Europlanet Science Congress 2022
Palacio de Congresos de Granada, Spain
18 – 23 September 2022
Europlanet Science Congress 2022
Palacio de Congresos de Granada, Spain
18 September – 23 September 2022
EPSC Abstracts
Vol. 16, EPSC2022-325, 2022
Europlanet Science Congress 2022
© Author(s) 2022. This work is distributed under
the Creative Commons Attribution 4.0 License.

The rich chemistry of two warm-giant planets 

Gloria Guilluy1, Ilaria Carleo2,3, Paolo Giacobbe1, Alessandro Sozzetti1, and Aldo Bonomo1
Gloria Guilluy et al.
  • 1Osservatorio Astrofisico di Torino (INAF), Italy (
  • 2Instituto de Astrofísica de Canarias C/ Via Láctea s/n 35205, La Laguna, Santa Cruz de Tenerife
  • 3Osservatorio Astronomico di Padova, Vicolo dell'Osservatorio 5, I-35122 Padova (INAF), Italy

High-resolution (HR) ground-based spectrographs have drastically improved the investigation of exoplanet atmospheres. In this scenario the near-infrared (0.9-2.45 μm) HR (R /sim 50000) spectrograph GIANO-B mounted at the Nasmyth-B focus of the Telescopio Nazionale Galileo (TNG) telescope is playing an important role.

With the simultaneous detection of six molecules in the atmosphere of the Hot-Jupiter HD 209458b, we have recently demonstrated (Giacobbe+2021) that exoplanetary atmospheres can show a chemical richness previously unknown -as only a few molecules had been previously detected in an exoplanetary atmosphere.  Thus, the question of whether the complexity of HD 209458b’s atmosphere is unique or other exo-atmospheres can also show such a rich molecular composition arises spontaneously.

Here we report on transmission spectroscopy observations of two warm-giant planets, namely WASP-69b, and WASP-80b, gathered within the GAPS large program aimed at detecting atomic and molecular species in exoplanet atmospheres and possibly constraining the planetary C/O ratio, which is thought to be linked to planet migration and formation mechanisms.

We present the simultaneous detection of multiple molecules in the atmosphere of each of the investigated exoplanets -thus unveiling chemical richness also in warm Jupiters for the first time- and interpret the results in terms of possible scenarios of atmospheric composition (C/O ratio, metallicity). 

The analysis presented here, together with Giacobbe+ 2021, opens a new frontier in the characterization of exoplanetary atmospheres, and additional surprising discoveries are expected with both ground-based HR spectrographs, such as CRIRES+, SPIRou, and NIRPS, and the low-resolution (LR) spectrographs on board the JWST telescope.

How to cite: Guilluy, G., Carleo, I., Giacobbe, P., Sozzetti, A., and Bonomo, A.: The rich chemistry of two warm-giant planets , Europlanet Science Congress 2022, Granada, Spain, 18–23 Sep 2022, EPSC2022-325,, 2022.


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