JCMT detection of HCN emission from 3I/ATLAS at 2.1 AU
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| Main Authors: | , , , , , , , , , , |
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| Format: | Preprint |
| Published: |
2025
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| _version_ | 1866912872724955136 |
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| author | Coulson, Iain M. Kuan, Yi-Jehng Charnley, Steven B. Cordiner, Martin A. Chuang, Yo-Ling Lee, Yueh-Ning Lin, Min-Kai Milam, Stefanie N. Pimpanuwat, Bannawit Roth, Nathan X. Żółtowski, Michał |
| author_facet | Coulson, Iain M. Kuan, Yi-Jehng Charnley, Steven B. Cordiner, Martin A. Chuang, Yo-Ling Lee, Yueh-Ning Lin, Min-Kai Milam, Stefanie N. Pimpanuwat, Bannawit Roth, Nathan X. Żółtowski, Michał |
| contents | We report the detection of HCN ($J=3-2$) rotational emission from comet 3I/ATLAS at a heliocentric distance of 2.13 AU with the James Clerk Maxwell Telescope (JCMT). Observations were conducted from 07 August 2025 and 14 September 2025 (UT) using the $^{\prime}\overline U^{\prime}\overline u$ heterodyne receiver and ACSIS spectroscopic backend. The HCN line was detected at $>6σ$ on 14 Sep 2025 (UT) and a production rate of $Q({\rm HCN})=(4.0\pm1.7)\times10^{25}\ {\rm s}^{-1}$ was derived by non-LTE radiative transfer modelling. Preliminary estimates of the HCN/H$_2$O and CN/HCN abundance ratios suggest values similar to Solar System comets. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2510_02817 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | JCMT detection of HCN emission from 3I/ATLAS at 2.1 AU Coulson, Iain M. Kuan, Yi-Jehng Charnley, Steven B. Cordiner, Martin A. Chuang, Yo-Ling Lee, Yueh-Ning Lin, Min-Kai Milam, Stefanie N. Pimpanuwat, Bannawit Roth, Nathan X. Żółtowski, Michał Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics We report the detection of HCN ($J=3-2$) rotational emission from comet 3I/ATLAS at a heliocentric distance of 2.13 AU with the James Clerk Maxwell Telescope (JCMT). Observations were conducted from 07 August 2025 and 14 September 2025 (UT) using the $^{\prime}\overline U^{\prime}\overline u$ heterodyne receiver and ACSIS spectroscopic backend. The HCN line was detected at $>6σ$ on 14 Sep 2025 (UT) and a production rate of $Q({\rm HCN})=(4.0\pm1.7)\times10^{25}\ {\rm s}^{-1}$ was derived by non-LTE radiative transfer modelling. Preliminary estimates of the HCN/H$_2$O and CN/HCN abundance ratios suggest values similar to Solar System comets. |
| title | JCMT detection of HCN emission from 3I/ATLAS at 2.1 AU |
| topic | Earth and Planetary Astrophysics Astrophysics of Galaxies Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2510.02817 |