2024MNRAS.530.4826K

Query : 2024MNRAS.530.4826K

2024MNRAS.530.4826K - Mon. Not. R. Astron. Soc., 530, 4826-4838 (2024/June-1)

The PEPSI Exoplanet Transit Survey (PETS) - V. New Na D transmission spectra indicate a quieter atmosphere on HD 189733b.

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. and YAN F.

Abstract (from CDS):

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-CLV-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 prevailing strong winds on HD 189733b.

Abstract Copyright: © 2024 The Author(s). Published by Oxford University Press on behalf of Royal Astronomical Society.

Journal keyword(s): planets and satellites: gaseous planets - planets and satellites: atmospheres - techniques: spectroscopic - line: profiles - stars: activity

Simbad objects: 4

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Number of rows : 4
N Identifier Otype ICRS (J2000)
RA 		ICRS (J2000)
DEC 		Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2026 		#notes
1 HD 189733 BY* 20 00 43.7129433648 +22 42 39.073143456 9.241 8.578 7.648 7.126 6.68 K2V 991 1
2 HD 189733b Pl 20 00 43.7129433648 +22 42 39.073143456           ~ 1610 1
3 HD 201585b Pl 21 10 12.3723073896 +10 44 19.949472816           ~ 83 0
4 HD 209458b Pl 22 03 10.7727465312 +18 53 03.549393384           ~ 2037 1

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