Changes in the longitude polarization dependence of Jupiter's moon Io as evidence of the long-term variability of its volcanic activity

IF 2.5 2区物理与天体物理 Q2 ASTRONOMY & ASTROPHYSICS Icarus Pub Date : 2024-10-24 DOI:10.1016/j.icarus.2024.116351

Nikolai N. Kiselev , Herman G. Dyachenko , Nikolai V. Karpov , Kirill A. Antoniuk

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Abstract

The aim of the work was to investigate the longitude (orbital) dependence of the polarization of Jupiter's moon Io and compare results of our study with what is reported in the literature. We used our published observations and supplemented them with new measurements carried out with the polarimeters mounted on the 2.6 m Shajn telescope of the Crimean Astrophysical Observatory and the 2 m telescope of the Peak Terskol Observatory in the UBVRI bands at phase angles between 10° and 12° in August 2023 – February 2024. We have determined that amplitude of the orbital polarization in the V band does not exceed ≈0.1 %. It is the deepest −0.17 ± 0.03 % at L ≈ 270° and the shallowest −0.07 ± 0.03 % near L ≈ 130°. These parameters differ markedly from that obtained by Zellner and Gradie (1975), which found that the orbital polarization variations from 0.4 to 0.5 % for α > 10°, and the negative branch is the deepest near L = 160° and the shallowest near L = 300°. These differences may be a consequence of changes in the reflective properties of the local areas of Io's surface due to long-term changes in Io's local or global volcanic activity.

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木星卫星木卫一经度极化依赖性的变化是其火山活动长期变化的证据

这项工作的目的是研究木星卫星木卫一偏振的经度（轨道）依赖性，并将我们的研究结果与文献报道的结果进行比较。我们使用了已发表的观测数据，并在 2023 年 8 月至 2024 年 2 月期间使用克里米亚天体物理观测站 2.6 米 Shajn 望远镜和峰顶 Terskol 观测站 2 米望远镜在 UBVRI 波段的 10°至 12°相位角范围内进行了新的测量。我们确定 V 波段的轨道极化振幅不超过 ≈0.1%。在 L≈270° 时，偏振幅度最深-0.17 ± 0.03 %，在 L≈130° 附近，偏振幅度最浅-0.07 ± 0.03 %。这些参数与 Zellner 和 Gradie（1975 年）得到的参数有明显不同，后者发现在 α > 10° 时轨道极化变化从 0.4% 到 0.5%，负分支在 L = 160° 附近最深，在 L = 300° 附近最浅。这些差异可能是由于木卫二局部或全球火山活动的长期变化导致木卫二表面局部区域反射特性发生变化的结果。

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来源期刊

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.