Pre-perihelion radio observations of comet 12P/Pons-Brooks with the Tianma Radio Telescope
文献类型：期刊论文
| 作者 | Li, Juncen1,6,7; Shi, Xian6; Shi, Jianchun6; Ma, Yuehua1,7; Yang, Bin5; Li, Jian-Yang4; Xing, Zexi6; Hui, Man-To6; Wang, Zhen3; Zhao, Ruining2 |
| 刊名 | ASTRONOMY & ASTROPHYSICS
 |
| 出版日期 | 2025-09-17 |
| 卷号 | 701页码:A204 |
| 关键词 | methods: observational comets: general comets: individual: 12P/Pons-Brooks |
| ISSN号 | 0004-6361 |
| DOI | 10.1051/0004-6361/202554867 |
| 产权排序 | 6 |
| 英文摘要 | Context. The multiple outburst events of comet 12P/Pons-Brooks during its 2024 apparition offer a unique window into highly active volatile releasing processes not observable during quiescent periods. Radio observations are capable of measuring specific cometary gas species, providing valuable insights into the chemical composition and activity mechanism of comets.Aims. We performed radio observations of comet 12P/Pons-Brooks with the Tianma 65 m Radio Telescope, targeting the OH and NH3 inversion lines at 18 and 1.3 cm, respectively. By monitoring 12P at different heliocentric distances on its inbound journey, we aim to provide insights into the comet's volatile composition and outburst behavior.Methods. Four observations were carried out between December 2023 and March 2024, when the comet was approaching the Sun from 2.22 to 1.18 AU. We conducted 18 cm OH lines observations on four separate days using the cryogenically cooled receiver system of the telescope to derive the H2O production rate. During 12P's outburst on December 14, we also conducted observations targeting the NH3 emission.Results. OH 18 cm lines were clearly detected with a signal-to-noise ratio of similar to 4 sigma (peak intensity), yielding estimates on corresponding water production rates of approximately 1029 molec. s-1. A tentative detection of NH3 was made at the similar to 3 sigma level during the outburst phase, but the detection needs to be verified.Conclusions. Our observations provide information on the outgassing behavior of 12P/Pons-Brooks during its 2024 apparition. The water production rate of 12P, derived from the 18 cm OH lines, is consistent with measurements obtained in other works. The possible detection of NH3 during an outburst suggests possible connections between the subsurface volatile reservoir and the outburst mechanism. These results could further our understanding of the composition and activity of Halley-type comets. |
| WOS关键词 | EXPANSION VELOCITY ; PRODUCTION-RATES ; WATER PRODUCTION ; AMMONIA ; FLUORESCENCE ; RESOLUTION ; SOLAR ; PHOTODISSOCIATION ; SPECTROSCOPY ; TRANSITIONS |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001575039600012 |
| 出版者 | EDP SCIENCES S A |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8172]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Shi, Xian; Ma, Yuehua |
| 作者单位 | 1.Univ Sci & Technol China, Sch Astron & Space Sci, Hefei 230026, Peoples R China 2.Chinese Acad Sci, Key Lab Opt Astron, Natl Astron Observ, Beijing 100101, Peoples R China 3.Chinese Acad Sci, Key Lab Radio Astron, Xinjiang Astron Observ, Urumqi 830011, Xinjiang, Peoples R China 4.Sun Yat Sen Univ, Sch Atmospher Sci, Planetary Environm & Astrobiol Res Lab PEARL, Zhuhai, Peoples R China 5.Univ Diego Portales, Fac Ingn & Ciencias, Inst Estudios Astrofis, Santiago, Chile 6.Chinese Acad Sci, Shanghai Astron Observ, 80 Nandan Rd, Shanghai 200030, Peoples R China 7.Chinese Acad Sci, Key Lab Planetary Sci, Purple Mt Observ, Nanjing 210023, Peoples R China |
| 推荐引用方式 GB/T 7714 | Li, Juncen,Shi, Xian,Shi, Jianchun,et al. Pre-perihelion radio observations of comet 12P/Pons-Brooks with the Tianma Radio Telescope[J]. ASTRONOMY & ASTROPHYSICS,2025,701:A204. |
| APA | Li, Juncen.,Shi, Xian.,Shi, Jianchun.,Ma, Yuehua.,Yang, Bin.,...&Zhao, Ruining.(2025).Pre-perihelion radio observations of comet 12P/Pons-Brooks with the Tianma Radio Telescope.ASTRONOMY & ASTROPHYSICS,701,A204. |
| MLA | Li, Juncen,et al."Pre-perihelion radio observations of comet 12P/Pons-Brooks with the Tianma Radio Telescope".ASTRONOMY & ASTROPHYSICS 701(2025):A204. |
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来源：新疆天文台
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