Dust and Volatiles in the Disintegrating Comet C/2019 Y4 (ATLAS)
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arXiv
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2024
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| author | Zhao, Ruining Li, Aigen Yang, Bin Wang, Liang Wang, Huijuan Liu, Yu-Juan Liu, Jifeng |
| author_facet | Zhao, Ruining Li, Aigen Yang, Bin Wang, Liang Wang, Huijuan Liu, Yu-Juan Liu, Jifeng |
| contents | C/2019 Y4 (ATLAS) is an Oort cloud comet with an orbital period of $\sim$5895$\,{\rm yr}$. Starting in March 2020, its nucleus underwent disintegration. In order to investigate the gas and dust properties of C/2019 Y4 (ATLAS) during its disintegration, we obtained long-slit spectra at 3600--8700$\,{\rm\mathring{A}}$ and $BVRI$ multi-band images with the Xinglong 2.16-Meter Telescope in April 2020. Our observations revealed that C/2019 Y4 (ATLAS) exhibited strong emission bands of CN, C$_2$, C$_3$, and NH$_2$ which are superimposed on a dust scattering continuum, typical of cometary spectra in the optical. The production rates of CN, C$_2$, and C$_3$ derived using the Haser model and the corresponding C$_2$/CN and C$_3$/CN ratios suggest that C/2019 Y4 (ATLAS) is a ``typical'' Oort cloud comet under the A'Hearn classification, although it appears less dusty as revealed by the $Afρ$ quantities. Its dust-scattering reflectivity is slightly red, with a gradient of $\sim$5% per $10^3\,{\rm\mathring{A}}$. We model the reflectivity gradient in terms of porous dust and find that the red color is accounted for by porous dust. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2401_02073 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Dust and Volatiles in the Disintegrating Comet C/2019 Y4 (ATLAS) Zhao, Ruining Li, Aigen Yang, Bin Wang, Liang Wang, Huijuan Liu, Yu-Juan Liu, Jifeng Earth and Planetary Astrophysics C/2019 Y4 (ATLAS) is an Oort cloud comet with an orbital period of $\sim$5895$\,{\rm yr}$. Starting in March 2020, its nucleus underwent disintegration. In order to investigate the gas and dust properties of C/2019 Y4 (ATLAS) during its disintegration, we obtained long-slit spectra at 3600--8700$\,{\rm\mathring{A}}$ and $BVRI$ multi-band images with the Xinglong 2.16-Meter Telescope in April 2020. Our observations revealed that C/2019 Y4 (ATLAS) exhibited strong emission bands of CN, C$_2$, C$_3$, and NH$_2$ which are superimposed on a dust scattering continuum, typical of cometary spectra in the optical. The production rates of CN, C$_2$, and C$_3$ derived using the Haser model and the corresponding C$_2$/CN and C$_3$/CN ratios suggest that C/2019 Y4 (ATLAS) is a ``typical'' Oort cloud comet under the A'Hearn classification, although it appears less dusty as revealed by the $Afρ$ quantities. Its dust-scattering reflectivity is slightly red, with a gradient of $\sim$5% per $10^3\,{\rm\mathring{A}}$. We model the reflectivity gradient in terms of porous dust and find that the red color is accounted for by porous dust. |
| title | Dust and Volatiles in the Disintegrating Comet C/2019 Y4 (ATLAS) |
| topic | Earth and Planetary Astrophysics |
| url | https://arxiv.org/abs/2401.02073 |