Modeling Circumstellar Gas Emission around a White Dwarf Using Cloudy
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arXiv
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| Main Authors: | , , , , , , , , , , , |
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| Format: | Preprint |
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2024
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| _version_ | 1866911810758639616 |
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| author | Xu, Siyi Yeh, Sherry Rogers, Laura. K. Steele, Amy Dennihy, Erik Doyle, Alexandra E. Dufour, P. Klein, Beth L. Manser, Christopher J. Melis, Carl Wang, Tinggui Weinberger, Alycia J. |
| author_facet | Xu, Siyi Yeh, Sherry Rogers, Laura. K. Steele, Amy Dennihy, Erik Doyle, Alexandra E. Dufour, P. Klein, Beth L. Manser, Christopher J. Melis, Carl Wang, Tinggui Weinberger, Alycia J. |
| contents | The chemical composition of an extrasolar planet is fundamental to its formation, evolution and habitability. In this study, we explore a new way to measure the chemical composition of the building blocks of extrasolar planets, by measuring the gas composition of the disrupted planetesimals around white dwarf stars. As a first attempt, we used the photo-ionization code Cloudy to model the circumstellar gas emission around a white dwarf Gaia J0611$-$6931 under some simplified assumptions. We found most of the emission lines are saturated and the line ratios approaching the ratios of thermal emission; therefore only lower limits to the number density can be derived. Silicon is the best constrained element in the circumstellar gas and we derived a lower limit of 10$^{10.3}$ cm$^{-3}$. In addition, we placed a lower limit on the total amount of gas to be 1.8 $\times$ 10$^{19}$ g. Further study is needed to better constrain the parameters of the gas disk and connect it to other white dwarfs with circumstellar gas absorption. |
| format | Preprint |
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arxiv_https___arxiv_org_abs_2403_15794 |
| institution | arXiv |
| publishDate | 2024 |
| record_format | arxiv |
| spellingShingle | Modeling Circumstellar Gas Emission around a White Dwarf Using Cloudy Xu, Siyi Yeh, Sherry Rogers, Laura. K. Steele, Amy Dennihy, Erik Doyle, Alexandra E. Dufour, P. Klein, Beth L. Manser, Christopher J. Melis, Carl Wang, Tinggui Weinberger, Alycia J. Earth and Planetary Astrophysics Solar and Stellar Astrophysics The chemical composition of an extrasolar planet is fundamental to its formation, evolution and habitability. In this study, we explore a new way to measure the chemical composition of the building blocks of extrasolar planets, by measuring the gas composition of the disrupted planetesimals around white dwarf stars. As a first attempt, we used the photo-ionization code Cloudy to model the circumstellar gas emission around a white dwarf Gaia J0611$-$6931 under some simplified assumptions. We found most of the emission lines are saturated and the line ratios approaching the ratios of thermal emission; therefore only lower limits to the number density can be derived. Silicon is the best constrained element in the circumstellar gas and we derived a lower limit of 10$^{10.3}$ cm$^{-3}$. In addition, we placed a lower limit on the total amount of gas to be 1.8 $\times$ 10$^{19}$ g. Further study is needed to better constrain the parameters of the gas disk and connect it to other white dwarfs with circumstellar gas absorption. |
| title | Modeling Circumstellar Gas Emission around a White Dwarf Using Cloudy |
| topic | Earth and Planetary Astrophysics Solar and Stellar Astrophysics |
| url | https://arxiv.org/abs/2403.15794 |