Ferdinand, Raymon (2025) Deriving the C/O Ratio in the Outer Regions of PDS-70 Using ProDiMo. Master's Thesis / Essay, Astronomy.
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Abstract
PDS-70 is a unique case study for planet formation because two young, accreting exoplanets have been directly imaged within. Recent models of the PDS-70 disk do not fully encompass all of the observed gas. In this work, a radial extension (> 120 AU) is made of the gas component of an existing model of PDS-70, with the aim of finding the gas C/O ratio, an important ratio for planet formation, in the disk’s outer regions. Our model favors a C/O ≫ 1, with a C/O of 5 matching observations within 80 AU. This is different from a similar study which found a C/O of 1.01 due to our model containing much less C2H than theirs. Carbon atoms seem to favor molecules with longer chains (more than two C-atoms). Beyond 80 AU, the C2H abundance increase is much slower, implying an even higher C/O ratio. An inclusion of non-uniform C/O ratios in the disk model model may be needed to account for this. Higher C/O ratios were not modeled because the C18O fit is destroyed by raising the C/O to this level. In the future, an inclusion of the C/O ratio as a free parameter in the iterative process is needed to obtain consistent fits for both C18O and C2H. Future models may also need to vary the dust abundance, as this may also affect the gas emission.
| Item Type: | Thesis (Master's Thesis / Essay) |
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| Supervisor name: | Kamp, I.E.E. |
| Degree programme: | Astronomy |
| Thesis type: | Master's Thesis / Essay |
| Language: | English |
| Date Deposited: | 22 Aug 2025 08:02 |
| Last Modified: | 22 Aug 2025 08:02 |
| URI: | https://fse.studenttheses.ub.rug.nl/id/eprint/36808 |
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