basis. Icarus does not publish meeting announcements or general notices. Reviews, historical papers, and manuscripts describing spacecraft instrumentation may be considered, but only with prior approval of the editor. An entire issue of the journal is occasionally devoted to a single subject, usually arising from a conference on the same topic. The language of publication is English. American or British usage is accepted, but not a mixture of these.
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