학술논문
The PEPSI Exoplanet Transit Survey (PETS). V: New Na D transmission spectra indicate a quieter atmosphere on HD 189733b
Document Type
Working Paper
Author
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.
Source
Subject
Language
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 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
Comment: Accepted for publication in Monthly Notices of the Royal Astronomical Society