Perihelion Asymmetry in the Water Production Rate of the Interstellar Object 3I/ATLAS
文献类型：期刊论文
| 作者 | Tan, Hanjie3; Yan, Xiaoran2; Li, Jian-Yang1,3 |
| 刊名 | ASTROPHYSICAL JOURNAL LETTERS
 |
| 出版日期 | 2026-02-10 |
| 卷号 | 998期号:1页码:10 |
| ISSN号 | 2041-8205 |
| DOI | 10.3847/2041-8213/ae3c97 |
| 通讯作者 | Yan, Xiaoran(yanxr159@gmail.com) |
| 英文摘要 | 3I/ATLAS is an interstellar object whose activity provides critical insights into its composition and origin. However, due to its orbital geometry, the object is too close to the Sun near perihelion to be observed from the ground, and space-based measurements are therefore required. Here we characterize the water production rate of 3I/ATLAS using Solar and Heliospheric Observatory/SWAN Ly alpha observations from 2025 November to December (heliocentric distances 1.4-2.2 au) with 3D Monte Carlo modeling. We report a peak postperihelion water production rate of QH2O approximate to 4x1028 molecules s-1, corresponding to a minimum active fraction of similar to 30% (assuming a maximum nucleus radius of 2.8 km). Comparison of our postperihelion measurements with published preperihelion results reveals a heliocentric asymmetry, with an r-5.9 +/- 0.8 scaling for the inbound rise, followed by a shallower r-3.3 +/- 0.3 scaling during the outbound decline, where r is heliocentric distance. The postperihelion behavior indicates that the water production of 3I/ATLAS was driven primarily by the varying solar insolation acting on a stable active area. Combined with other evidence, including comparison with the hyperactive comet 103P/Hartley 2, our findings suggest that its water production is likely dominated by a distributed source of icy grains. Furthermore, it displayed remarkable stability in the activity with no signs of outbursts or rapid depletion of water production. |
| WOS关键词 | PARTICLE-TRAJECTORY MODELS ; LYMAN-ALPHA OBSERVATIONS ; NEUTRAL COMETARY GASES ; C/2020 F3 NEOWISE ; SOHO/SWAN OBSERVATIONS ; LY-ALPHA ; SWAN ; SOHO ; ASTROPY ; 67P/CHURYUMOV-GERASIMENKO |
| 资助项目 | (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) divided by Natural Science Foundation of Xinjiang Uygur Autonomous Region (Xinjiang Natural Science Foundation)[2025D01E62] |
| WOS研究方向 | Astronomy & Astrophysics |
| 语种 | 英语 |
| WOS记录号 | WOS:001682153500001 |
| 出版者 | IOP Publishing Ltd |
| 资助机构 | (sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic)(sic) divided by Natural Science Foundation of Xinjiang Uygur Autonomous Region (Xinjiang Natural Science Foundation) |
| 源URL | [http://ir.xao.ac.cn/handle/45760611-7/8543]  |
| 专题 | 研究单元未命名 |
| 通讯作者 | Yan, Xiaoran |
| 作者单位 | 1.Chinese Acad Sci, Xinjiang Astron Observ, Urumqi, Peoples R China 2.Inst Appl Phys Nello Carrara IFAC CNR, Natl Res Council, I-50019 Sesto, FI, Italy 3.Sun Yat sen Univ, Sch Atmospher Sci, Planetary Environm & Astrobiol Res Lab PEARL, Zhuhai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Tan, Hanjie,Yan, Xiaoran,Li, Jian-Yang. Perihelion Asymmetry in the Water Production Rate of the Interstellar Object 3I/ATLAS[J]. ASTROPHYSICAL JOURNAL LETTERS,2026,998(1):10. |
| APA | Tan, Hanjie,Yan, Xiaoran,&Li, Jian-Yang.(2026).Perihelion Asymmetry in the Water Production Rate of the Interstellar Object 3I/ATLAS.ASTROPHYSICAL JOURNAL LETTERS,998(1),10. |
| MLA | Tan, Hanjie,et al."Perihelion Asymmetry in the Water Production Rate of the Interstellar Object 3I/ATLAS".ASTROPHYSICAL JOURNAL LETTERS 998.1(2026):10. |
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