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Hα Absorption in Transiting Exoplanet Atmospheres
| Content Provider | Scilit |
|---|---|
| Author | Christie, Duncan Arras, Phil Li, Zhi-Yun |
| Copyright Year | 2012 |
| Description | Recent observations by Jensen et al. of Hα absorption by the upper atmosphere of HD189733b have motivated the need for a theoretical understanding of the distribution of n=2 hydrogen within hot Jupiter atmospheres. With this in mind, we model the n=2 state of atomic hydrogen in a hydrostatic atmosphere in thermal and photoionization equilibrium. Both collisional and radiative transitions are included in the calculation of the n = 2 state level population. In our model, the Hα absorption is dominated by a τ ~ 1 shell composed of metastable 2s hydrogen located within the neutral atomic layer, with the contribution coming roughly uniformly throughout the layer instead of from a specific impact parameter. An ionization rate an order of magnitude over the expected value can reproduce the observed transit depth. |
| Related Links | https://www.cambridge.org/core/services/aop-cambridge-core/content/view/B9874E4DEE6E19FA782EA6058E6005F5/S1743921313008594a.pdf/div-class-title-h-absorption-in-transiting-exoplanet-atmospheres-div.pdf |
| Ending Page | 282 |
| Page Count | 2 |
| Starting Page | 281 |
| ISSN | 17439213 |
| e-ISSN | 17439221 |
| DOI | 10.1017/s1743921313008594 |
| Journal | Proceedings of the International Astronomical Union |
| Issue Number | S299 |
| Volume Number | 8 |
| Language | English |
| Publisher | Cambridge University Press (CUP) |
| Publisher Date | 2013-06-01 |
| Access Restriction | Open |
| Subject Keyword | Proceedings of the International Astronomical Union Astronomy and Astrophysics Individual (hd 189733 Hd 209458) |
| Content Type | Text |
| Resource Type | Article |
| Subject | Astronomy and Astrophysics Space and Planetary Science |
