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| Format: | Preprint |
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2025
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| Online-Zugang: | https://arxiv.org/abs/2503.18128 |
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| _version_ | 1866912467613908992 |
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| author | Hardy, P. Rousselot, P. Richard, C. Boudon, V. Landsheere, X. Voute, A. Manceron, L. Tchana, F. Kwabia |
| author_facet | Hardy, P. Rousselot, P. Richard, C. Boudon, V. Landsheere, X. Voute, A. Manceron, L. Tchana, F. Kwabia |
| contents | Cyanogen ($\mathrm{C_2N_2}$) is suspected for a long time to be present in comets and to contribute to the creation of the CN radical. So far no observations with ground-based facilities have managed to detect this species but the Rosetta mission, thanks to in situ observations with the ROSINA mass spectrometer detected this species in the coma of 67P/Churyumov-Gerasimenko. To investigate its presence from infrared spectra in other comets, we developed a fluorescence model for the $ν_3$ fundamental band. From new laboratory high-resolution infrared spectra of cyanogen, we analyzed the region of the $ν_3$ band of $\mathrm{C_2N_2}$, centered around 4.63 $μm$ (2158 $\mathrm{cm^{-1}}$). In addition to line positions and intensities, molecular parameters for the ground and excited vibrational state were obtained. These parameters allowed us to develop a fluorescence model for cyanogen. Line-by-line excitation rates of the $ν_3$ band of cyanogen in cometary comae are presented. An upper limit of the abundance of cyanogen in a spectrum of comet C/2022 E3 (ZTF) is discussed. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2503_18128 |
| institution | arXiv |
| publishDate | 2025 |
| record_format | arxiv |
| spellingShingle | A cometary Fluorescence Model for the $ν_3$ Vibrational Band of Cyanogen Hardy, P. Rousselot, P. Richard, C. Boudon, V. Landsheere, X. Voute, A. Manceron, L. Tchana, F. Kwabia Earth and Planetary Astrophysics Cyanogen ($\mathrm{C_2N_2}$) is suspected for a long time to be present in comets and to contribute to the creation of the CN radical. So far no observations with ground-based facilities have managed to detect this species but the Rosetta mission, thanks to in situ observations with the ROSINA mass spectrometer detected this species in the coma of 67P/Churyumov-Gerasimenko. To investigate its presence from infrared spectra in other comets, we developed a fluorescence model for the $ν_3$ fundamental band. From new laboratory high-resolution infrared spectra of cyanogen, we analyzed the region of the $ν_3$ band of $\mathrm{C_2N_2}$, centered around 4.63 $μm$ (2158 $\mathrm{cm^{-1}}$). In addition to line positions and intensities, molecular parameters for the ground and excited vibrational state were obtained. These parameters allowed us to develop a fluorescence model for cyanogen. Line-by-line excitation rates of the $ν_3$ band of cyanogen in cometary comae are presented. An upper limit of the abundance of cyanogen in a spectrum of comet C/2022 E3 (ZTF) is discussed. |
| title | A cometary Fluorescence Model for the $ν_3$ Vibrational Band of Cyanogen |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2503.18128 |