The PEPSI Exoplanet Transit Survey (PETS) -V. New Na D transmission spectra indicate a quieter atmosphere on HD 189733b
Date Issued
2024
Author(s)
Keles, E.
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Czesla, S.
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Poppenhaeger, K.
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Hauschildt, P.
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Carroll, T. A.
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Ilyin, I.
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Baratella, M.
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Steffen, M.
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Strassmeier, K. G.
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Gaudi, B. S.
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Henning, T.
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Johnson, M. C.
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Molaverdikhani, K.
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Patience, J.
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Reiners, A.
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Schlawin, E.
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Shkolnik, E.
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•
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Mallonn, M.
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Veillet, C.
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Wang, J.
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Yan, F.
Abstract
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 analyse the transmission spectrum around the Na D lines. We model the spectral signature of the RM-CL V -effect using synthetic PHOENIX spectra based on spherical LTE atmospheric models. We find an 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-1 and a moderate super-rotational streaming wind in the order of 3-4 km s-1, challenging claims of pre v ailing strong winds on HD 189733b.
Volume
530
Issue
4
Start page
4826
Issn Identifier
0035-8711
Rights
open.access
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