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Update 4/27
Charge Exchange
Here's the split of absorption between hot and cold neutrals:
Shows pretty much what the theoretical calculation does - the hot neutral density just isn't high enough to get significant absorption. You can see a lot more broadening in the hot case, the total absorption is just very low compared to the cold.
Papers
| Study | Fluids | Planet | Resolution | Stellar wind density (/cm3) | Stellar wind velocity (cm/s) | Stellar wind temperature (K) | Stellar Wind Mass Loss (g/s) | Results |
| Ours | Single (4 species tracers) | HD 209458b, self-consistent | 3D, ~0.01 Rp | 7x102, 4x104 | 1.3x107 | 8x105 | 1.6x109, 8.2x1010 | A few percent absorption |
| Khodachenko et al 2019 | Multifluid (H2, H2+, H3+, HeI+II, HI+II, e-) | GJ 436b, self-consistent | 3D, ~0.5 Rp in tail | 1.2-8x103 | 4x107 | 6x105 | 7.5x1010-5x1011 | ~50% blue absorption from parameter set #11 of table 2 |
| Khodachenko et al 2017 | Multifluid (H2, H2+, H3+, HeI+II, HI+II (stellar and planetary), e-) | HD 209458b, self-consistent | 2D, ? | 5x103-3x104 | 2-5x107 | 1-3x106 | Fig 9 - absorption of a few percent by hot neutrals | |
| Shaikhislamov et al 2016 | Multifluid (H2, H2+, H3+, HI+II (stellar and planetary), e-) | HD 209458b, self-consistent | 2D, | 1.3x102-3.4x103 | 2.3-6.6x107 | 0.9-2.9x106 | Hot neutrals ~10x lower than required to create observed absorption (max column density ~1011 at -100 km/s) | |
| Bourrier et al 2016 | Particle model | GJ 436b (4 Rp) | 3D | 1.3,3.3x103 (Best-fit values) | 8.5x106 (Best-fit) | 1.2x104 (Best-fit) | Good fit to observations | |
| Christie et al 2016 | Single-fluid | HD 209458b (Rp) | 2D, cyl, ~0.05 Rp | 104 | 2x107 | 106 | Absorption of a few percent | |
| Tremblin & Chiang 2013 | Single-fluid? | HD 209458b (4 Rp) | 2D, 0.00625 Rp | 2.9x104 | 1.3x107 | 106 | 1012 | Absorption of ~10% |
Summary: After reviewing all of the papers, it's starting to look like everyone can fit GJ 436 but not HD 209458.
(Not sure why only the first attachment link is working…. Open post to download attachments.)
Spring code
Basically done. A few more problems to update, some minor refactoring and upgrades for the spring part (particularly, need to figure out the correct places to parallelize with OpenMP).
Attachments (6)
- Khodachenko 2019 GJ436b model.pdf (1.8 MB) - added by 5 years ago.
- Khodachenko ea 2017 RadPress.pdf (3.1 MB) - added by 5 years ago.
- Bourrier ea 2016 GJ436b.pdf (3.7 MB) - added by 5 years ago.
- Shaikhislamov ea 2016 NegRadPress.pdf (4.3 MB) - added by 5 years ago.
- Christie ea 2016 Axisym ChrgExch.pdf (7.4 MB) - added by 5 years ago.
- Tremblin&Chiang ChrgExch.pdf (3.0 MB) - added by 5 years ago.
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