English (United Kingdom)

https://curated-unify.zendy.io/wp-json/zendy-region/v1/featured_content/oa?rat=en

https://curated-unify.zendy.io/wp-json/zendy-region/v1/highlighted_journal/

Global: Zendy Plus annual

Presents the access of premium content as premium feature

Premium Content

Presents the keyphrase highlighting as premium feature

Keyphrase Highlighting

Presents the summarisation as premium feature

Summarisation

Insights

Presents the pdf analysis as premium feature

PDF Analysis

Presents the zaia usage as premium feature

ZAIA

Global: Zendy Plus monthly

Global: Zendy Tools annual

Global: Zendy Tools monthly

Global: Zendy Free Plan

Infrared spectroscopy over a wide spectral range and at the highest resolvingpowers (R>70 000) has proved to be one of the leading technique to unveil theatmospheric composition of dozens of exoplanets. The recently upgradedspectrograph CRIRES instrument at the VLT (CRIRES+) was operative for a firstScience Verification in September 2021 and its new capabilities in atmosphericcharacterisation were ready to be tested. We analysed transmission spectra ofthe Hot Saturn WASP-20b in the K-band (1981-2394 nm) acquired with CRIRES+,aiming at detecting the signature of H2O and CO. We used Principal ComponentAnalysis to remove the dominant time-dependent contaminating sources such astelluric bands and the stellar spectrum and we extracted the planet spectrum bycross-correlating observations with 1D and 3D synthetic spectra, with nocirculation included. We present the tentative detection of molecularabsorption from water-vapour at S/N equal to 4.2 and 4.7 by using only-H2O 1Dand 3D models, respectively. The peak of the CCF occurred at the samerest-frame velocity for both model types (Vrest=-1 $\pm$ 1 kms$^{-1}$), and atthe same projected planet orbital velocity but with different error bands (1Dmodel: KP=131$^{+18}_{-29}$ kms$^{-1}$; 3D: KP=131$^{+23}_{-39}$ kms$^{-1}$).Our results are in agreement with the one expected in literature (132.9 $\pm$2.7 kms$^{-1}$). Although sub-optimal observational conditions and issues withpipeline in calibrating and reducing our raw data set, we obtained the firsttentative detection of water in the atmosphere of WASP-20b. We suggest a deeperanalysis and additional observations to confirm our results and unveil thepresence of CO.

Detecting H$_2$O with CRIRES+: the case of WASP-20b