The PEPSI Exoplanet Transit Survey (PETS). V: New Na D transmission spectra indicate a quieter atmosphere on HD 189733b
2024
Online
report
Zugriff:
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
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The PEPSI Exoplanet Transit Survey (PETS). V: New Na D transmission spectra indicate a quieter atmosphere on HD 189733b
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Autor/in / Beteiligte Person: | 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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Veröffentlichung: | 2024 |
Medientyp: | report |
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