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| Format: | Preprint |
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2024
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| Online Access: | https://arxiv.org/abs/2403.09464 |
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| _version_ | 1866917634834956288 |
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| author | Yuan, Ye Zhang, Chen Li, Fan Chen, Jian Fu, Yanning Bai, Chunhai Gao, Xing Wang, Yong Zhong, Tuhong Gao, Yixing Wang, Liang Chen, Donghua Zhang, Yixing Zhang, Yang Xie, Wenpeng Zhang, Shupi Liu, Ding Cao, Jun Yin, Xiangdong Mo, Xiaojun Liu, Jing Han, Xinru Liu, Tong Chen, Yuqiang Gao, Zhendong Zeng, Xiang Niu, Guihua Zheng, Xiansheng Lin, Yuchen Ye, Peiyu Liang, Weitang Zhu, Chengcheng Hu, Zhiqiang He, Jianguo Zhang, Wei Chen, Yue Cheng, Zhuo Zhang, Yang Sun, Tianrui Guo, Chenyang Lu, Yue Lin, Jiajun Tan, Wei Zhou, Jia Xu, Jun He, Jun Ye, Jiahui Li, Delai Zhang, Shuai Qu, Qingyue |
| author_facet | Yuan, Ye Zhang, Chen Li, Fan Chen, Jian Fu, Yanning Bai, Chunhai Gao, Xing Wang, Yong Zhong, Tuhong Gao, Yixing Wang, Liang Chen, Donghua Zhang, Yixing Zhang, Yang Xie, Wenpeng Zhang, Shupi Liu, Ding Cao, Jun Yin, Xiangdong Mo, Xiaojun Liu, Jing Han, Xinru Liu, Tong Chen, Yuqiang Gao, Zhendong Zeng, Xiang Niu, Guihua Zheng, Xiansheng Lin, Yuchen Ye, Peiyu Liang, Weitang Zhu, Chengcheng Hu, Zhiqiang He, Jianguo Zhang, Wei Chen, Yue Cheng, Zhuo Zhang, Yang Sun, Tianrui Guo, Chenyang Lu, Yue Lin, Jiajun Tan, Wei Zhou, Jia Xu, Jun He, Jun Ye, Jiahui Li, Delai Zhang, Shuai Qu, Qingyue |
| contents | The atmosphere of Triton was probed directly by observing a ground-based stellar occultation on 6 October 2022. This rare event yielded 23 positive light curves collected from 13 separate observation stations contributing to our campaign. The significance of this event lies in its potential to directly validate the modest pressure fluctuation on Triton, a phenomenon not definitively verified by previous observations, including only five stellar occultations, and the Voyager 2 radio occultation in 1989. Using an approach consistent with a comparable study, we precisely determined a surface pressure of $14.07_{-0.13}^{+0.21}~\mathrm{μbar}$ in 2022. This new pressure rules out any significant monotonic variation in pressure between 2017 and 2022 through direct observations, as it is in alignment with the 2017 value. Additionally, both the pressures in 2017 and 2022 align with the 1989 value. This provides further support for the conclusion drawn from the previous volatile transport model simulation, which is consistent with the observed alignment between the pressures in 1989 and 2017; that is to say, the pressure fluctuation is modest. Moreover, this conclusion suggests the existence of a northern polar cap extended down to at least $45^\circ$N$-60^\circ$N and the presence of nitrogen between $30^\circ$S and $0^\circ$. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2403_09464 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | New constraints on Triton's atmosphere from the 6 October 2022 stellar occultation Yuan, Ye Zhang, Chen Li, Fan Chen, Jian Fu, Yanning Bai, Chunhai Gao, Xing Wang, Yong Zhong, Tuhong Gao, Yixing Wang, Liang Chen, Donghua Zhang, Yixing Zhang, Yang Xie, Wenpeng Zhang, Shupi Liu, Ding Cao, Jun Yin, Xiangdong Mo, Xiaojun Liu, Jing Han, Xinru Liu, Tong Chen, Yuqiang Gao, Zhendong Zeng, Xiang Niu, Guihua Zheng, Xiansheng Lin, Yuchen Ye, Peiyu Liang, Weitang Zhu, Chengcheng Hu, Zhiqiang He, Jianguo Zhang, Wei Chen, Yue Cheng, Zhuo Zhang, Yang Sun, Tianrui Guo, Chenyang Lu, Yue Lin, Jiajun Tan, Wei Zhou, Jia Xu, Jun He, Jun Ye, Jiahui Li, Delai Zhang, Shuai Qu, Qingyue Earth and Planetary Astrophysics The atmosphere of Triton was probed directly by observing a ground-based stellar occultation on 6 October 2022. This rare event yielded 23 positive light curves collected from 13 separate observation stations contributing to our campaign. The significance of this event lies in its potential to directly validate the modest pressure fluctuation on Triton, a phenomenon not definitively verified by previous observations, including only five stellar occultations, and the Voyager 2 radio occultation in 1989. Using an approach consistent with a comparable study, we precisely determined a surface pressure of $14.07_{-0.13}^{+0.21}~\mathrm{μbar}$ in 2022. This new pressure rules out any significant monotonic variation in pressure between 2017 and 2022 through direct observations, as it is in alignment with the 2017 value. Additionally, both the pressures in 2017 and 2022 align with the 1989 value. This provides further support for the conclusion drawn from the previous volatile transport model simulation, which is consistent with the observed alignment between the pressures in 1989 and 2017; that is to say, the pressure fluctuation is modest. Moreover, this conclusion suggests the existence of a northern polar cap extended down to at least $45^\circ$N$-60^\circ$N and the presence of nitrogen between $30^\circ$S and $0^\circ$. |
| title | New constraints on Triton's atmosphere from the 6 October 2022 stellar occultation |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2403.09464 |