  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.
