2021A&A...656A.142K


Query : 2021A&A...656A.142K

2021A&A...656A.142K - Astronomy and Astrophysics, volume 656A, 142-142 (2021/12-1)

Probing the atmosphere of WASP-69 b with low- and high-resolution transmission spectroscopy.

KHALAFINEJAD S., MOLAVERDIKHANI K., BLECIC J., MALLONN M., NORTMANN L., CABALLERO J.A., RAHMATI H., KAMINSKI A., SADEGI S., NAGEL E., CARONE L., AMADO P.J., AZZARO M., BAUER F.F., CASASAYAS-BARRIS N., CZESLA S., VON ESSEN C., FOSSATI L., GUDEL M., HENNING T., LOPEZ-PUERTAS M., LENDL M., LUFTINGER T., MONTES D., OSHAGH M., PALLE E., QUIRRENBACH A., REFFERT S., REINERS A., RIBAS I., STOCK S., YAN F., ZAPATERO OSORIO M.R. and ZECHMEISTER M.

Abstract (from CDS):

Consideration of both low- and high-resolution transmission spectroscopy is key for obtaining a comprehensive picture of exoplanet atmospheres.In studies of transmission spectra, the continuum information is well established with low-resolution spectra, while the shapes of individual lines are best constrained with high-resolution observations.In this work, we aim to merge high- with low-resolution transmission spectroscopy to place tighter constraints on physical parameters of the atmospheres. We present the analysis of three primary transits of WASP-69 b in the visible (VIS) channel of the CARMENES instrument and perform a combined low- and high-resolution analysis using additional data from HARPS-N, OSIRIS/GTC, and WFC3/HST already available in the literature. We investigate the NaI D1 and D2 doublet, Hα, the CaII infra-red triplet (IRT), and KIλ7699 Å lines, and we monitor the stellar photometric variability by performing long-term photometric observations with the STELLA telescope. During the first CARMENES observing night, we detected the planet NaI D2 and D1 lines at ∼7 and ∼3σ significance levels, respectively. We measured a D2/D1 intensity ratio of 2.5 ± 0.7, which is in agreement with previous HARPS-N observations. Our modelling of WFC3 and OSIRIS data suggests strong Rayleigh scattering, solar to super-solar water abundance, and a highly muted Na feature in the atmosphere of this planet, in agreement with previous investigations of this target. We use the continuum information retrieved from the low-resolution spectroscopy as a prior to break the degeneracy between the Na abundance, reference pressure, and thermosphere temperature for the high-resolution spectroscopic analysis. We fit the NaI D1 and D2 lines individually and find that the posterior distributions of the model parameters agree with each other within 1σ. Our results suggest that local thermodynamic equilibrium processes can explain the observed D2/D1 ratio because the presence of haze opacity mutes the absorption features.

Abstract Copyright: © ESO 2021

Journal keyword(s): methods: observational - techniques: spectroscopic - planets and satellites: atmospheres - planets and satellites: composition - planets and satellites: individual: WASP-69 b - stars: activity

Simbad objects: 8

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Number of rows : 8
N Identifier Otype ICRS (J2000)
RA
ICRS (J2000)
DEC
Mag U Mag B Mag V Mag R Mag I Sp type #ref
1850 - 2023
#notes
1 HAT-P-32b Pl 02 04 10.2775457769 +46 41 16.210382751           ~ 127 1
2 NAME LP 424-4b Pl 07 59 05.8395618539 +15 23 29.240025256           ~ 259 1
3 BD-03 2978b Pl 10 42 14.0835894932 -03 50 06.259823354           ~ 71 0
4 WASP-39b Pl 14 29 18.4151765921 -03 26 40.203046112           ~ 133 1
5 WASP-189b Pl? 15 02 44.8679915475 -03 01 52.986005307           ~ 54 0
6 HD 189733b Pl 20 00 43.7130382888 +22 42 39.071811263           ~ 1323 1
7 BD-05 5432 PM* 21 00 06.1968214728 -05 05 40.034944176   10.93 9.87     ~ 53 1
8 BD-05 5432b Pl 21 00 06.1969250596 -05 05 40.037007561           ~ 108 1

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2023.01.31-01:16:08

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