The PEPSI Exoplanet Transit Survey (PETS). V: New Na D transmission spectra indicate a quieter atmosphere on HD 189733b
| Autor: | Keles, E., Czesla, S., Poppenhaeger, K., Hauschildt, P., Carroll, T. A., Ilyin, I., Baratella, M., Steffen, M., Strassmeier, K. G., Bonomo, A. S., Gaudi, B. S., Henning, T., Johnson, M. C., Molaverdikhani, K., Nascimbeni, V., Patience, J., Reiners, A., Scandariato, G., Schlawin, E., Shkolnik, E., Sicilia, D., Sozzetti, A., Mallonn, M., Veillet, C., Wang, J., Yan, F. |
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| Rok vydání: | 2024 |
| Předmět: | |
| Druh dokumentu: | Working Paper |
| Popis: | Absorption lines from exoplanet atmospheres observed in transmission allow us to study atmospheric characteristics such as winds. We present a new high-resolution transit time-series of HD 189733b, acquired with the PEPSI instrument at the LBT and analyze the transmission spectrum around the Na D lines. We model the spectral signature of the RM-CLV-effect using synthetic PHOENIX spectra based on spherical LTE atmospheric models. We find a Na D absorption signature between the second and third contact but not during the ingress and egress phases, which casts doubt on the planetary origin of the signal. Presupposing a planetary origin of the signal, the results suggest a weak day-to-nightside streaming wind in the order of 0.7 km/s and a moderate super-rotational streaming wind in the order of 3 - 4 km/s, challenging claims of prevailing strong winds on HD 189733b. Comment: Accepted for publication in Monthly Notices of the Royal Astronomical Society |
| Databáze: | arXiv |
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